CVE-2026-53239 (GCVE-0-2026-53239)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI
Title
xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
Summary
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
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 8fc536e9f6856230f19c7d13e71af064b6a77b22 (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < c4c1ea36d83bf3c4569468ca5b8b614fda1bf821 (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7 (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 42827d03f8009a6a218bacab153e21f39d6a121c (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 88697cf980222d5906a37bf47662dac0732e2a0f (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < b5316e2b8614a87d8736941972441cb47bfd4491 (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < ec82ea4eb220164d854f8734ca5a35e23e577b94 (git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 7f2d76c9c03257c0782afef9d95321fa04096f60 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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The wrapper xfrm_policy_inexact_prune_bin()\\nbecomes unused and is removed.\\n\\nRace:\\n\\n  CPU0 (XFRM_MSG_DELPOLICY)           CPU1 (XFRM_MSG_NEWSPDINFO)\\n  ==========================          ==========================\\n  xfrm_policy_bysel_ctx():\\n    spin_lock_bh(xfrm_policy_lock)\\n    bin = xfrm_policy_inexact_lookup()\\n    __xfrm_policy_unlink(pol)\\n    spin_unlock_bh(xfrm_policy_lock)\\n    xfrm_policy_kill(ret)\\n    // wide window, lock not held\\n                                       xfrm_hash_rebuild():\\n                                         spin_lock_bh(xfrm_policy_lock)\\n                                         __xfrm_policy_inexact_flush():\\n                                           kfree_rcu(bin)  // bin freed\\n                                         spin_unlock_bh(xfrm_policy_lock)\\n    xfrm_policy_inexact_prune_bin(bin)\\n    // UAF: bin is freed\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xfrm/xfrm_policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xfrm/xfrm_policy.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\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"1A9E792C-DB8D-45E1-BA0E-FADA558D6B15\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.210\",\"matchCriteriaId\":\"5E938CDF-D1C4-43D0-98DC-9E11B6B55801\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"C4446623-5F2B-4DD8-8666-9FAAC285A757\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"85421C0C-ABDE-4357-971C-67F9087DE1B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.36\",\"matchCriteriaId\":\"389025D2-958D-41BD-BD96-70ED1033A9F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-26T08:45:15+00:00",
      "cve": "CVE-2026-53239",
      "id": "CVE-2026-53239",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53239.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.