Skip to content
Heist/ feed
High

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() Fix the race by pruning the bin while still holding xfrm_policy_lock, before dropping it. Use __xfrm_policy_inexact_prune_bin() directly since the lock is already held. The wrapper xfrm_policy_inexact_prune_bin() becomes unused and is removed. Race: CPU0 (XFRM_MSG_DELPOLICY) CPU1 (XFRM_MSG_NEWSPDINFO) ========================== ========================== xfrm_policy_bysel_ctx(): spin_lock_bh(xfrm_policy_lock) bin = xfrm_policy_inexact_lookup() __xfrm_policy_unlink(pol) spin_unlock_bh(xfrm_policy_lock) xfrm_policy_kill(ret) // wide window, lock not held xfrm_hash_rebuild(): spin_lock_bh(xfrm_policy_lock) __xfrm_policy_inexact_flush(): kfree_rcu(bin) // bin freed spin_unlock_bh(xfrm_policy_lock) xfrm_policy_inexact_prune_bin(bin) // UAF: bin is freed

Announced Source revision 1
Original source ↗

CVE-2026-53239

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-2026-53239

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": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "8fc536e9f6856230f19c7d13e71af064b6a77b22",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "c4c1ea36d83bf3c4569468ca5b8b614fda1bf821",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "25c8c7fb3b0b9668c7d05e209f58c158d2b020c7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "42827d03f8009a6a218bacab153e21f39d6a121c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "88697cf980222d5906a37bf47662dac0732e2a0f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "b5316e2b8614a87d8736941972441cb47bfd4491",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "ec82ea4eb220164d854f8734ca5a35e23e577b94",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6be3b0db6db82cf056a72cc18042048edd27f8ee",
        "lessThan": "7f2d76c9c03257c0782afef9d95321fa04096f60",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/xfrm/xfrm_policy.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/xfrm/xfrm_policy.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53239

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40790 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement