CVE-2026-31431 (GCVE-0-2026-31431)
Vulnerability from cvelistv5
Published
2026-04-22 08:15
Modified
2026-08-21 12:13
Summary
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.
Impacted products
Vendor Product Version
Linux Linux Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
Version: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7
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CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2026-05-01

Due date: 2026-05-15

Required action: "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Used in ransomware: Unknown

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

Show details on NVD website


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This is a standard local kernel attack surface.\\nC:H - The removed in-place AEAD design used user-writable RX scatterlists as crypto source data and chained TX tag pages, creating a plausible decryption/authentication bypass for data protected by secret AEAD keys. Under the required uncertainty rule, this is scored as high confidentiality impact.\\nI:H - The bug undermines AEAD authenticity by allowing source data used by the crypto operation to diverge from the data originally submitted and authenticated. This can allow forged or corrupted plaintext/ciphertext results, so integrity impact is high.\\nA:H - The vulnerable path builds complex chained scatterlists from attacker-controlled local buffers and related AF_ALG fixes show these paths can lead to scatterwalk NULL dereferences and kernel panics. A local attacker can repeatedly trigger the operation, so availability impact is high.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"893d22e0135fa394db81df88697fba6032747667\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"19d43105a97be0810edbda875f2cd03f30dc130c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"961cfa271a918ad4ae452420e7c303149002875b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"3115af9644c342b356f3f07a4dd1c8905cd9a6fc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"8b88d99341f139e23bdeb1027a2a3ae10d341d82\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"ce42ee423e58dffa5ec03524054c9d8bfd4f6237\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"72548b093ee38a6d4f2a19e6ef1948ae05c181f7\", \"lessThan\": \"a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5\", \"versionType\": \"git\"}], \"programFiles\": [\"crypto/af_alg.c\", \"crypto/algif_aead.c\", \"crypto/algif_skcipher.c\", \"include/crypto/if_alg.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.254\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.204\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.170\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.137\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"crypto/af_alg.c\", \"crypto/algif_aead.c\", \"crypto/algif_skcipher.c\", \"include/crypto/if_alg.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667\"}, {\"url\": \"https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c\"}, {\"url\": \"https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b\"}, {\"url\": \"https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc\"}, {\"url\": \"https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82\"}, {\"url\": \"https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8\"}, {\"url\": \"https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237\"}, {\"url\": \"https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.254\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.204\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.170\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.137\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.85\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.22\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.12\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"4.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:22:25.522Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31431\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-21T12:13:01.205Z\", \"dateReserved\": \"2026-03-09T15:48:24.089Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-22T08:15:10.123Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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