What’s Vulnerable › Vulnerabilities

CVE-2026-46185: smb/client: fix out-of-bounds read in symlink_data()

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-10-19
• Weakness: CWE-125

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.

Affected products

• Linux kernel: from 6.0.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1-rc1, 7.1-rc2 — fixed in 6.1.175, 6.12.88, 6.18.30, 6.6.140, 7.0.7

How to fix

Upgrade to a fixed version: Linux kernel 6.1.175, 6.12.88, 6.18.30, 6.6.140. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/15dc0a4de743a1aaa7b859b3aea79f08c695396c
• https://git.kernel.org/stable/c/2be11faf79e49fb8250a181ff0b4d2b2f084af83
• https://git.kernel.org/stable/c/b8c8a704f0bc133deb171f6aeb6f3a684203e212
• https://git.kernel.org/stable/c/b9561402489d41149f63e001a74384863b7b30a6
• https://git.kernel.org/stable/c/d62b8d236fab503c6fec1d3e9a38bea71feaca20
• https://git.kernel.org/stable/c/ef6495d4df6e7af8f3de67e65150881c880f696c
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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