CVE-2026-31478ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f2283680a80571ca82d710bc6ecd8f8beac67d63 before 70b4c414889492c522b6e4331562360f49be2361; 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 builds before 9a7166f0ef8cbb7bb48dd05e2471d995566003f5; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 6aef1765d6807e0f027cd87f6ac973eb0879a46d; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 80824c7e527b70cf9039534e60aff592e8f209d1; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 4cb537ae4f37d7d0f617815ed4bed7173fb50861; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 0e55f63dd08f09651d39e1b709a91705a8a0ddcb; from 5.15.145 before 5.15.203; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15.145 before 5.15.203; from 6.1.71 before 6.1.168; from 6.6.1 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 6.6; 7.0; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361patch
- https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5patch
- https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683patch
- https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46dpatch
- https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1patch
- https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861patch
- https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcbpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.