Vulnerability details
CVE-2026-89634
smb: client: fix ALIGN() overflow in symlink_data() error context loop
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 2d046892a493d9760c35fdaefc3017f27f91b621 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.1 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.0.16 ≤ v < 6.1 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 76894f3e2f71177747b8b4763fb180e800279585 ≤ v < 1f824f61d1df52392eaf0b74dfa5659d724fde30 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 76894f3e2f71177747b8b4763fb180e800279585 ≤ v < 2b4a25baa0b936fef6915c0459925077b324ecaf | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 76894f3e2f71177747b8b4763fb180e800279585 ≤ v < 62656b024efc21c3230eade1a847f25871c3d2bb | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 76894f3e2f71177747b8b4763fb180e800279585 ≤ v < 62a3025983c8c735a3c6fc85a59316f31b59af07 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 76894f3e2f71177747b8b4763fb180e800279585 ≤ v < b89d678f9eafcf8d74885983166ba26b40a04ea0 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 76894f3e2f71177747b8b4763fb180e800279585 ≤ v < 657372ba6ea50b4474d2a6a610097eae8cd1f3e9 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://git.kernel.org/stable/c/2b4a25baa0b936fef6915c0459925077b324ecaf
- https://git.kernel.org/stable/c/b89d678f9eafcf8d74885983166ba26b40a04ea0
- https://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9
- https://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30
- https://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07
- https://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb
Details
- Published
- 2026-09-11
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
Weaknesses (CWE)
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