ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
Summary
| CVE | CVE-2026-31478 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-04-22 14:16:44 UTC |
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| Updated | 2026-04-22 14:16:44 UTC |
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| Description | 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected f2283680a80571ca82d710bc6ecd8f8beac67d63 70b4c414889492c522b6e4331562360f49be2361 git |
Not specified |
| CNA |
Linux |
Linux |
affected 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 9a7166f0ef8cbb7bb48dd05e2471d995566003f5 git |
Not specified |
| CNA |
Linux |
Linux |
affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 git |
Not specified |
| CNA |
Linux |
Linux |
affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 6aef1765d6807e0f027cd87f6ac973eb0879a46d git |
Not specified |
| CNA |
Linux |
Linux |
affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 80824c7e527b70cf9039534e60aff592e8f209d1 git |
Not specified |
| CNA |
Linux |
Linux |
affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 4cb537ae4f37d7d0f617815ed4bed7173fb50861 git |
Not specified |
| CNA |
Linux |
Linux |
affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 0e55f63dd08f09651d39e1b709a91705a8a0ddcb git |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.203 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.168 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.131 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.80 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.21 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.19.11 6.19.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.0 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.
