High 7.1Published Apr 24, 2026

CVE-2026-31614smb: client: fix off-by-8 bounds check in check_wsl_eas()

Updated under an hour ago (Oct 28, 2026, 5:00 AM ET)

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In the Linux kernel, the following vulnerability has been resolved: smb: client: fix off-by-8 bounds check in check_wsl_eas() The bounds check uses (u8 *)ea + nlen + 1 + vlen as the end of the EA name and value, but ea_data sits at offset sizeof(struct smb2_file_full_ea_info) = 8 from ea, not at offset 0. The strncmp() later reads ea->ea_data[0..nlen-1] and the value bytes follow at ea_data[nlen+1..nlen+vlen], so the actual end is ea->ea_data + nlen + 1 + vlen. Isn't pointer math fun? The earlier check (u8 *)ea > end - sizeof(*ea) only guarantees the 8-byte header is in bounds, but since the last EA is placed within 8 bytes of the end of the response, the name and value bytes are read past the end of iov. Fix this mess all up by using ea->ea_data as the base for the bounds check. An "untrusted" server can use this to leak up to 8 bytes of kernel heap into the EA name comparison and influence which WSL xattr the data is interpreted as.

CVSS: 7.1 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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: Jun 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7449d736bbbd160c76b01b8fcdf72f58a8757d4b before bfbc74df8bbe095b3ed68f6d4487b368af087890; from ea41367b2a602f602ea6594fc4a310520dcc64f4 before 5cc0574c84aa73946ade587c41e81757b8b01cb5; from ea41367b2a602f602ea6594fc4a310520dcc64f4 before b2b76d09a64c538c57006180103fc1841e8cfa66; from ea41367b2a602f602ea6594fc4a310520dcc64f4 before ba3ad159aa61810bbe0acaf39578b1ebfb6f1a18; from ea41367b2a602f602ea6594fc4a310520dcc64f4 before a893f1757d9a4009e4a8d7ceb2312142fe29cea4; from ea41367b2a602f602ea6594fc4a310520dcc64f4 before 3d8b9d06bd3ac4c6846f5498800b0f5f8062e53b; from 6.6.32 before 6.6.136	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.32 before 6.6.136; from 6.9 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1	NVD

References

References

https://git.kernel.org/stable/c/bfbc74df8bbe095b3ed68f6d4487b368af087890	patch
https://git.kernel.org/stable/c/5cc0574c84aa73946ade587c41e81757b8b01cb5	patch
https://git.kernel.org/stable/c/b2b76d09a64c538c57006180103fc1841e8cfa66	patch
https://git.kernel.org/stable/c/ba3ad159aa61810bbe0acaf39578b1ebfb6f1a18	patch
https://git.kernel.org/stable/c/a893f1757d9a4009e4a8d7ceb2312142fe29cea4	patch
https://git.kernel.org/stable/c/3d8b9d06bd3ac4c6846f5498800b0f5f8062e53b	patch

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.