CVE-2026-64579None▾ SunlitIn 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 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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
Linux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < e48f4c3e3df35b34be719d72d737bbeaca77cf0cLinux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < 1cdeed9df1306f1a277e715600772640d63defa9Linux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < 43a4d510523779891cf8eca7ffb4a086b0b5d8bfLinux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < d9d9cc21cc90014724a14c447e3d587be9447107Linux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < 94c00391a5117530188334f740ce26d3f1256190Linux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < 7acc5ed2f33608a3d83b64f50a5766843b6e2485Linux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < 6aa3796d18a9fda953ad76a62b57bf6c145cb9efLinux >= 24969facd704a5f0dd8e08da86bf32a9ce972bee < f38f8cce2f7e79775b3db7e8a5eacda04ac908e4Linux 5.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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