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xfrm: serialize state GC with device state flush

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: xfrm: serialize state GC with device state flush The deferred-device pass in xfrm_dev_state_flush() finds states under xfrm_state_dev_gc_lock, but drops the lock before calling xfrm_dev_state_free() because the driver callback may sleep. The device GC list does not hold an xfrm_state reference, so the state GC worker can destroy the same state concurrently. The race can proceed as follows: CPU 0 CPU 1 find x on the device GC list drop xfrm_state_dev_gc_lock read x->xso.dev xfrm_state_gc_destroy(x) xfrm_dev_state_free(x) xfrm_state_free(x) continue xfrm_dev_state_free(x) Both paths can invoke the driver callback and drop the device reference. CPU 0 can also access the xfrm_state after CPU 1 has freed it. KASAN reported: BUG: KASAN: slab-use-after-free in xfrm_dev_state_free+0x24c/0x2a0 Read of size 8 at addr ffff88810bbaa960 by task poc/102 Call Trace: xfrm_dev_state_free+0x24c/0x2a0 xfrm_dev_state_flush+0x353/0x400 xfrm_dev_event+0x26d/0x3a0 notifier_call_chain+0xc0/0x280 __dev_notify_flags+0x169/0x250 netif_change_flags+0xe7/0x160 dev_change_flags+0x96/0x220 devinet_ioctl+0x7f4/0x1880 Allocated by task 87: xfrm_state_alloc+0x1e/0x5c0 xfrm_add_sa+0xe7f/0x5820 xfrm_user_rcv_msg+0x4f3/0x940 Freed by task 57: kmem_cache_free+0xcb/0x3d0 xfrm_state_gc_task+0x4a8/0x650 process_one_work+0x63a/0x1070 Serialize xfrm_state destruction against the deferred-device pass with a mutex. Keep xfrm_state_dev_gc_lock limited to

Announced Source revision 1
Original source ↗

CVE-2026-98231

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98231

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "d5f53edd43daf3e6e1633a49c561387f8f99e13f",
        "lessThan": "937108dc0258d6ac69926b00bc53598c98986ee1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "07b87f9eea0c30675084d50c82532d20168da009",
        "lessThan": "39e41af3653ee45c985190dd97426f318918d201",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "07b87f9eea0c30675084d50c82532d20168da009",
        "lessThan": "75fc4561772e2f9811abf39ed10443e6f4a4bc6c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "07b87f9eea0c30675084d50c82532d20168da009",
        "lessThan": "84e378395494963b1e581cf223a7cbeec8c0e2d6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "07b87f9eea0c30675084d50c82532d20168da009",
        "lessThan": "89fefad9f971bc637fb22373078144f2563c4be9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ecee44464a4926c9bef989a1490b7394785f584",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.44",
        "lessThan": "6.6.158",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.10.3",
        "lessThan": "6.11",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/xfrm/xfrm_state.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/xfrm/xfrm_state.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98231

Source reference: /cveMetadata/cveId

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Event
#38311 · Revision 1
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