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CVE-2026-53239

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in 8fc536e9f6856230f19c7d13e71af064b6a77b22; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in c4c1ea36d83bf3c4569468ca5b8b614fda1bf821; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in 42827d03f8009a6a218bacab153e21f39d6a121c; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in 88697cf980222d5906a37bf47662dac0732e2a0f; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in b5316e2b8614a87d8736941972441cb47bfd4491; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in ec82ea4eb220164d854f8734ca5a35e23e577b94; From 6be3b0db6db82cf056a72cc18042048edd27f8ee · fixed in 7f2d76c9c03257c0782afef9d95321fa04096f60

  • Linux Linux

    5.0

  • KernelLinux

    From 5.0.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.13

References 8

git.kernel.org