CVE-2026-46185

smb/client: fix out-of-bounds read in symlink_data()

State: Published
Severity: 9.1 Critical
Published: May 28, 2026
Updated: Oct 19, 2026
Reserved: May 13, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

smb/client: fix out-of-bounds read in symlink_data()

Since smb2_check_message() returns success without length validation for the symlink error response, in symlink_data() it is possible for iov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer only contains the base SMB2 header (64 bytes), accessing err->ErrorContextCount (at offset 66) or err->ByteCount later in symlink_data() will cause an out-of-bounds read.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	76894f3e2f71177747b8b4763fb180e800279585 to before 2be11faf79e49fb8250a181ff0b4d2b2f084af83Affected 76894f3e2f71177747b8b4763fb180e800279585 to before ef6495d4df6e7af8f3de67e65150881c880f696cAffected 76894f3e2f71177747b8b4763fb180e800279585 to before 15dc0a4de743a1aaa7b859b3aea79f08c695396cAffected 76894f3e2f71177747b8b4763fb180e800279585 to before b8c8a704f0bc133deb171f6aeb6f3a684203e212Affected 76894f3e2f71177747b8b4763fb180e800279585 to before b9561402489d41149f63e001a74384863b7b30a6Affected 76894f3e2f71177747b8b4763fb180e800279585 to before d62b8d236fab503c6fec1d3e9a38bea71feaca20Affected 2d046892a493d9760c35fdaefc3017f27f91b621Affected 6.0.16 to before 6.1Affected
LinuxLinux	6.1Affected before 6.1Not affected 6.1.175 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.88 through 6.12.Not affected 6.18.30 through 6.18.Not affected 7.0.7 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

76894f3e2f71177747b8b4763fb180e800279585 to before 2be11faf79e49fb8250a181ff0b4d2b2f084af83Affected
76894f3e2f71177747b8b4763fb180e800279585 to before ef6495d4df6e7af8f3de67e65150881c880f696cAffected
76894f3e2f71177747b8b4763fb180e800279585 to before 15dc0a4de743a1aaa7b859b3aea79f08c695396cAffected
76894f3e2f71177747b8b4763fb180e800279585 to before b8c8a704f0bc133deb171f6aeb6f3a684203e212Affected
76894f3e2f71177747b8b4763fb180e800279585 to before b9561402489d41149f63e001a74384863b7b30a6Affected
76894f3e2f71177747b8b4763fb180e800279585 to before d62b8d236fab503c6fec1d3e9a38bea71feaca20Affected
2d046892a493d9760c35fdaefc3017f27f91b621Affected
6.0.16 to before 6.1Affected

LinuxLinux

6.1Affected
before 6.1Not affected
6.1.175 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.88 through 6.12.*Not affected
6.18.30 through 6.18.*Not affected
7.0.7 through 7.0.*Not affected
7.1 and laterNot affected

References

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