CVE-2026-31478
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
After this commit (e2b76ab8b5c9 "ksmbd: add support for read compound"), response buffer management was changed to use dynamic iov array. In the new design, smb2_calc_max_out_buf_len() expects the second argument (hdr2_len) to be the offset of ->Buffer field in the response structure, not a hardcoded magic number. Fix the remaining call sites to use the correct offsetof() value.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f2283680a80571ca82d710bc6ecd8f8beac67d63 < 70b4c414889492c522b6e4331562360f49be2361 | affected |
| Linux | Linux | 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 < 9a7166f0ef8cbb7bb48dd05e2471d995566003f5 | affected |
| Linux | Linux | e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 | affected |
| Linux | Linux | e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 6aef1765d6807e0f027cd87f6ac973eb0879a46d | affected |
| Linux | Linux | e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 80824c7e527b70cf9039534e60aff592e8f209d1 | affected |
| Linux | Linux | e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 4cb537ae4f37d7d0f617815ed4bed7173fb50861 | affected |
| Linux | Linux | e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 0e55f63dd08f09651d39e1b709a91705a8a0ddcb | affected |
| Linux | Linux | 5.15.145 < 5.15.203 | affected |
| Linux | Linux | 6.1.71 < 6.1.168 | affected |
| Linux | Linux | 6.6 | affected |
| Linux | Linux | 0 < 6.6 | unaffected |
| Linux | Linux | 5.15.203 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.168 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.131 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.80 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.21 <= 6.18.* | unaffected |
| Linux | Linux | 6.19.11 <= 6.19.* | unaffected |
| Linux | Linux | 7.0 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361
- https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5
- https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683
- https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d
- https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1
- https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861
- https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb
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