What is CVE-2026-31449?

CVE-2026-31449 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 2.6.19 onward and patched in 5.10.259, 5.15.210, 6.1.175 and others. CVE-2026-31449 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31449?

CVE-2026-31449 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31449?

Yes, CVE-2026-31449 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.175 and others. If you are running Linux kernel 2.6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31449 actively exploited?

CVE-2026-31449 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2026-31449

High

In the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_correct_indexes() walks up the extent tree correcting index entries when the first extent in a leaf is modified. Before accessing path[k].p_idx->ei_block, there is no validation that p_idx falls within the valid range of index entries for that level. If the on-disk extent header contains a corrupted or crafted eh_entries value, p_idx can point past the end of the allocated buffer, causing a slab-out-of-bounds read. Fix this by validating path[k].p_idx against EXT_LAST_INDEX() at both access sites: before the while loop and inside it. Return -EFSCORRUPTED if the index pointer is out of range, consistent with how other bounds violations are handled in the ext4 extent tree code.

Package Linux Kernel

Published 2026-04-22

Last modified 2026-06-19

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2026-31449 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.19 and later are affected. Fixed in 5.10.259, 5.15.210, 6.1.175, 6.6.140, 6.12.80, 6.18.21, 6.19.11, 7.0 and their respective stable series.

Affected from

≥ 2.6.19

Fixed in

✓ 5.10.259 5.10.x ✓ 5.15.210 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.140 6.6.x ✓ 6.12.80 6.12.x ✓ 6.18.21 6.18.x ✓ 6.19.11 6.19.x ✓ 7.0

References

8 total

Kernel Git
https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33

Patch
Kernel Git
https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8

Patch
Kernel Git
https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1

Patch
Kernel Git
https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83

Patch
Kernel Git
https://git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-31449

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-04-22

Modified 2026-06-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31449?

CVE-2026-31449 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 2.6.19 onward and has been patched in 5.10.259, 5.15.210, 6.1.175 and others. CVE-2026-31449 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31449?

CVE-2026-31449 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31449?

Yes. CVE-2026-31449 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.175 and others. If you are running Linux kernel 2.6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31449 actively exploited?

No. CVE-2026-31449 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.