CVE-2026-64579xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert xfrm_hash_rebuild()'s first loop preallocates the bins/chains the reinsert loop needs, so the reinsert (after hlist_del_rcu()) cannot allocate or fail. But its guard is inverted: it skips policies with prefixlen < threshold and preallocates for the rest. prefixlen < threshold is exactly when policy_hash_bysel() returns NULL and the reinsert takes the allocating xfrm_policy_inexact_insert() path. So the loop preallocates for the exact policies (which never allocate) and skips the inexact ones, whose bin/node is then allocated GFP_ATOMIC during reinsert. On failure the error path only WARN_ONCE()s and continues, leaving a poisoned bydst node; the next rebuild's hlist_del_rcu() dereferences LIST_POISON2 and takes a GPF. Reachable under memory pressure, deterministic via failslab. Invert the guard so preallocation covers exactly the reinserted policies; the reinsert then allocates nothing and cannot fail. Crash: Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI KASAN: maybe wild-memory-access in range [0xdead...] ... Workqueue: events xfrm_hash_rebuild RIP: 0010:xfrm_hash_rebuild+0x5b3/0x1190 RAX: dead000000000122 (LIST_POISON2 + offset) ... Call Trace: hlist_del_rcu (include/linux/rculist.h:599) xfrm_hash_rebuild (net/xfrm/xfrm_policy.c:1365) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) ... Kernel panic - not syncing: Fatal exception in interrupt
Timeline
ID reserved
By Linux
- 17 days later
· 17 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < e48f4c3e3df35b34be719d72d737bbeaca77cf0c
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < 1cdeed9df1306f1a277e715600772640d63defa9
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < 43a4d510523779891cf8eca7ffb4a086b0b5d8bf
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < d9d9cc21cc90014724a14c447e3d587be9447107
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < 94c00391a5117530188334f740ce26d3f1256190
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < 7acc5ed2f33608a3d83b64f50a5766843b6e2485
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < 6aa3796d18a9fda953ad76a62b57bf6c145cb9ef
- affected 24969facd704a5f0dd8e08da86bf32a9ce972bee – < f38f8cce2f7e79775b3db7e8a5eacda04ac908e4
- affected 5.0
- unaffected < 5.0
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e48f4c3e3df35b34be719d72d737bbeaca77cf0c (opens in a new tab)
- https://git.kernel.org/stable/c/1cdeed9df1306f1a277e715600772640d63defa9 (opens in a new tab)
- https://git.kernel.org/stable/c/43a4d510523779891cf8eca7ffb4a086b0b5d8bf (opens in a new tab)
- https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107 (opens in a new tab)
- https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190 (opens in a new tab)
- https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485 (opens in a new tab)
- https://git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef (opens in a new tab)
- https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-53273 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-64579)Record last updated .