CVE-2026-31478

critical

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 th…

Vendor / product: Linux — linux kernel

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

9.8 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity source: NVD CVSS v3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Timeline (UTC)

Published: 2026-04-22 14:16

Modified: 2026-11-11 23:10

NVD status: Modified

Last synced 3 hours ago

Verified against the source API 2026-11-11 23:12 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linux / linux_kernel ≥5.15.145 <5.15.203, ≥6.1.71 <6.1.168, ≥6.6.1 <6.6.131, ≥6.7 <6.12.80, ≥6.13 <6.18.21, ≥6.19 <6.19.11

Weakness classification (CWE)

NVD-CWE-noinfo CWE-131

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Patch / mitigation: https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb

Patch / mitigation: https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861

Patch / mitigation: https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d

Patch / mitigation: https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361

Patch / mitigation: https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1

Patch / mitigation: https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5

Patch / mitigation: https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683

References

https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Data sources

NVD CVE API 2.0 — fetched 2026-11-11 23:12 UTC · record ↗

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CVE-2026-31478

Affected products

Weakness classification (CWE)

Mitigation & advisories

References

Data sources

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