{"id":"CVE-2026-31431","published":"2026-04-22T09:16:21Z","modified":"2026-09-08T15:13:07Z","title":"Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability","vendor":"Linux","product":"Kernel","tier":"core","eol":null,"description":{"text":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings.  Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly.","provenance":"source","from":"NVD"},"summary":{"text":"The Linux kernel's crypto subsystem, specifically the algif_aead component that exposes AEAD (authenticated encryption with associated data) operations to userspace via the AF_ALG socket interface, contains an incorrect resource transfer between spheres flaw, along with an improper validation of input consistency weakness. An attacker with local access and low-privileged authentication, requiring no user interaction, could exploit this flaw to affect confidentiality, integrity and availability of the system.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:39Z"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.98114,"percentile":0.99912,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-05-01","dueDate":"2026-05-15","ransomware":false,"requiredAction":"\"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/; https://xint.io/blog/copy-fail-linux-distributions#the-fix-6 ; https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/about/ ; https://nvd.nist.gov/vuln/detail/CVE-2026-31431","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-05-01","exploitedFirstSeen":"2026-05-01","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-05-01"},{"url":"https://www.microsoft.com/en-us/security/blog/2026/05/01/cve-2026-31431-copy-fail-vulnerability-enables-linux-root-privilege-escalation/","date":"2026-05-01"},{"url":"https://www.microsoft.com/en-us/security/blog/2026/05/08/active-attack-dirty-frag-linux-vulnerability-expands-post-compromise-risk/","date":"2026-05-08"},{"url":"https://www.reversinglabs.com/blog/dirtyfrag-linux-privilege-escalation-exploit","date":"2026-05-12"},{"url":"https://www.proofpoint.com/us/blog/threat-insight/more-cves-same-playbook-2026-vulnerability-exploitation-wild","date":"2026-05-27"},{"url":"https://securitybridge.com/press/saps-bloodhound-moment-sapmap-maps-attack-paths-across-an-entire-landscape/","date":"2026-07-15"},{"url":"https://go.crowdstrike.com/rs/281-OBQ-266/images/CrowdStrike-2026-Threat-Hunting-Report.pdf","date":"2026-08-03"},{"url":"https://www.crowdstrike.com/en-us/blog/crowdstrike-2026-threat-hunting-report/","date":"2026-08-03"},{"url":"https://securelist.com/vulnerabilities-and-exploits-in-q2-2026/121091/","date":"2026-08-26"},{"url":"https://www.f5.com/labs/articles/weekly-threat-bulletin-september-2nd-2026","date":"2026-09-01"}],"evidenceTotal":11,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev 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expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-24639","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24639","exploited":true,"exploitedSince":"2026-05-01","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":282,"skipped":44,"earliest":"2026-03-08","earliestUrl":"https://github.com/John-Popovici/CVE-2026-31431-CopyFail-Linux-PrivEsc","repos":[{"name":"theori-io/copy-fail-CVE-2026-31431","url":"https://github.com/theori-io/copy-fail-CVE-2026-31431","stars":4083,"created":"2026-04-29"},{"name":"tgies/copy-fail-c","url":"https://github.com/tgies/copy-fail-c","stars":448,"created":"2026-04-29"},{"name":"badsectorlabs/copyfail-go","url":"https://github.com/badsectorlabs/copyfail-go","stars":360,"created":"2026-04-29"},{"name":"Percivalll/Copy-Fail-CVE-2026-31431-Kubernetes-PoC","url":"https://github.com/Percivalll/Copy-Fail-CVE-2026-31431-Kubernetes-PoC","stars":194,"created":"2026-04-30"},{"name":"Sndav/CVE-2026-31431-Advanced-Exploit","url":"https://github.com/Sndav/CVE-2026-31431-Advanced-Exploit","stars":115,"created":"2026-04-30"}]},"metasploit":[{"name":"Copy 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catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 183 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.98,"detail":"percentile 0.9991"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"8 NVD references tagged Exploit; 282 PoC-in-GitHub repos; 1 Metasploit module"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.46,"detail":"base score 7.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}