CVE-2026-31478
published 2026-04-22CVE-2026-31478: 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…
PriorityP346critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.50%
39.6th percentile
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
63 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 5.15.145 < 5.15.203 | 5.15.203 |
| linux | linux | >= 6.1.71 < 6.1.168 | 6.1.168 |
| linux | linux | >= 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 < 9a7166f0ef8cbb7bb48dd05e2471d995566003f5 | 9a7166f0ef8cbb7bb48dd05e2471d995566003f5 |
| linux | linux | >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 | c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 |
| linux | linux | >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 6aef1765d6807e0f027cd87f6ac973eb0879a46d | 6aef1765d6807e0f027cd87f6ac973eb0879a46d |
| linux | linux | >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 80824c7e527b70cf9039534e60aff592e8f209d1 | 80824c7e527b70cf9039534e60aff592e8f209d1 |
| linux | linux | >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 4cb537ae4f37d7d0f617815ed4bed7173fb50861 | 4cb537ae4f37d7d0f617815ed4bed7173fb50861 |
| linux | linux | >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 0e55f63dd08f09651d39e1b709a91705a8a0ddcb | 0e55f63dd08f09651d39e1b709a91705a8a0ddcb |
| linux | linux | >= f2283680a80571ca82d710bc6ecd8f8beac67d63 < 70b4c414889492c522b6e4331562360f49be2361 | 70b4c414889492c522b6e4331562360f49be2361 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.15.145 < 5.15.203 | 5.15.203 |
| linux | linux_kernel | >= 6.1.71 < 6.1.168 | 6.1.168 |
| linux | linux_kernel | >= 6.13 < 6.18.21 | 6.18.21 |
| linux | linux_kernel | >= 6.19 < 6.19.11 | 6.19.11 |
| linux | linux_kernel | >= 6.6.1 < 6.6.131 | 6.6.131 |
| linux | linux_kernel | >= 6.7 < 6.12.80 | 6.12.80 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-5.15 | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
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- SPI subsystem;
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- ACPI drivers;
- ATM drivers;
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Red Hat
kernel: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
vendor_redhat·2026-04-22
CVE-2026-31478 CWE-131 kernel: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
kernel: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
A flaw was found in ksmbd within the Linux kernel. This vulnerability occurs due to an incorrect calculation of the response buffer length in the `smb2_calc_max_out_buf_len()` function. The function used a hardcoded value instead of the proper offset, which could lead to issues in how response buffers are managed.
Package: kernel (Red Hat Enterprise Linux 10) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 8) - Not affected
Package: kernel (Red
VulDB
Linux Kernel up to 6.19.10 ksmbd offsetof buffer overflow (WID-SEC-2026-1252)
vuldb·2026-06-17·CVSS 9.8
CVE-2026-31478 [CRITICAL] Linux Kernel up to 6.19.10 ksmbd offsetof buffer overflow (WID-SEC-2026-1252)
A vulnerability described as critical has been identified in Linux Kernel up to 6.19.10. This affects the function offsetof of the component ksmbd. Executing a manipulation can lead to buffer overflow.
This vulnerability appears as CVE-2026-31478. The attacker needs to be present on the local network. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
GHSA-hjcf-h98x-x745: In the Linux kernel, the following vulnerability has been resolved:
ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
ghsa_unreviewed·2026-04-22
CVE-2026-31478 GHSA-hjcf-h98x-x745: In the Linux kernel, the following vulnerability has been resolved:
ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
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.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcbhttps://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46dhttps://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683
2026-04-22
Published