CVE-2026-31406 (GCVE-0-2026-31406)

Vulnerability from cvelistv5 – Published: 2026-04-06 07:38 – Updated: 2026-04-06 07:38
VLAI?
Title
xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() After cancel_delayed_work_sync() is called from xfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining states via __xfrm_state_delete(), which calls xfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work. The following is a simple race scenario: cpu0 cpu1 cleanup_net() [Round 1] ops_undo_list() xfrm_net_exit() xfrm_nat_keepalive_net_fini() cancel_delayed_work_sync(nat_keepalive_work); xfrm_state_fini() xfrm_state_flush() xfrm_state_delete(x) __xfrm_state_delete(x) xfrm_nat_keepalive_state_updated(x) schedule_delayed_work(nat_keepalive_work); rcu_barrier(); net_complete_free(); net_passive_dec(net); llist_add(&net->defer_free_list, &defer_free_list); cleanup_net() [Round 2] rcu_barrier(); net_complete_free() kmem_cache_free(net_cachep, net); nat_keepalive_work() // on freed net To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < 32d0f44c2f14d60fe8e920e69a28c11051543ec1 (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < 2255ed6adbc3100d2c4a83abd9d0396d04b87792 (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < 21f2fc49ca6faa393c31da33b8a4e6c41fc84c13 (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < daf8e3b253aa760ff9e96c7768a464bc1d6b3c90 (git)
Create a notification for this product.
    Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc6 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_nat_keepalive.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "32d0f44c2f14d60fe8e920e69a28c11051543ec1",
              "status": "affected",
              "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
              "versionType": "git"
            },
            {
              "lessThan": "2255ed6adbc3100d2c4a83abd9d0396d04b87792",
              "status": "affected",
              "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
              "versionType": "git"
            },
            {
              "lessThan": "21f2fc49ca6faa393c31da33b8a4e6c41fc84c13",
              "status": "affected",
              "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
              "versionType": "git"
            },
            {
              "lessThan": "daf8e3b253aa760ff9e96c7768a464bc1d6b3c90",
              "status": "affected",
              "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_nat_keepalive.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0-rc6",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()\n\nAfter cancel_delayed_work_sync() is called from\nxfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining\nstates via __xfrm_state_delete(), which calls\nxfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.\n\nThe following is a simple race scenario:\n\n           cpu0                             cpu1\n\ncleanup_net() [Round 1]\n  ops_undo_list()\n    xfrm_net_exit()\n      xfrm_nat_keepalive_net_fini()\n        cancel_delayed_work_sync(nat_keepalive_work);\n      xfrm_state_fini()\n        xfrm_state_flush()\n          xfrm_state_delete(x)\n            __xfrm_state_delete(x)\n              xfrm_nat_keepalive_state_updated(x)\n                schedule_delayed_work(nat_keepalive_work);\n  rcu_barrier();\n  net_complete_free();\n  net_passive_dec(net);\n    llist_add(\u0026net-\u003edefer_free_list, \u0026defer_free_list);\n\ncleanup_net() [Round 2]\n  rcu_barrier();\n  net_complete_free()\n    kmem_cache_free(net_cachep, net);\n                                     nat_keepalive_work()\n                                       // on freed net\n\nTo prevent this, cancel_delayed_work_sync() is replaced with\ndisable_delayed_work_sync()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-06T07:38:18.840Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792"
        },
        {
          "url": "https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13"
        },
        {
          "url": "https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90"
        }
      ],
      "title": "xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31406",
    "datePublished": "2026-04-06T07:38:18.840Z",
    "dateReserved": "2026-03-09T15:48:24.086Z",
    "dateUpdated": "2026-04-06T07:38:18.840Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31406\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-06T08:16:38.457\",\"lastModified\":\"2026-04-07T13:20:35.010\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()\\n\\nAfter cancel_delayed_work_sync() is called from\\nxfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining\\nstates via __xfrm_state_delete(), which calls\\nxfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.\\n\\nThe following is a simple race scenario:\\n\\n           cpu0                             cpu1\\n\\ncleanup_net() [Round 1]\\n  ops_undo_list()\\n    xfrm_net_exit()\\n      xfrm_nat_keepalive_net_fini()\\n        cancel_delayed_work_sync(nat_keepalive_work);\\n      xfrm_state_fini()\\n        xfrm_state_flush()\\n          xfrm_state_delete(x)\\n            __xfrm_state_delete(x)\\n              xfrm_nat_keepalive_state_updated(x)\\n                schedule_delayed_work(nat_keepalive_work);\\n  rcu_barrier();\\n  net_complete_free();\\n  net_passive_dec(net);\\n    llist_add(\u0026net-\u003edefer_free_list, \u0026defer_free_list);\\n\\ncleanup_net() [Round 2]\\n  rcu_barrier();\\n  net_complete_free()\\n    kmem_cache_free(net_cachep, net);\\n                                     nat_keepalive_work()\\n                                       // on freed net\\n\\nTo prevent this, cancel_delayed_work_sync() is replaced with\\ndisable_delayed_work_sync().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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 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.