CVE-2026-53239xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 6be3b0db6db82cf056a72cc18042048edd27f8ee before 8fc536e9f6856230f19c7d13e71af064b6a77b22; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before c4c1ea36d83bf3c4569468ca5b8b614fda1bf821; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before 42827d03f8009a6a218bacab153e21f39d6a121c; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before 88697cf980222d5906a37bf47662dac0732e2a0f; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before b5316e2b8614a87d8736941972441cb47bfd4491; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before ec82ea4eb220164d854f8734ca5a35e23e577b94; from 6be3b0db6db82cf056a72cc18042048edd27f8ee before 7f2d76c9c03257c0782afef9d95321fa04096f60 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.0 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22patch
- https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821patch
- https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7patch
- https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121cpatch
- https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0fpatch
- https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491patch
- https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94patch
- https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.