CVE-2026-43090 (GCVE-0-2026-43090)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17
VLAI
Title
xfrm: fix refcount leak in xfrm_migrate_policy_find
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: fix refcount leak in xfrm_migrate_policy_find syzkaller reported a memory leak in xfrm_policy_alloc: BUG: memory leak unreferenced object 0xffff888114d79000 (size 1024): comm "syz.1.17", pid 931 ... xfrm_policy_alloc+0xb3/0x4b0 net/xfrm/xfrm_policy.c:432 The root cause is a double call to xfrm_pol_hold_rcu() in xfrm_migrate_policy_find(). The lookup function already returns a policy with held reference, making the second call redundant. Remove the redundant xfrm_pol_hold_rcu() call to fix the refcount imbalance and prevent the memory leak. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 563d5ca93e883b9dcb4b7dc8967ac569fd91820d , < 21e235a36cfb6d145cefb10728f12f5dc5412f54 (git)
Affected: 563d5ca93e883b9dcb4b7dc8967ac569fd91820d , < 836ee1b0426ea3db31531e9581cc32f513d24e32 (git)
Affected: 563d5ca93e883b9dcb4b7dc8967ac569fd91820d , < 70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a (git)
Affected: 563d5ca93e883b9dcb4b7dc8967ac569fd91820d , < 83317cce60a032c49480dcdabe146435bd689d03 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T07:35:12+00:00",
      "cve": "CVE-2026-43090",
      "id": "CVE-2026-43090",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: fix refcount leak in xfrm_migrate_policy_find",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43090.json",
      "version": "3"
    }
  }
}



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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.
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  • 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.


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