CVE-2026-64579: linux
Vulnerability summary
CVE-2026-64579 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 24 · Related 20Timeline
- 05-08-2026PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
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
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
6%
Versus all other CVEs
30-day change
0.00 pp
From 0.17% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu165 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
- linux-6.12< 6.12.101-1~deb12u1
Linux1 product
- linux≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < e48f4c3e3df35b34be719d72d737bbeaca77cf0c | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < 1cdeed9df1306f1a277e715600772640d63defa9 | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < 43a4d510523779891cf8eca7ffb4a086b0b5d8bf | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < d9d9cc21cc90014724a14c447e3d587be9447107 | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < 94c00391a5117530188334f740ce26d3f1256190 | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < 7acc5ed2f33608a3d83b64f50a5766843b6e2485 | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < 6aa3796d18a9fda953ad76a62b57bf6c145cb9ef | ≥ 24969facd704a5f0dd8e08da86bf32a9ce972bee, < f38f8cce2f7e79775b3db7e8a5eacda04ac908e4 | 5.0
3 vendors · 168 products
