CVE-2026-89634

CVE CVE-2026-89634EUVD EUVD-2026-76546Published 2026-09-11T19:45:28.000ZLast changed 2026-09-14T12:01:40.000ZCVSS 9.1

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix ALIGN() overflow in symlink_data() error context loop The check added by commit 7d9a7f1f96cd ("smb/client: fix possible infinite loop and oob read in symlink_data()") compared the post-ALIGN length against the remaining buffer, but ALIGN() itself can overflow: for ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8) wraps to 0, so the subsequent bounds check passes, and the loop advances by zero bytes leaving 'p' pointing into stale data. Fix by checking the raw ErrorDataLength against the remaining space before applying ALIGN(), then checking again after. Since raw_len is bounded by the buffer, raw_len + 7 cannot overflow, so the second check is an exact post-alignment bounds guard.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 76894f3e2f71177747b8b4763fb180e800279585 <62a3025983c8c735a3c6fc85a59316f31b59af07; 6.1; patch: 7.3-rc1; patch: 6.6.157; patch: 0; patch: 7.2.4; patch: 6.12.109; 76894f3e2f71177747b8b4763fb180e800279585 <657372ba6ea50b4474d2a6a610097eae8cd1f3e9; 2d046892a493d9760c35fdaefc3017f27f91b621; 76894f3e2f71177747b8b4763fb180e800279585 <b89d678f9eafcf8d74885983166ba26b40a04ea0; patch: 6.1.188; 76894f3e2f71177747b8b4763fb180e800279585 <1f824f61d1df52392eaf0b74dfa5659d724fde30; patch: 6.18.50; 6.0.16 <6.1; 76894f3e2f71177747b8b4763fb180e800279585 <2b4a25baa0b936fef6915c0459925077b324ecaf; 76894f3e2f71177747b8b4763fb180e800279585 <62656b024efc21c3230eade1a847f25871c3d2bb

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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