CVE-2026-89761 Affecting kernel-livepatch-6_4_0-150700_53_90-default package, versions <1-150700.15.3.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES157-KERNELLIVEPATCH6401507005390DEFAULT-22234979
- published5 Nov 2026
- disclosed3 Nov 2026
Introduced: 3 Nov 2026
NewCVE-2026-89761 (opens in a new tab)How to fix?
Upgrade SLES:15.7 kernel-livepatch-6_4_0-150700_53_90-default to version 1-150700.15.3.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-6_4_0-150700_53_90-default package and not the kernel-livepatch-6_4_0-150700_53_90-default package as distributed by SLES.
See How to fix? for SLES:15.7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
apparmor: fix out-of-bounds write when null terminating a label vec
aa_vec_unique() null terminates at vec[n - dups] when VEC_FLAG_TERMINATE is passed. If the components are all distinct no duplicates are dropped, dups is 0 and the terminator goes to vec[n], so the caller has to provide room for n + 1 entries.
aa_label_strn_parse() sets up its vector with vec_setup(profile, vec, len, gfp) and then calls aa_vec_unique(vec, len, VEC_FLAG_TERMINATE), but vec_setup() does not reserve the terminator entry. Up to LOCAL_VEC_ENTRIES it uses the local array of LOCAL_VEC_ENTRIES pointers, above that it allocates exactly len pointers. The terminator therefore lands one entry past the end of the local array when len is LOCAL_VEC_ENTRIES, and one entry past the end of the allocation when len is larger.
len comes from the number of "//&" separated components in the label name and label_count_strn_entries() does not bound it. An unprivileged task reaches the parse by writing to /proc/self/attr/apparmor/current or through lsm_set_self_attr(2), both of which go through do_setattr(), and the name is parsed before the change_profile permission is checked. The query_label() path behind the securityfs .access file, which is mode 0666, performs no permission check at all. Every component has to resolve to a loaded profile, so a system with policy loaded is required.
The other two VEC_FLAG_TERMINATE users work on a label vec that aa_label_alloc() has already sized with "+ 1 for null terminator entry on vec". Reserve the same entry in vec_setup() and DEFINE_VEC(). Passing len + 1 from the caller instead would move len == LOCAL_VEC_ENTRIES out of the local array and into kzalloc().
References
- https://www.suse.com/security/cve/CVE-2026-89761.html
- https://bugzilla.suse.com/1280745
- https://git.kernel.org/stable/c/28069434aef66b9d084f0609b7a29c171846815e
- https://git.kernel.org/stable/c/36bdd0b45ec3f4822832a56e9db8674c8450dfce
- https://git.kernel.org/stable/c/9124e078ea2250d8d01d2162a550acb01ef5bf48
- https://git.kernel.org/stable/c/9f1e40193eef7f047e6b77cfb4b4cafdecd7a123
- https://git.kernel.org/stable/c/b17c8f5dcb36a032688847b2bce4bd813b4baad1
- https://git.kernel.org/stable/c/0d4cb3af82556afc48f90fd3e8a126ff32343f41
- https://git.kernel.org/stable/c/40fdee1cb4f18e6a1a21a891ae4735bcd4d35026
- https://git.kernel.org/stable/c/57bb24025f450728f342d8e08cd3909c89361d90