xfrm: use hlist_del_init_rcu for state_cache and state_cache_input
Summary
| CVE | CVE-2026-98230 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-10-06 09:18:10 UTC |
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| Updated | 2026-10-06 09:18:10 UTC |
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| Description | In the Linux kernel, the following vulnerability has been resolved:
xfrm: use hlist_del_init_rcu for state_cache and state_cache_input
Commit 14acf9652e56 ("xfrm: defensively unhash xfrm_state lists in
__xfrm_state_delete") converted bydst/bysrc/byseq/byspi from
hlist_del_rcu() to hlist_del_init_rcu() so that a second
__xfrm_state_delete() on the same object becomes a no-op rather than a
write through LIST_POISON pprev. It missed state_cache and
state_cache_input, which kept hlist_del_rcu():
- hlist_del_rcu() leaves pprev = LIST_POISON2 (non-NULL), so
hlist_unhashed() returns false.
- hlist_del_init_rcu() leaves pprev = NULL, so hlist_unhashed()
returns true.
A second __xfrm_state_delete() therefore enters __hlist_del() on the
already-deleted state_cache/state_cache_input nodes and does
WRITE_ONCE(*pprev, next) through LIST_POISON2 — a write use-after-free
once the slab is reused. The corruption can in turn cause a subsequent
hlist_for_each_entry_rcu traversal to follow a dangling next pointer,
producing the read use-after-free reported in xfrm_input_state_lookup().
Switch state_cache and state_cache_input to hlist_del_init_rcu() to
match the other four lists, closing the write use-after-free and, with
it, the read use-after-free it spawns. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected aa48a18fdb0911572d133057cd579db704b87da4 fb38fb7420d5f7192f9e2b6ac835ede149cd7ac5 git |
Not specified |
| CNA |
Linux |
Linux |
affected 0045e3d80613cc7174dc15f189ee6fc4e73b9365 4748c27e2e6a1969e02f1df46e62f79d2799b80b git |
Not specified |
| CNA |
Linux |
Linux |
affected 0045e3d80613cc7174dc15f189ee6fc4e73b9365 9b74a47a4cbd0d29faff4f3b199212c73e6b6220 git |
Not specified |
| CNA |
Linux |
Linux |
affected 0045e3d80613cc7174dc15f189ee6fc4e73b9365 2afb8dc1f4390f164db8352f8e685e126e9db566 git |
Not specified |
| CNA |
Linux |
Linux |
affected 5e4334dc39443645415450163ff5ff1ee7e79784 git |
Not specified |
| CNA |
Linux |
Linux |
affected 6.12.13 6.12.112 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.13 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.13 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.112 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.54 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.8 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc4 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/4748c27e2e6a1969e02f1df46e62f79d2799b80b |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/9b74a47a4cbd0d29faff4f3b199212c73e6b6220 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/2afb8dc1f4390f164db8352f8e685e126e9db566 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/fb38fb7420d5f7192f9e2b6ac835ede149cd7ac5 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.