CVE-2026-64579 (GCVE-0-2026-64579)
Vulnerability from cvelistv5
Published
2026-08-05 08:09
Modified
2026-08-19 16:29
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee Version: 24969facd704a5f0dd8e08da86bf32a9ce972bee |
||
{
"containers": {
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{
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"product": "Linux",
"programFiles": [
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{
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"version": "6.1.183",
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},
{
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"version": "6.6.148",
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],
"cpeApplicability": [
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],
"negate": false,
"operator": "OR"
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert\n\nxfrm_hash_rebuild()\u0027s first loop preallocates the bins/chains the reinsert\nloop needs, so the reinsert (after hlist_del_rcu()) cannot allocate or\nfail. But its guard is inverted: it skips policies with prefixlen \u003c\nthreshold and preallocates for the rest.\n\nprefixlen \u003c threshold is exactly when policy_hash_bysel() returns NULL and\nthe reinsert takes the allocating xfrm_policy_inexact_insert() path. So the\nloop preallocates for the exact policies (which never allocate) and skips\nthe inexact ones, whose bin/node is then allocated GFP_ATOMIC during\nreinsert. On failure the error path only WARN_ONCE()s and continues,\nleaving a poisoned bydst node; the next rebuild\u0027s hlist_del_rcu()\ndereferences LIST_POISON2 and takes a GPF. Reachable under memory pressure,\ndeterministic via failslab.\n\nInvert the guard so preallocation covers exactly the reinserted policies;\nthe reinsert then allocates nothing and cannot fail.\n\nCrash:\n Oops: general protection fault, probably for non-canonical address\n 0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI\n KASAN: maybe wild-memory-access in range [0xdead...]\n ...\n Workqueue: events xfrm_hash_rebuild\n RIP: 0010:xfrm_hash_rebuild+0x5b3/0x1190\n RAX: dead000000000122 (LIST_POISON2 + offset)\n ...\n Call Trace:\n hlist_del_rcu (include/linux/rculist.h:599)\n xfrm_hash_rebuild (net/xfrm/xfrm_policy.c:1365)\n process_one_work (kernel/workqueue.c:3322)\n worker_thread (kernel/workqueue.c:3486)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n ...\n Kernel panic - not syncing: Fatal exception in interrupt"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:29:04.594Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e48f4c3e3df35b34be719d72d737bbeaca77cf0c"
},
{
"url": "https://git.kernel.org/stable/c/1cdeed9df1306f1a277e715600772640d63defa9"
},
{
"url": "https://git.kernel.org/stable/c/43a4d510523779891cf8eca7ffb4a086b0b5d8bf"
},
{
"url": "https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107"
},
{
"url": "https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190"
},
{
"url": "https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485"
},
{
"url": "https://git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef"
},
{
"url": "https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4"
}
],
"title": "xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64579",
"datePublished": "2026-08-05T08:09:34.346Z",
"dateReserved": "2026-07-19T15:36:31.798Z",
"dateUpdated": "2026-08-19T16:29:04.594Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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