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Vulnerability record · CVE-2026-46155 · published 28 May 2026

CVE-2026-46155: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

9.1 CVSS 3.1 Critical EPSS 0.65% · top 50.7% CWE-125 · Out-of-bounds read
9.1CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926 Patch
https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996b Patch
https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25f Patch
https://git.kernel.org/stable/c/a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c Patch
https://git.kernel.org/stable/c/dffb44b2e06a2908e249f0f93156fc987eee1d1c Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46155), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.