CVE-2026-80739 (GCVE-0-2026-80739)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-09-03 08:21

Title

net/mlx5e: TC, Check if flow is PEER before acquiring devcom lock

Summary

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: TC, Check if flow is PEER before acquiring devcom lock In case __mlx5e_add_fdb_flow() fails in lower levels, the flow is deleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring ESW devcom lock without condition. In addition, in case of peer_flow, __mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock. This results in an AA deadlock. To fix this, introduce a new PEER flag that is set on flows created as peer flows (the duplicate flows on peer devices), and check it in mlx5e_tc_del_flow() before acquiring ESW devcom lock. Lockdep splat: ============================================ WARNING: possible recursive locking detected ============================================ Possible unsafe locking scenario: CPU0 ---- lock(&comp->lock_key#2); lock(&comp->lock_key#2); *** DEADLOCK *** Call Trace: <TASK> dump_stack_lvl+0x69/0xa0 print_deadlock_bug.cold+0xbd/0xca __lock_acquire+0x1671/0x2ec0 lock_acquire+0x10e/0x2e0 down_read+0x95/0x430 mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core] mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core] mlx5e_flow_put+0x99/0x100 [mlx5_core] __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core] mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core] mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core] mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core] tc_setup_cb_add+0x1dc/0x470 fl_change+0x2f4d/0x626d [cls_flower] tc_new_tfilter+0x79b/0x2310 rtnetlink_rcv_msg+0x778/0xad0 do_syscall_64+0x70/0x960 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK>

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/607adbda01053abf5…
https://git.kernel.org/stable/c/585df8643081e6f61…
https://git.kernel.org/stable/c/ff9e7d5e3500be389…
https://git.kernel.org/stable/c/7165fe321c61ec138…
https://git.kernel.org/stable/c/6ddfba2ea98db21b0…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d , < 607adbda01053abf5f93e322fe39325da8828cb8 (git) Affected: 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d , < 585df8643081e6f616579bc52cd49ac823a57c82 (git) Affected: 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d , < ff9e7d5e3500be389ce7a0e46db3a77149830bc9 (git) Affected: 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d , < 7165fe321c61ec138850c02f030f274797761f5f (git) Affected: 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d , < 6ddfba2ea98db21b001e0e5c472499156224650c (git)	guessed
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h",
            "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "607adbda01053abf5f93e322fe39325da8828cb8",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "585df8643081e6f616579bc52cd49ac823a57c82",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "ff9e7d5e3500be389ce7a0e46db3a77149830bc9",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "7165fe321c61ec138850c02f030f274797761f5f",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "6ddfba2ea98db21b001e0e5c472499156224650c",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h",
            "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: TC, Check if flow is PEER before acquiring devcom lock\n\nIn case __mlx5e_add_fdb_flow() fails in lower levels, the flow is\ndeleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring\nESW devcom lock without condition. In addition, in case of peer_flow,\n__mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock.\nThis results in an AA deadlock.\n\nTo fix this, introduce a new PEER flag that is set on flows created as\npeer flows (the duplicate flows on peer devices), and check it in\nmlx5e_tc_del_flow() before acquiring ESW devcom lock.\n\nLockdep splat:\n============================================\nWARNING: possible recursive locking detected\n============================================\n Possible unsafe locking scenario:\n       CPU0\n       ----\n  lock(\u0026comp-\u003elock_key#2);\n  lock(\u0026comp-\u003elock_key#2);\n *** DEADLOCK ***\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x69/0xa0\n print_deadlock_bug.cold+0xbd/0xca\n __lock_acquire+0x1671/0x2ec0\n lock_acquire+0x10e/0x2e0\n down_read+0x95/0x430\n mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core]\n mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core]\n mlx5e_flow_put+0x99/0x100 [mlx5_core]\n __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core]\n mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core]\n mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core]\n mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core]\n tc_setup_cb_add+0x1dc/0x470\n fl_change+0x2f4d/0x626d [cls_flower]\n tc_new_tfilter+0x79b/0x2310\n rtnetlink_rcv_msg+0x778/0xad0\n do_syscall_64+0x70/0x960\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-03T08:21:53.739Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c"
        }
      ],
      "title": "net/mlx5e: TC, Check if flow is PEER before acquiring devcom lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80739",
    "datePublished": "2026-09-03T08:21:53.739Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-03T08:21:53.739Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80739",
      "date": "2026-09-03",
      "epss": "0.002",
      "percentile": "0.0982"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80739\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-03T13:06:13.040\",\"lastModified\":\"2026-09-03T13:06:13.040\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/mlx5e: TC, Check if flow is PEER before acquiring devcom lock\\n\\nIn case __mlx5e_add_fdb_flow() fails in lower levels, the flow is\\ndeleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring\\nESW devcom lock without condition. In addition, in case of peer_flow,\\n__mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock.\\nThis results in an AA deadlock.\\n\\nTo fix this, introduce a new PEER flag that is set on flows created as\\npeer flows (the duplicate flows on peer devices), and check it in\\nmlx5e_tc_del_flow() before acquiring ESW devcom lock.\\n\\nLockdep splat:\\n============================================\\nWARNING: possible recursive locking detected\\n============================================\\n Possible unsafe locking scenario:\\n       CPU0\\n       ----\\n  lock(\u0026comp-\u003elock_key#2);\\n  lock(\u0026comp-\u003elock_key#2);\\n *** DEADLOCK ***\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x69/0xa0\\n print_deadlock_bug.cold+0xbd/0xca\\n __lock_acquire+0x1671/0x2ec0\\n lock_acquire+0x10e/0x2e0\\n down_read+0x95/0x430\\n mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core]\\n mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core]\\n mlx5e_flow_put+0x99/0x100 [mlx5_core]\\n __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core]\\n mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core]\\n mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core]\\n mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core]\\n tc_setup_cb_add+0x1dc/0x470\\n fl_change+0x2f4d/0x626d [cls_flower]\\n tc_new_tfilter+0x79b/0x2310\\n rtnetlink_rcv_msg+0x778/0xad0\\n do_syscall_64+0x70/0x960\\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n \u003c/TASK\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h\",\"drivers/net/ethernet/mellanox/mlx5/core/en_tc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d\",\"lessThan\":\"607adbda01053abf5f93e322fe39325da8828cb8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d\",\"lessThan\":\"585df8643081e6f616579bc52cd49ac823a57c82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d\",\"lessThan\":\"ff9e7d5e3500be389ce7a0e46db3a77149830bc9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d\",\"lessThan\":\"7165fe321c61ec138850c02f030f274797761f5f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d\",\"lessThan\":\"6ddfba2ea98db21b001e0e5c472499156224650c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h\",\"drivers/net/ethernet/mellanox/mlx5/core/en_tc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-80739

Vulnerability from fkie_nvd - Published: 2026-09-03 13:06 - Updated: 2026-09-03 13:06

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h",
            "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "607adbda01053abf5f93e322fe39325da8828cb8",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "585df8643081e6f616579bc52cd49ac823a57c82",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "ff9e7d5e3500be389ce7a0e46db3a77149830bc9",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "7165fe321c61ec138850c02f030f274797761f5f",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            },
            {
              "lessThan": "6ddfba2ea98db21b001e0e5c472499156224650c",
              "status": "affected",
              "version": "04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h",
            "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: TC, Check if flow is PEER before acquiring devcom lock\n\nIn case __mlx5e_add_fdb_flow() fails in lower levels, the flow is\ndeleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring\nESW devcom lock without condition. In addition, in case of peer_flow,\n__mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock.\nThis results in an AA deadlock.\n\nTo fix this, introduce a new PEER flag that is set on flows created as\npeer flows (the duplicate flows on peer devices), and check it in\nmlx5e_tc_del_flow() before acquiring ESW devcom lock.\n\nLockdep splat:\n============================================\nWARNING: possible recursive locking detected\n============================================\n Possible unsafe locking scenario:\n       CPU0\n       ----\n  lock(\u0026comp-\u003elock_key#2);\n  lock(\u0026comp-\u003elock_key#2);\n *** DEADLOCK ***\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x69/0xa0\n print_deadlock_bug.cold+0xbd/0xca\n __lock_acquire+0x1671/0x2ec0\n lock_acquire+0x10e/0x2e0\n down_read+0x95/0x430\n mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core]\n mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core]\n mlx5e_flow_put+0x99/0x100 [mlx5_core]\n __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core]\n mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core]\n mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core]\n mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core]\n tc_setup_cb_add+0x1dc/0x470\n fl_change+0x2f4d/0x626d [cls_flower]\n tc_new_tfilter+0x79b/0x2310\n rtnetlink_rcv_msg+0x778/0xad0\n do_syscall_64+0x70/0x960\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \u003c/TASK\u003e"
    }
  ],
  "id": "CVE-2026-80739",
  "lastModified": "2026-09-03T13:06:13.040",
  "metrics": {},
  "published": "2026-09-03T13:06:13.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-MQQ3-JV52-Q32J

Vulnerability from github – Published: 2026-09-03 15:32 – Updated: 2026-09-03 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: TC, Check if flow is PEER before acquiring devcom lock

In case __mlx5e_add_fdb_flow() fails in lower levels, the flow is deleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring ESW devcom lock without condition. In addition, in case of peer_flow, __mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock. This results in an AA deadlock.

To fix this, introduce a new PEER flag that is set on flows created as peer flows (the duplicate flows on peer devices), and check it in mlx5e_tc_del_flow() before acquiring ESW devcom lock.

Lockdep splat:

WARNING: possible recursive locking detected

Possible unsafe locking scenario: CPU0 ---- lock(&comp->lock_key#2); lock(&comp->lock_key#2); *** DEADLOCK *** Call Trace: dump_stack_lvl+0x69/0xa0 print_deadlock_bug.cold+0xbd/0xca __lock_acquire+0x1671/0x2ec0 lock_acquire+0x10e/0x2e0 down_read+0x95/0x430 mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core] mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core] mlx5e_flow_put+0x99/0x100 [mlx5_core] __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core] mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core] mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core] mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core] tc_setup_cb_add+0x1dc/0x470 fl_change+0x2f4d/0x626d [cls_flower] tc_new_tfilter+0x79b/0x2310 rtnetlink_rcv_msg+0x778/0xad0 do_syscall_64+0x70/0x960 entry_SYSCALL_64_after_hwframe+0x4b/0x53

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80739"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-03T13:06:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: TC, Check if flow is PEER before acquiring devcom lock\n\nIn case __mlx5e_add_fdb_flow() fails in lower levels, the flow is\ndeleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring\nESW devcom lock without condition. In addition, in case of peer_flow,\n__mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock.\nThis results in an AA deadlock.\n\nTo fix this, introduce a new PEER flag that is set on flows created as\npeer flows (the duplicate flows on peer devices), and check it in\nmlx5e_tc_del_flow() before acquiring ESW devcom lock.\n\nLockdep splat:\n============================================\nWARNING: possible recursive locking detected\n============================================\n Possible unsafe locking scenario:\n       CPU0\n       ----\n  lock(\u0026comp-\u003elock_key#2);\n  lock(\u0026comp-\u003elock_key#2);\n *** DEADLOCK ***\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x69/0xa0\n print_deadlock_bug.cold+0xbd/0xca\n __lock_acquire+0x1671/0x2ec0\n lock_acquire+0x10e/0x2e0\n down_read+0x95/0x430\n mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core]\n mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core]\n mlx5e_flow_put+0x99/0x100 [mlx5_core]\n __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core]\n mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core]\n mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core]\n mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core]\n tc_setup_cb_add+0x1dc/0x470\n fl_change+0x2f4d/0x626d [cls_flower]\n tc_new_tfilter+0x79b/0x2310\n rtnetlink_rcv_msg+0x778/0xad0\n do_syscall_64+0x70/0x960\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \u003c/TASK\u003e",
  "id": "GHSA-mqq3-jv52-q32j",
  "modified": "2026-09-03T15:32:15Z",
  "published": "2026-09-03T15:32:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80739"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-80739 (GCVE-0-2026-80739)

FKIE_CVE-2026-80739

GHSA-MQQ3-JV52-Q32J

Lockdep splat:

WARNING: possible recursive locking detected

Tags

Sightings

Nomenclature