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Vulnerability record · CVE-2026-46094 · published 27 May 2026

CVE-2026-46094: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access The bounds check for the next xattr entry in check_xattrs() uses (void *)next >= end, which allows next to point within sizeof(u32) bytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4 bytes via *(__u32 *)(entry), which can overrun the valid xattr region. For example, if next lands at end - 1, the check passes since next < end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1, accessing 3 bytes beyond the valid region. Fix this by changing the check to (void *)next + sizeof(u32) > end, ensuring there is always enough space for the IS_LAST_ENTRY() read on the subsequent iteration.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.8% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
25 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access The bounds check for the next xattr entry in check_xattrs() uses (void *)next >= end, which allows next to point within sizeof(u32) bytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4 bytes via *(__u32 *)(entry), which can overrun the valid xattr region. For example, if next lands at end - 1, the check passes since next < end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1, accessing 3 bytes beyond the valid region. Fix this by changing the check to (void *)next + sizeof(u32) > end, ensuring there is always enough space for the IS_LAST_ENTRY() read on the subsequent iteration.

CVSS:3.1/AV:L/AC:L/PR:L/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/520986722dbf869c122252123fc161c7302eab7d Patch
https://git.kernel.org/stable/c/537e065977022aa22f2c2503e8accaf16622e0fd Patch
https://git.kernel.org/stable/c/5a5314d2387633a272a04d1bd8727f99058e4e68 Patch
https://git.kernel.org/stable/c/ab6da97bc310db35d4e4ef5354bc3ff626b0698c Patch
https://git.kernel.org/stable/c/eceafc31ea7b42c984ece10d79d505c0bb6615d5 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46094), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.