CVE-2026-64579 Affecting kernel-azure-extra package, versions <6.12.0-160000.38.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SLES1600-KERNELAZUREEXTRA-20320509
- published30 Sept 2026
- disclosed22 Sept 2026
Introduced: 22 Sep 2026
NewCVE-2026-64579 (opens in a new tab)How to fix?
Upgrade SLES:16.0.0 kernel-azure-extra to version 6.12.0-160000.38.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-azure-extra package and not the kernel-azure-extra package as distributed by SLES.
See How to fix? for SLES:16.0.0 relevant fixed versions and status.
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
References
- https://www.suse.com/security/cve/CVE-2026-64579.html
- https://bugzilla.suse.com/1274036
- https://git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef
- https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485
- https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190
- https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107
- https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4
- https://git.kernel.org/stable/c/1cdeed9df1306f1a277e715600772640d63defa9
- https://git.kernel.org/stable/c/43a4d510523779891cf8eca7ffb4a086b0b5d8bf
- https://git.kernel.org/stable/c/e48f4c3e3df35b34be719d72d737bbeaca77cf0c