What is CVE-2026-31431?

CVE-2026-31431 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 4.14 onward and patched in 5.10.254, 5.15.204, 6.1.170 and others. CVE-2026-31431 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild.

What is the CVSS score for CVE-2026-31431?

CVE-2026-31431 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:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31431?

Yes, CVE-2026-31431 has been patched. Fixed versions include 5.10.254, 5.15.204, 6.1.170 and others. If you are running Linux kernel 4.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31431 actively exploited?

Yes — CVE-2026-31431 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild with a CVSS score of 7.8 (High severity).

CVE-2026-31431

High KEV — Actively Exploited

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Package Linux Kernel

Published 2026-04-22

Last modified 2026-05-21

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

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-669

CVE-2026-31431 is classified as CWE-669

See CWE-669 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.14 and later are affected. Fixed in 5.10.254, 5.15.204, 6.1.170, 6.6.137, 6.12.85, 6.18.22, 6.19.12, 7.0 and their respective stable series.

Affected from

≥ 4.14

Fixed in

✓ 5.10.254 5.10.x ✓ 5.15.204 5.15.x ✓ 6.1.170 6.1.x ✓ 6.6.137 6.6.x ✓ 6.12.85 6.12.x ✓ 6.18.22 6.18.x ✓ 6.19.12 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31431 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Openwall
http://www.openwall.com/lists/oss-security/2026/04/30/17

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/04/30/18

Exploit Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/04/30/2

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/04/30/20

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/04/30/6

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/10

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/12

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/15

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/16

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/17

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/18

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/2

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/22

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/23

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/24

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/01/3

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/14

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/15

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/16

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/17

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/18

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/19

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/20

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/21

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/23

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/24

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/25

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/4

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/5

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/6

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/7

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/02/8

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/10

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/12

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/13

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/3

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/4

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/5

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/03/6

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/1

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/10

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/11

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/12

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/13

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/14

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/2

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/24

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/27

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/28

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/29

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/31

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/8

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/04/9

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/06/5

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/07/12

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/07/2

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/08/13

Mailing List
Openwall
http://www.openwall.com/lists/oss-security/2026/05/18/3

Mailing List
Copy
https://copy.fail

Exploit
Websec
https://websec.net/blog/cve-2026-31431-linux-algifaead-page-cache-write-to-root-69f38a4ccddd2db1f520f170

Exploit Third Party Advisory
Kb
https://www.kb.cert.org/vuls/id/260001

Third Party Advisory
Red Hat
https://access.redhat.com/security/cve/cve-2026-31431#cve-details-mitigation

Third Party Advisory
Cert-Portal
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Third Party Advisory
Cert-Portal
https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Third Party Advisory
GitHub
https://github.com/theori-io/copy-fail-CVE-2026-31431

Exploit
Kernel.org
https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/

Vendor Advisory
CISA
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-31431

US Government Resource
Kernel patch commit
https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc
Patch
Kernel patch commit
https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667
Patch

19 patch commits total View all on NVD

Details

CVE ID CVE-2026-31431

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-04-22

Modified 2026-05-21

KEV Yes

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31431?

CVE-2026-31431 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.14 onward and has been patched in 5.10.254, 5.15.204, 6.1.170 and others. CVE-2026-31431 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild.
What is the CVSS score for CVE-2026-31431?

CVE-2026-31431 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:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31431?

Yes — CVE-2026-31431 has been patched. Fixed versions include 5.10.254, 5.15.204, 6.1.170 and others. If you are running Linux kernel 4.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31431 actively exploited?

Yes — CVE-2026-31431 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. It carries a CVSS score of 7.8 (High severity).