CVE-2026-46094 Details
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.
A vulnerability in the Linux kernel's ext4 file system allows for out-of-bounds access in the handling of extended attributes (xattrs). The issue arises in the check_xattrs() function, where the bounds check for the next xattr entry is insufficient. It permits the next pointer to approach within sizeof(u32) bytes of the end of the valid xattr region. This flaw can be exploited in the following loop iteration, where the IS_LAST_ENTRY() macro reads 4 bytes from an entry pointer that may have been moved beyond the valid range, potentially overwriting critical data or causing a crash.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been patched. Instructions for downloading the updated kernel can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/520986722dbf869c122252123fc161c7302eab7d | kernel.org | Patch |
| https://git.kernel.org/stable/c/537e065977022aa22f2c2503e8accaf16622e0fd | kernel.org | Patch |
| https://git.kernel.org/stable/c/5a5314d2387633a272a04d1bd8727f99058e4e68 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ab6da97bc310db35d4e4ef5354bc3ff626b0698c | kernel.org | Patch |
| https://git.kernel.org/stable/c/eceafc31ea7b42c984ece10d79d505c0bb6615d5 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.3, < 6.6.140 >= 6.7, < 6.12.86 >= 6.13, < 6.18.27 >= 6.19, < 7.0.4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 25, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 27, 2026 | New CVE Received | kernel.org |