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CVE-2026-31431

high

Description

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.

From the Tenable Blog

Copy Fail (CVE-2026-31431): Linux Kernel Privilege Escalation FAQ | Tenable®
Copy Fail (CVE-2026-31431): Linux Kernel Privilege Escalation FAQ | Tenable®

Published: 2026-04-30

CVE-2026-31431 (Copy Fail) is a Linux kernel local privilege escalation flaw with a public PoC affecting all major distributions since 2017. Patches available.

References

https://www.kb.cert.org/vuls/id/260001

https://cert-portal.siemens.com/productcert/html/ssa-265688.html

https://cert-portal.siemens.com/productcert/html/ssa-082556.html

https://access.redhat.com/security/cve/cve-2026-31431#cve-details-mitigation

https://thehackernews.com/2026/05/linux-kernel-dirty-frag-lpe-exploit.html

https://securityaffairs.com/191629/hacking/u-s-cisa-adds-a-flaw-in-linux-kernel-to-its-known-exploited-vulnerabilities-catalog.html

https://thehackernews.com/2026/05/cisa-adds-actively-exploited-linux-root.html

https://www.cisa.gov/news-events/alerts/2026/05/01/cisa-adds-one-known-exploited-vulnerability-catalog

https://therecord.media/linux-vulnerability-copy-fail-patch

https://www.helpnetsecurity.com/2026/04/30/copyfail-linux-lpe-vulnerability-cve-2026-31431/

https://www.infosecurity-magazine.com/news/fragnesia-linux-kernel-lpe-root/

https://aws.amazon.com/security/security-bulletins/rss/2026-030-aws/

https://aws.amazon.com/security/security-bulletins/rss/2026-029-aws/

https://www.infosecurity-magazine.com/news/dirty-frag-linux-kernel/

https://www.databreachtoday.com/dirty-frag-gives-root-on-linux-distros-a-31641

https://kb.cert.org/vuls/id/260001

https://isc.sans.edu/diary/rss/32968

https://aws.amazon.com/security/security-bulletins/rss/2026-027-aws/

https://aws.amazon.com/security/security-bulletins/rss/2026-026-aws/

https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/

https://docs.cloud.google.com/support/bulletins/index#gcp-2026-028

https://www.infosecurity-magazine.com/news/zero-day-2017-linux-kernel/

https://docs.cloud.google.com/support/bulletins/index#gcp-2026-026

https://www.securityweek.com/copy-fail-logic-flaw-in-linux-kernel-enables-system-takeover/

https://www.darkreading.com/vulnerabilities-threats/ai-assisted-software-scan-linux-bug

https://www.bleepingcomputer.com/news/security/new-linux-copy-fail-flaw-gives-hackers-root-on-major-distros/

https://webflow.sysdig.com/blog/cve-2026-31431-copy-fail-linux-kernel-flaw-lets-local-users-gain-root-in-seconds

https://thehackernews.com/2026/04/new-linux-copy-fail-vulnerability.html

https://hackread.com/linux-kernel-vulnerability-copy-fail-full-root-access/

https://arstechnica.com/security/2026/04/as-the-most-severe-linux-threat-in-years-surfaces-the-world-scrambles/

https://www.theregister.com/2026/04/30/linux_cryptographic_code_flaw/

https://www.tenable.com/blog/fragnesia-cve-2026-46300-faq-about-new-linux-kernel-xfrm-esp-in-tcp-priv-esc

https://www.tenable.com/blog/dirty-frag-cve-2026-43284-cve-2026-43500-frequently-asked-questions-linux-kernel-lpe

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

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

https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8

https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237

https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5

https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b

https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82

https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667

https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc

https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Details

Source: Mitre, NVD

Published: 2026-04-22

Updated: 2026-05-12

Named Vulnerability: copy.failNamed Vulnerability: CopyFailNamed Vulnerability: Copy FailKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

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

Severity: High

CVSS v4

Base Score: 8.6

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00007

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest