CVE-2026-64579xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert
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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: 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
- CVSS
- Not yet scored
- 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
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 24969facd704a5f0dd8e08da86bf32a9ce972bee before e48f4c3e3df35b34be719d72d737bbeaca77cf0c; 24969facd704a5f0dd8e08da86bf32a9ce972bee builds before 1cdeed9df1306f1a277e715600772640d63defa9; 24969facd704a5f0dd8e08da86bf32a9ce972bee builds before 43a4d510523779891cf8eca7ffb4a086b0b5d8bf; from 24969facd704a5f0dd8e08da86bf32a9ce972bee before d9d9cc21cc90014724a14c447e3d587be9447107; 24969facd704a5f0dd8e08da86bf32a9ce972bee builds before 94c00391a5117530188334f740ce26d3f1256190; 24969facd704a5f0dd8e08da86bf32a9ce972bee builds before 7acc5ed2f33608a3d83b64f50a5766843b6e2485; 24969facd704a5f0dd8e08da86bf32a9ce972bee builds before 6aa3796d18a9fda953ad76a62b57bf6c145cb9ef; from 24969facd704a5f0dd8e08da86bf32a9ce972bee before f38f8cce2f7e79775b3db7e8a5eacda04ac908e4 | CNA record |
References
- https://git.kernel.org/stable/c/e48f4c3e3df35b34be719d72d737bbeaca77cf0c
- https://git.kernel.org/stable/c/1cdeed9df1306f1a277e715600772640d63defa9
- https://git.kernel.org/stable/c/43a4d510523779891cf8eca7ffb4a086b0b5d8bf
- https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107
- https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190
- https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485
- https://git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef
- https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4
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.