CVE-2024-26725 (GCVE-0-2024-26725)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:55 – Updated: 2026-05-11 20:02
VLAI
Title
dpll: fix possible deadlock during netlink dump operation
Summary
In the Linux kernel, the following vulnerability has been resolved: dpll: fix possible deadlock during netlink dump operation Recently, I've been hitting following deadlock warning during dpll pin dump: [52804.637962] ====================================================== [52804.638536] WARNING: possible circular locking dependency detected [52804.639111] 6.8.0-rc2jiri+ #1 Not tainted [52804.639529] ------------------------------------------------------ [52804.640104] python3/2984 is trying to acquire lock: [52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780 [52804.641417] but task is already holding lock: [52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20 [52804.642747] which lock already depends on the new lock. [52804.643551] the existing dependency chain (in reverse order) is: [52804.644259] -> #1 (dpll_lock){+.+.}-{3:3}: [52804.644836] lock_acquire+0x174/0x3e0 [52804.645271] __mutex_lock+0x119/0x1150 [52804.645723] dpll_lock_dumpit+0x13/0x20 [52804.646169] genl_start+0x266/0x320 [52804.646578] __netlink_dump_start+0x321/0x450 [52804.647056] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.647575] genl_rcv_msg+0x1ed/0x3b0 [52804.648001] netlink_rcv_skb+0xdc/0x210 [52804.648440] genl_rcv+0x24/0x40 [52804.648831] netlink_unicast+0x2f1/0x490 [52804.649290] netlink_sendmsg+0x36d/0x660 [52804.649742] __sock_sendmsg+0x73/0xc0 [52804.650165] __sys_sendto+0x184/0x210 [52804.650597] __x64_sys_sendto+0x72/0x80 [52804.651045] do_syscall_64+0x6f/0x140 [52804.651474] entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.652001] -> #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}: [52804.652650] check_prev_add+0x1ae/0x1280 [52804.653107] __lock_acquire+0x1ed3/0x29a0 [52804.653559] lock_acquire+0x174/0x3e0 [52804.653984] __mutex_lock+0x119/0x1150 [52804.654423] netlink_dump+0xb3/0x780 [52804.654845] __netlink_dump_start+0x389/0x450 [52804.655321] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.655842] genl_rcv_msg+0x1ed/0x3b0 [52804.656272] netlink_rcv_skb+0xdc/0x210 [52804.656721] genl_rcv+0x24/0x40 [52804.657119] netlink_unicast+0x2f1/0x490 [52804.657570] netlink_sendmsg+0x36d/0x660 [52804.658022] __sock_sendmsg+0x73/0xc0 [52804.658450] __sys_sendto+0x184/0x210 [52804.658877] __x64_sys_sendto+0x72/0x80 [52804.659322] do_syscall_64+0x6f/0x140 [52804.659752] entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.660281] other info that might help us debug this: [52804.661077] Possible unsafe locking scenario: [52804.661671] CPU0 CPU1 [52804.662129] ---- ---- [52804.662577] lock(dpll_lock); [52804.662924] lock(nlk_cb_mutex-GENERIC); [52804.663538] lock(dpll_lock); [52804.664073] lock(nlk_cb_mutex-GENERIC); [52804.664490] The issue as follows: __netlink_dump_start() calls control->start(cb) with nlk->cb_mutex held. In control->start(cb) the dpll_lock is taken. Then nlk->cb_mutex is released and taken again in netlink_dump(), while dpll_lock still being held. That leads to ABBA deadlock when another CPU races with the same operation. Fix this by moving dpll_lock taking into dumpit() callback which ensures correct lock taking order.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:52 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc , < 087739cbd0d0b87b6cec2c0799436ac66e24acc8 (git)
Affected: 9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc , < 53c0441dd2c44ee93fddb5473885fd41e4bc2361 (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix possible deadlock during netlink dump operation\n\nRecently, I\u0027ve been hitting following deadlock warning during dpll pin\ndump:\n\n[52804.637962] ======================================================\n[52804.638536] WARNING: possible circular locking dependency detected\n[52804.639111] 6.8.0-rc2jiri+ #1 Not tainted\n[52804.639529] ------------------------------------------------------\n[52804.640104] python3/2984 is trying to acquire lock:\n[52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780\n[52804.641417]\n               but task is already holding lock:\n[52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20\n[52804.642747]\n               which lock already depends on the new lock.\n\n[52804.643551]\n               the existing dependency chain (in reverse order) is:\n[52804.644259]\n               -\u003e #1 (dpll_lock){+.+.}-{3:3}:\n[52804.644836]        lock_acquire+0x174/0x3e0\n[52804.645271]        __mutex_lock+0x119/0x1150\n[52804.645723]        dpll_lock_dumpit+0x13/0x20\n[52804.646169]        genl_start+0x266/0x320\n[52804.646578]        __netlink_dump_start+0x321/0x450\n[52804.647056]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.647575]        genl_rcv_msg+0x1ed/0x3b0\n[52804.648001]        netlink_rcv_skb+0xdc/0x210\n[52804.648440]        genl_rcv+0x24/0x40\n[52804.648831]        netlink_unicast+0x2f1/0x490\n[52804.649290]        netlink_sendmsg+0x36d/0x660\n[52804.649742]        __sock_sendmsg+0x73/0xc0\n[52804.650165]        __sys_sendto+0x184/0x210\n[52804.650597]        __x64_sys_sendto+0x72/0x80\n[52804.651045]        do_syscall_64+0x6f/0x140\n[52804.651474]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.652001]\n               -\u003e #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}:\n[52804.652650]        check_prev_add+0x1ae/0x1280\n[52804.653107]        __lock_acquire+0x1ed3/0x29a0\n[52804.653559]        lock_acquire+0x174/0x3e0\n[52804.653984]        __mutex_lock+0x119/0x1150\n[52804.654423]        netlink_dump+0xb3/0x780\n[52804.654845]        __netlink_dump_start+0x389/0x450\n[52804.655321]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.655842]        genl_rcv_msg+0x1ed/0x3b0\n[52804.656272]        netlink_rcv_skb+0xdc/0x210\n[52804.656721]        genl_rcv+0x24/0x40\n[52804.657119]        netlink_unicast+0x2f1/0x490\n[52804.657570]        netlink_sendmsg+0x36d/0x660\n[52804.658022]        __sock_sendmsg+0x73/0xc0\n[52804.658450]        __sys_sendto+0x184/0x210\n[52804.658877]        __x64_sys_sendto+0x72/0x80\n[52804.659322]        do_syscall_64+0x6f/0x140\n[52804.659752]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.660281]\n               other info that might help us debug this:\n\n[52804.661077]  Possible unsafe locking scenario:\n\n[52804.661671]        CPU0                    CPU1\n[52804.662129]        ----                    ----\n[52804.662577]   lock(dpll_lock);\n[52804.662924]                                lock(nlk_cb_mutex-GENERIC);\n[52804.663538]                                lock(dpll_lock);\n[52804.664073]   lock(nlk_cb_mutex-GENERIC);\n[52804.664490]\n\nThe issue as follows: __netlink_dump_start() calls control-\u003estart(cb)\nwith nlk-\u003ecb_mutex held. In control-\u003estart(cb) the dpll_lock is taken.\nThen nlk-\u003ecb_mutex is released and taken again in netlink_dump(), while\ndpll_lock still being held. That leads to ABBA deadlock when another\nCPU races with the same operation.\n\nFix this by moving dpll_lock taking into dumpit() callback which ensures\ncorrect lock taking order."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix possible deadlock during netlink dump operation\n\nRecently, I\u0027ve been hitting following deadlock warning during dpll pin\ndump:\n\n[52804.637962] ======================================================\n[52804.638536] WARNING: possible circular locking dependency detected\n[52804.639111] 6.8.0-rc2jiri+ #1 Not tainted\n[52804.639529] ------------------------------------------------------\n[52804.640104] python3/2984 is trying to acquire lock:\n[52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780\n[52804.641417]\n               but task is already holding lock:\n[52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20\n[52804.642747]\n               which lock already depends on the new lock.\n\n[52804.643551]\n               the existing dependency chain (in reverse order) is:\n[52804.644259]\n               -\u003e #1 (dpll_lock){+.+.}-{3:3}:\n[52804.644836]        lock_acquire+0x174/0x3e0\n[52804.645271]        __mutex_lock+0x119/0x1150\n[52804.645723]        dpll_lock_dumpit+0x13/0x20\n[52804.646169]        genl_start+0x266/0x320\n[52804.646578]        __netlink_dump_start+0x321/0x450\n[52804.647056]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.647575]        genl_rcv_msg+0x1ed/0x3b0\n[52804.648001]        netlink_rcv_skb+0xdc/0x210\n[52804.648440]        genl_rcv+0x24/0x40\n[52804.648831]        netlink_unicast+0x2f1/0x490\n[52804.649290]        netlink_sendmsg+0x36d/0x660\n[52804.649742]        __sock_sendmsg+0x73/0xc0\n[52804.650165]        __sys_sendto+0x184/0x210\n[52804.650597]        __x64_sys_sendto+0x72/0x80\n[52804.651045]        do_syscall_64+0x6f/0x140\n[52804.651474]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.652001]\n               -\u003e #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}:\n[52804.652650]        check_prev_add+0x1ae/0x1280\n[52804.653107]        __lock_acquire+0x1ed3/0x29a0\n[52804.653559]        lock_acquire+0x174/0x3e0\n[52804.653984]        __mutex_lock+0x119/0x1150\n[52804.654423]        netlink_dump+0xb3/0x780\n[52804.654845]        __netlink_dump_start+0x389/0x450\n[52804.655321]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.655842]        genl_rcv_msg+0x1ed/0x3b0\n[52804.656272]        netlink_rcv_skb+0xdc/0x210\n[52804.656721]        genl_rcv+0x24/0x40\n[52804.657119]        netlink_unicast+0x2f1/0x490\n[52804.657570]        netlink_sendmsg+0x36d/0x660\n[52804.658022]        __sock_sendmsg+0x73/0xc0\n[52804.658450]        __sys_sendto+0x184/0x210\n[52804.658877]        __x64_sys_sendto+0x72/0x80\n[52804.659322]        do_syscall_64+0x6f/0x140\n[52804.659752]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.660281]\n               other info that might help us debug this:\n\n[52804.661077]  Possible unsafe locking scenario:\n\n[52804.661671]        CPU0                    CPU1\n[52804.662129]        ----                    ----\n[52804.662577]   lock(dpll_lock);\n[52804.662924]                                lock(nlk_cb_mutex-GENERIC);\n[52804.663538]                                lock(dpll_lock);\n[52804.664073]   lock(nlk_cb_mutex-GENERIC);\n[52804.664490]\n\nThe issue as follows: __netlink_dump_start() calls control-\u003estart(cb)\nwith nlk-\u003ecb_mutex held. In control-\u003estart(cb) the dpll_lock is taken.\nThen nlk-\u003ecb_mutex is released and taken again in netlink_dump(), while\ndpll_lock still being held. That leads to ABBA deadlock when another\nCPU races with the same operation.\n\nFix this by moving dpll_lock taking into dumpit() callback which ensures\ncorrect lock taking order."
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        {
          "lang": "es",
          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dpll: soluciona un posible punto muerto durante la operaci\u00f3n de volcado de netlink Recientemente, he estado recibiendo la siguiente advertencia de punto muerto durante el volcado de pin de dpll: [52804.637962] =========== =========================================== [52804.638536] ADVERTENCIA: posible circular dependencia de bloqueo detectada [52804.639111] 6.8.0-rc2jiri+ #1 No contaminado [52804.639529] -------------------------------- ---------------------- [52804.640104] python3/2984 est\u00e1 intentando adquirir el bloqueo: [52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}- {3:3}, en: netlink_dump+0xb3/0x780 [52804.641417] pero la tarea ya mantiene el bloqueo: [52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, en: dpll_lock_dumpit+0x13/0x20 [52804.642747] qu\u00e9 bloqueo ya depende del nuevo bloqueo. [52804.643551] la cadena de dependencia existente (en orden inverso) es: [52804.644259] -\u0026gt; #1 (dpll_lock){+.+.}-{3:3}: [52804.644836] lock_acquire+0x174/0x3e0 [52804.645271] __mutex_lock+ 0x119/0x1150 [52804.645723] dpll_lock_dumpit+0x13/0x20 [52804.646169] genl_start+0x266/0x320 [52804.646578] __netlink_dump_start+0x321/0x450 [52804.647056 ] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.647575] genl_rcv_msg+0x1ed/0x3b0 [52804.648001] netlink_rcv_skb+0xdc/ 0x210 [52804.648440] genl_rcv+0x24/0x40 [52804.648831] netlink_unicast+0x2f1/0x490 [52804.649290] netlink_sendmsg+0x36d/0x660 [52804.649742] __sock_sendmsg +0x73/0xc0 [52804.650165] __sys_sendto+0x184/0x210 [52804.650597] __x64_sys_sendto+0x72/0x80 [ 52804.651045] do_syscall_64+0x6f/0x140 [52804.651474] Entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.652001] -\u0026gt; #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}: [52804.6 52650] check_prev_add+0x1ae/0x1280 [52804.653107 ] __lock_acquire+0x1ed3/0x29a0 [52804.653559] lock_acquire+0x174/0x3e0 [52804.653984] __mutex_lock+0x119/0x1150 [52804.654423] netlink_dump+0xb3/0x780 [52804.654 845] __netlink_dump_start+0x389/0x450 [52804.655321] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.655842] genl_rcv_msg +0x1ed/0x3b0 [52804.656272] netlink_rcv_skb+0xdc/0x210 [52804.656721] genl_rcv+0x24/0x40 [52804.657119] netlink_unicast+0x2f1/0x490 [52804.657570] netlink_sendm sg+0x36d/0x660 [52804.658022] __sock_sendmsg+0x73/0xc0 [52804.658450] __sys_sendto+0x184 /0x210 [52804.658877] __x64_sys_sendto+0x72/0x80 [52804.659322] do_syscall_64+0x6f/0x140 [52804.659752] Entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.66 0281] otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: [52804.661077] Posible escenario de bloqueo inseguro: [52804.661671] CPU0 CPU1 [52804.662129] ---- ---- [52804.662577] bloqueo(dpll_lock); [52804.662924] bloqueo (nlk_cb_mutex-GENERIC); [52804.663538] bloqueo(dpll_lock); [52804.664073] bloqueo (nlk_cb_mutex-GENERIC); [52804.664490] El problema es el siguiente: __netlink_dump_start() llama a control-\u0026gt;start(cb) con nlk-\u0026gt;cb_mutex retenido. En control-\u0026gt;start(cb) se toma dpll_lock. Luego, nlk-\u0026gt;cb_mutex se libera y se toma nuevamente en netlink_dump(), mientras dpll_lock a\u00fan se mantiene. Eso lleva a un punto muerto de ABBA cuando otra CPU corre con la misma operaci\u00f3n. Solucione este problema moviendo dpll_lock a la devoluci\u00f3n de llamada dumpit(), lo que garantiza el orden correcto de toma de bloqueo."
        }
      ],
      "id": "CVE-2024-26725",
      "lastModified": "2025-01-07T17:28:15.293",
      "metrics": {
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            },
            "exploitabilityScore": 1.8,
            "impactScore": 3.6,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2024-04-03T15:15:54.257",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/087739cbd0d0b87b6cec2c0799436ac66e24acc8"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/53c0441dd2c44ee93fddb5473885fd41e4bc2361"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/087739cbd0d0b87b6cec2c0799436ac66e24acc8"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/53c0441dd2c44ee93fddb5473885fd41e4bc2361"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-667"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "Documentation/netlink/specs/dpll.yaml",
                  "drivers/dpll/dpll_netlink.c",
                  "drivers/dpll/dpll_nl.c",
                  "drivers/dpll/dpll_nl.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "087739cbd0d0b87b6cec2c0799436ac66e24acc8",
                    "status": "affected",
                    "version": "9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "53c0441dd2c44ee93fddb5473885fd41e4bc2361",
                    "status": "affected",
                    "version": "9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "Documentation/netlink/specs/dpll.yaml",
                  "drivers/dpll/dpll_netlink.c",
                  "drivers/dpll/dpll_nl.c",
                  "drivers/dpll/dpll_nl.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.7"
                  },
                  {
                    "lessThan": "6.7",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.7.*",
                    "status": "unaffected",
                    "version": "6.7.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.8",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "C6D6A5C8-7308-42A9-8A72-ABF3DEA4BB82",
                    "versionEndExcluding": "6.7.6",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "F02056A5-B362-4370-9FF8-6F0BD384D520",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*",
                    "matchCriteriaId": "62075ACE-B2A0-4B16-829D-B3DA5AE5CC41",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix possible deadlock during netlink dump operation\n\nRecently, I\u0027ve been hitting following deadlock warning during dpll pin\ndump:\n\n[52804.637962] ======================================================\n[52804.638536] WARNING: possible circular locking dependency detected\n[52804.639111] 6.8.0-rc2jiri+ #1 Not tainted\n[52804.639529] ------------------------------------------------------\n[52804.640104] python3/2984 is trying to acquire lock:\n[52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780\n[52804.641417]\n               but task is already holding lock:\n[52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20\n[52804.642747]\n               which lock already depends on the new lock.\n\n[52804.643551]\n               the existing dependency chain (in reverse order) is:\n[52804.644259]\n               -\u003e #1 (dpll_lock){+.+.}-{3:3}:\n[52804.644836]        lock_acquire+0x174/0x3e0\n[52804.645271]        __mutex_lock+0x119/0x1150\n[52804.645723]        dpll_lock_dumpit+0x13/0x20\n[52804.646169]        genl_start+0x266/0x320\n[52804.646578]        __netlink_dump_start+0x321/0x450\n[52804.647056]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.647575]        genl_rcv_msg+0x1ed/0x3b0\n[52804.648001]        netlink_rcv_skb+0xdc/0x210\n[52804.648440]        genl_rcv+0x24/0x40\n[52804.648831]        netlink_unicast+0x2f1/0x490\n[52804.649290]        netlink_sendmsg+0x36d/0x660\n[52804.649742]        __sock_sendmsg+0x73/0xc0\n[52804.650165]        __sys_sendto+0x184/0x210\n[52804.650597]        __x64_sys_sendto+0x72/0x80\n[52804.651045]        do_syscall_64+0x6f/0x140\n[52804.651474]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.652001]\n               -\u003e #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}:\n[52804.652650]        check_prev_add+0x1ae/0x1280\n[52804.653107]        __lock_acquire+0x1ed3/0x29a0\n[52804.653559]        lock_acquire+0x174/0x3e0\n[52804.653984]        __mutex_lock+0x119/0x1150\n[52804.654423]        netlink_dump+0xb3/0x780\n[52804.654845]        __netlink_dump_start+0x389/0x450\n[52804.655321]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.655842]        genl_rcv_msg+0x1ed/0x3b0\n[52804.656272]        netlink_rcv_skb+0xdc/0x210\n[52804.656721]        genl_rcv+0x24/0x40\n[52804.657119]        netlink_unicast+0x2f1/0x490\n[52804.657570]        netlink_sendmsg+0x36d/0x660\n[52804.658022]        __sock_sendmsg+0x73/0xc0\n[52804.658450]        __sys_sendto+0x184/0x210\n[52804.658877]        __x64_sys_sendto+0x72/0x80\n[52804.659322]        do_syscall_64+0x6f/0x140\n[52804.659752]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.660281]\n               other info that might help us debug this:\n\n[52804.661077]  Possible unsafe locking scenario:\n\n[52804.661671]        CPU0                    CPU1\n[52804.662129]        ----                    ----\n[52804.662577]   lock(dpll_lock);\n[52804.662924]                                lock(nlk_cb_mutex-GENERIC);\n[52804.663538]                                lock(dpll_lock);\n[52804.664073]   lock(nlk_cb_mutex-GENERIC);\n[52804.664490]\n\nThe issue as follows: __netlink_dump_start() calls control-\u003estart(cb)\nwith nlk-\u003ecb_mutex held. In control-\u003estart(cb) the dpll_lock is taken.\nThen nlk-\u003ecb_mutex is released and taken again in netlink_dump(), while\ndpll_lock still being held. That leads to ABBA deadlock when another\nCPU races with the same operation.\n\nFix this by moving dpll_lock taking into dumpit() callback which ensures\ncorrect lock taking order."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dpll: soluciona un posible punto muerto durante la operaci\u00f3n de volcado de netlink Recientemente, he estado recibiendo la siguiente advertencia de punto muerto durante el volcado de pin de dpll: [52804.637962] =========== =========================================== [52804.638536] ADVERTENCIA: posible circular dependencia de bloqueo detectada [52804.639111] 6.8.0-rc2jiri+ #1 No contaminado [52804.639529] -------------------------------- ---------------------- [52804.640104] python3/2984 est\u00e1 intentando adquirir el bloqueo: [52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}- {3:3}, en: netlink_dump+0xb3/0x780 [52804.641417] pero la tarea ya mantiene el bloqueo: [52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, en: dpll_lock_dumpit+0x13/0x20 [52804.642747] qu\u00e9 bloqueo ya depende del nuevo bloqueo. [52804.643551] la cadena de dependencia existente (en orden inverso) es: [52804.644259] -\u0026gt; #1 (dpll_lock){+.+.}-{3:3}: [52804.644836] lock_acquire+0x174/0x3e0 [52804.645271] __mutex_lock+ 0x119/0x1150 [52804.645723] dpll_lock_dumpit+0x13/0x20 [52804.646169] genl_start+0x266/0x320 [52804.646578] __netlink_dump_start+0x321/0x450 [52804.647056 ] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.647575] genl_rcv_msg+0x1ed/0x3b0 [52804.648001] netlink_rcv_skb+0xdc/ 0x210 [52804.648440] genl_rcv+0x24/0x40 [52804.648831] netlink_unicast+0x2f1/0x490 [52804.649290] netlink_sendmsg+0x36d/0x660 [52804.649742] __sock_sendmsg +0x73/0xc0 [52804.650165] __sys_sendto+0x184/0x210 [52804.650597] __x64_sys_sendto+0x72/0x80 [ 52804.651045] do_syscall_64+0x6f/0x140 [52804.651474] Entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.652001] -\u0026gt; #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}: [52804.6 52650] check_prev_add+0x1ae/0x1280 [52804.653107 ] __lock_acquire+0x1ed3/0x29a0 [52804.653559] lock_acquire+0x174/0x3e0 [52804.653984] __mutex_lock+0x119/0x1150 [52804.654423] netlink_dump+0xb3/0x780 [52804.654 845] __netlink_dump_start+0x389/0x450 [52804.655321] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.655842] genl_rcv_msg +0x1ed/0x3b0 [52804.656272] netlink_rcv_skb+0xdc/0x210 [52804.656721] genl_rcv+0x24/0x40 [52804.657119] netlink_unicast+0x2f1/0x490 [52804.657570] netlink_sendm sg+0x36d/0x660 [52804.658022] __sock_sendmsg+0x73/0xc0 [52804.658450] __sys_sendto+0x184 /0x210 [52804.658877] __x64_sys_sendto+0x72/0x80 [52804.659322] do_syscall_64+0x6f/0x140 [52804.659752] Entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.66 0281] otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: [52804.661077] Posible escenario de bloqueo inseguro: [52804.661671] CPU0 CPU1 [52804.662129] ---- ---- [52804.662577] bloqueo(dpll_lock); [52804.662924] bloqueo (nlk_cb_mutex-GENERIC); [52804.663538] bloqueo(dpll_lock); [52804.664073] bloqueo (nlk_cb_mutex-GENERIC); [52804.664490] El problema es el siguiente: __netlink_dump_start() llama a control-\u0026gt;start(cb) con nlk-\u0026gt;cb_mutex retenido. En control-\u0026gt;start(cb) se toma dpll_lock. Luego, nlk-\u0026gt;cb_mutex se libera y se toma nuevamente en netlink_dump(), mientras dpll_lock a\u00fan se mantiene. Eso lleva a un punto muerto de ABBA cuando otra CPU corre con la misma operaci\u00f3n. Solucione este problema moviendo dpll_lock a la devoluci\u00f3n de llamada dumpit(), lo que garantiza el orden correcto de toma de bloqueo."
          }
        ],
        "id": "CVE-2024-26725",
        "lastModified": "2026-06-17T07:18:11.083",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-26725",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:52:13.550439Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-04-03T15:15:54.257",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/087739cbd0d0b87b6cec2c0799436ac66e24acc8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/53c0441dd2c44ee93fddb5473885fd41e4bc2361"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/087739cbd0d0b87b6cec2c0799436ac66e24acc8"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/53c0441dd2c44ee93fddb5473885fd41e4bc2361"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-667"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T08:03:02+00:00",
      "cve": "CVE-2024-26725",
      "id": "CVE-2024-26725",
      "initial_release_date": "2024-04-03T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "98",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dpll: fix possible deadlock during netlink dump operation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26725.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:26:44Z",
      "cve": "CVE-2024-26725",
      "id": "CVE-2024-26725",
      "initial_release_date": "2024-04-06T01:59:12Z",
      "product_status:known_not_affected": "362",
      "product_status:recommended": "202",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26725",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26725.json",
      "version": "36"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-02T00:14:12.969Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/087739cbd0d0b87b6cec2c0799436ac66e24acc8"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/53c0441dd2c44ee93fddb5473885fd41e4bc2361"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-26725",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:52:13.550439Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:13.156Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "Documentation/netlink/specs/dpll.yaml",
                "drivers/dpll/dpll_netlink.c",
                "drivers/dpll/dpll_nl.c",
                "drivers/dpll/dpll_nl.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "087739cbd0d0b87b6cec2c0799436ac66e24acc8",
                  "status": "affected",
                  "version": "9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc",
                  "versionType": "git"
                },
                {
                  "lessThan": "53c0441dd2c44ee93fddb5473885fd41e4bc2361",
                  "status": "affected",
                  "version": "9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "Documentation/netlink/specs/dpll.yaml",
                "drivers/dpll/dpll_netlink.c",
                "drivers/dpll/dpll_nl.c",
                "drivers/dpll/dpll_nl.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.7"
                },
                {
                  "lessThan": "6.7",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.7.*",
                  "status": "unaffected",
                  "version": "6.7.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.8",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7.6",
                      "versionStartIncluding": "6.7",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8",
                      "versionStartIncluding": "6.7",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix possible deadlock during netlink dump operation\n\nRecently, I\u0027ve been hitting following deadlock warning during dpll pin\ndump:\n\n[52804.637962] ======================================================\n[52804.638536] WARNING: possible circular locking dependency detected\n[52804.639111] 6.8.0-rc2jiri+ #1 Not tainted\n[52804.639529] ------------------------------------------------------\n[52804.640104] python3/2984 is trying to acquire lock:\n[52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780\n[52804.641417]\n               but task is already holding lock:\n[52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20\n[52804.642747]\n               which lock already depends on the new lock.\n\n[52804.643551]\n               the existing dependency chain (in reverse order) is:\n[52804.644259]\n               -\u003e #1 (dpll_lock){+.+.}-{3:3}:\n[52804.644836]        lock_acquire+0x174/0x3e0\n[52804.645271]        __mutex_lock+0x119/0x1150\n[52804.645723]        dpll_lock_dumpit+0x13/0x20\n[52804.646169]        genl_start+0x266/0x320\n[52804.646578]        __netlink_dump_start+0x321/0x450\n[52804.647056]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.647575]        genl_rcv_msg+0x1ed/0x3b0\n[52804.648001]        netlink_rcv_skb+0xdc/0x210\n[52804.648440]        genl_rcv+0x24/0x40\n[52804.648831]        netlink_unicast+0x2f1/0x490\n[52804.649290]        netlink_sendmsg+0x36d/0x660\n[52804.649742]        __sock_sendmsg+0x73/0xc0\n[52804.650165]        __sys_sendto+0x184/0x210\n[52804.650597]        __x64_sys_sendto+0x72/0x80\n[52804.651045]        do_syscall_64+0x6f/0x140\n[52804.651474]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.652001]\n               -\u003e #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}:\n[52804.652650]        check_prev_add+0x1ae/0x1280\n[52804.653107]        __lock_acquire+0x1ed3/0x29a0\n[52804.653559]        lock_acquire+0x174/0x3e0\n[52804.653984]        __mutex_lock+0x119/0x1150\n[52804.654423]        netlink_dump+0xb3/0x780\n[52804.654845]        __netlink_dump_start+0x389/0x450\n[52804.655321]        genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.655842]        genl_rcv_msg+0x1ed/0x3b0\n[52804.656272]        netlink_rcv_skb+0xdc/0x210\n[52804.656721]        genl_rcv+0x24/0x40\n[52804.657119]        netlink_unicast+0x2f1/0x490\n[52804.657570]        netlink_sendmsg+0x36d/0x660\n[52804.658022]        __sock_sendmsg+0x73/0xc0\n[52804.658450]        __sys_sendto+0x184/0x210\n[52804.658877]        __x64_sys_sendto+0x72/0x80\n[52804.659322]        do_syscall_64+0x6f/0x140\n[52804.659752]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.660281]\n               other info that might help us debug this:\n\n[52804.661077]  Possible unsafe locking scenario:\n\n[52804.661671]        CPU0                    CPU1\n[52804.662129]        ----                    ----\n[52804.662577]   lock(dpll_lock);\n[52804.662924]                                lock(nlk_cb_mutex-GENERIC);\n[52804.663538]                                lock(dpll_lock);\n[52804.664073]   lock(nlk_cb_mutex-GENERIC);\n[52804.664490]\n\nThe issue as follows: __netlink_dump_start() calls control-\u003estart(cb)\nwith nlk-\u003ecb_mutex held. In control-\u003estart(cb) the dpll_lock is taken.\nThen nlk-\u003ecb_mutex is released and taken again in netlink_dump(), while\ndpll_lock still being held. That leads to ABBA deadlock when another\nCPU races with the same operation.\n\nFix this by moving dpll_lock taking into dumpit() callback which ensures\ncorrect lock taking order."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:02:56.186Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/087739cbd0d0b87b6cec2c0799436ac66e24acc8"
            },
            {
              "url": "https://git.kernel.org/stable/c/53c0441dd2c44ee93fddb5473885fd41e4bc2361"
            }
          ],
          "title": "dpll: fix possible deadlock during netlink dump operation",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26725",
        "datePublished": "2024-04-03T14:55:24.074Z",
        "dateReserved": "2024-02-19T14:20:24.163Z",
        "dateUpdated": "2026-05-11T20:02:56.186Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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