CVE-2022-49372 (GCVE-0-2022-49372)
Vulnerability from cvelistv5
Published
2025-02-26 02:11
Modified
2025-05-04 08:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: tcp_rtx_synack() can be called from process context Laurent reported the enclosed report [1] This bug triggers with following coditions: 0) Kernel built with CONFIG_DEBUG_PREEMPT=y 1) A new passive FastOpen TCP socket is created. This FO socket waits for an ACK coming from client to be a complete ESTABLISHED one. 2) A socket operation on this socket goes through lock_sock() release_sock() dance. 3) While the socket is owned by the user in step 2), a retransmit of the SYN is received and stored in socket backlog. 4) At release_sock() time, the socket backlog is processed while in process context. 5) A SYNACK packet is cooked in response of the SYN retransmit. 6) -> tcp_rtx_synack() is called in process context. Before blamed commit, tcp_rtx_synack() was always called from BH handler, from a timer handler. Fix this by using TCP_INC_STATS() & NET_INC_STATS() which do not assume caller is in non preemptible context. [1] BUG: using __this_cpu_add() in preemptible [00000000] code: epollpep/2180 caller is tcp_rtx_synack.part.0+0x36/0xc0 CPU: 10 PID: 2180 Comm: epollpep Tainted: G OE 5.16.0-0.bpo.4-amd64 #1 Debian 5.16.12-1~bpo11+1 Hardware name: Supermicro SYS-5039MC-H8TRF/X11SCD-F, BIOS 1.7 11/23/2021 Call Trace: <TASK> dump_stack_lvl+0x48/0x5e check_preemption_disabled+0xde/0xe0 tcp_rtx_synack.part.0+0x36/0xc0 tcp_rtx_synack+0x8d/0xa0 ? kmem_cache_alloc+0x2e0/0x3e0 ? apparmor_file_alloc_security+0x3b/0x1f0 inet_rtx_syn_ack+0x16/0x30 tcp_check_req+0x367/0x610 tcp_rcv_state_process+0x91/0xf60 ? get_nohz_timer_target+0x18/0x1a0 ? lock_timer_base+0x61/0x80 ? preempt_count_add+0x68/0xa0 tcp_v4_do_rcv+0xbd/0x270 __release_sock+0x6d/0xb0 release_sock+0x2b/0x90 sock_setsockopt+0x138/0x1140 ? __sys_getsockname+0x7e/0xc0 ? aa_sk_perm+0x3e/0x1a0 __sys_setsockopt+0x198/0x1e0 __x64_sys_setsockopt+0x21/0x30 do_syscall_64+0x38/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae
References
https://git.kernel.org/stable/c/3db889f883e65bbd3b1401279bfc1e9ed255c481
https://git.kernel.org/stable/c/c348b0f8d035fc4bdc040796889beec7218bd1b8
https://git.kernel.org/stable/c/58bd38cbc961fd799842b7be8c5222310f04b908
https://git.kernel.org/stable/c/d05c2fdf8e10528bb6751bd95243e862d5402a9b
https://git.kernel.org/stable/c/0a0f7f84148445c9f02f226928803a870139d820
https://git.kernel.org/stable/c/88cd232146207ff1d41dededed5e77c0d4438113
https://git.kernel.org/stable/c/bdc28a8fb43cc476e33b11519235adb816ce00e8
https://git.kernel.org/stable/c/d8e1bc6029acac796293310aacef7b7336f35b6a
https://git.kernel.org/stable/c/0a375c822497ed6ad6b5da0792a12a6f1af10c0b
Impacted products
Vendor Product Version
Linux Linux Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
Version: 168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef
 Create a notification for this product.
   Linux Linux Version: 3.7
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_output.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3db889f883e65bbd3b1401279bfc1e9ed255c481",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "c348b0f8d035fc4bdc040796889beec7218bd1b8",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "58bd38cbc961fd799842b7be8c5222310f04b908",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "d05c2fdf8e10528bb6751bd95243e862d5402a9b",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "0a0f7f84148445c9f02f226928803a870139d820",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "88cd232146207ff1d41dededed5e77c0d4438113",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "bdc28a8fb43cc476e33b11519235adb816ce00e8",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "d8e1bc6029acac796293310aacef7b7336f35b6a",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            },
            {
              "lessThan": "0a375c822497ed6ad6b5da0792a12a6f1af10c0b",
              "status": "affected",
              "version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_output.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.7"
            },
            {
              "lessThan": "3.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.318",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.283",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.247",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.122",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.15",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.318",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.283",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.247",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.198",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.122",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.47",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.15",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.4",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: tcp_rtx_synack() can be called from process context\n\nLaurent reported the enclosed report [1]\n\nThis bug triggers with following coditions:\n\n0) Kernel built with CONFIG_DEBUG_PREEMPT=y\n\n1) A new passive FastOpen TCP socket is created.\n   This FO socket waits for an ACK coming from client to be a complete\n   ESTABLISHED one.\n2) A socket operation on this socket goes through lock_sock()\n   release_sock() dance.\n3) While the socket is owned by the user in step 2),\n   a retransmit of the SYN is received and stored in socket backlog.\n4) At release_sock() time, the socket backlog is processed while\n   in process context.\n5) A SYNACK packet is cooked in response of the SYN retransmit.\n6) -\u003e tcp_rtx_synack() is called in process context.\n\nBefore blamed commit, tcp_rtx_synack() was always called from BH handler,\nfrom a timer handler.\n\nFix this by using TCP_INC_STATS() \u0026 NET_INC_STATS()\nwhich do not assume caller is in non preemptible context.\n\n[1]\nBUG: using __this_cpu_add() in preemptible [00000000] code: epollpep/2180\ncaller is tcp_rtx_synack.part.0+0x36/0xc0\nCPU: 10 PID: 2180 Comm: epollpep Tainted: G           OE     5.16.0-0.bpo.4-amd64 #1  Debian 5.16.12-1~bpo11+1\nHardware name: Supermicro SYS-5039MC-H8TRF/X11SCD-F, BIOS 1.7 11/23/2021\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x48/0x5e\n check_preemption_disabled+0xde/0xe0\n tcp_rtx_synack.part.0+0x36/0xc0\n tcp_rtx_synack+0x8d/0xa0\n ? kmem_cache_alloc+0x2e0/0x3e0\n ? apparmor_file_alloc_security+0x3b/0x1f0\n inet_rtx_syn_ack+0x16/0x30\n tcp_check_req+0x367/0x610\n tcp_rcv_state_process+0x91/0xf60\n ? get_nohz_timer_target+0x18/0x1a0\n ? lock_timer_base+0x61/0x80\n ? preempt_count_add+0x68/0xa0\n tcp_v4_do_rcv+0xbd/0x270\n __release_sock+0x6d/0xb0\n release_sock+0x2b/0x90\n sock_setsockopt+0x138/0x1140\n ? __sys_getsockname+0x7e/0xc0\n ? aa_sk_perm+0x3e/0x1a0\n __sys_setsockopt+0x198/0x1e0\n __x64_sys_setsockopt+0x21/0x30\n do_syscall_64+0x38/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:36:17.133Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3db889f883e65bbd3b1401279bfc1e9ed255c481"
        },
        {
          "url": "https://git.kernel.org/stable/c/c348b0f8d035fc4bdc040796889beec7218bd1b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/58bd38cbc961fd799842b7be8c5222310f04b908"
        },
        {
          "url": "https://git.kernel.org/stable/c/d05c2fdf8e10528bb6751bd95243e862d5402a9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a0f7f84148445c9f02f226928803a870139d820"
        },
        {
          "url": "https://git.kernel.org/stable/c/88cd232146207ff1d41dededed5e77c0d4438113"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdc28a8fb43cc476e33b11519235adb816ce00e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8e1bc6029acac796293310aacef7b7336f35b6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a375c822497ed6ad6b5da0792a12a6f1af10c0b"
        }
      ],
      "title": "tcp: tcp_rtx_synack() can be called from process context",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49372",
    "datePublished": "2025-02-26T02:11:14.119Z",
    "dateReserved": "2025-02-26T02:08:31.555Z",
    "dateUpdated": "2025-05-04T08:36:17.133Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.