{"api_version":"1","generated_at":"2026-08-17T01:13:37+00:00","cve":"CVE-2026-74262","urls":{"html":"https://cve.report/CVE-2026-74262","api":"https://cve.report/api/cve/CVE-2026-74262.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74262","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74262"},"summary":{"title":"kcm: use WRITE_ONCE() when changing lower socket callbacks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: use WRITE_ONCE() when changing lower socket callbacks\n\nkcm_attach() replaces a live lower TCP socket's sk_data_ready and\nsk_write_space callbacks with KCM handlers, and kcm_unattach() restores\nthem later. Those callback-pointer updates are still plain stores even\nthough the same fields can be read and invoked concurrently on other\nCPUs.\n\nIf another CPU observes an older callback snapshot after the live field\nhas already been restored, callback execution can run with a mismatched\ntarget and sk_user_data state, leading to stale or misdirected wakeups.\n\nUse WRITE_ONCE() for the callback replacement and restore operations so\nthese shared callback fields follow the same visibility contract already\nestablished by the earlier 4022 fixes.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:25","updated_at":"2026-08-15 06:22:25"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b4ccd6eef671d7c44a30123cd29f3acf3de8468e","name":"https://git.kernel.org/stable/c/b4ccd6eef671d7c44a30123cd29f3acf3de8468e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/11faefd11ce2448bac7279ab302dd1954a6547fe","name":"https://git.kernel.org/stable/c/11faefd11ce2448bac7279ab302dd1954a6547fe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0cb3e2f40679032c1aa2186280a86e5ead0161ee","name":"https://git.kernel.org/stable/c/0cb3e2f40679032c1aa2186280a86e5ead0161ee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fa26e4606aed0f7fe793c325506adeda1d847a43","name":"https://git.kernel.org/stable/c/fa26e4606aed0f7fe793c325506adeda1d847a43","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b8c90823cdfb5f3d22f261aeb3e9066612853c36","name":"https://git.kernel.org/stable/c/b8c90823cdfb5f3d22f261aeb3e9066612853c36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47186409c092cd7dd70350999186c700233e854d","name":"https://git.kernel.org/stable/c/47186409c092cd7dd70350999186c700233e854d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f01fb6138f8eb606b56ce9158e2d8b72352c53f4","name":"https://git.kernel.org/stable/c/f01fb6138f8eb606b56ce9158e2d8b72352c53f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9684fff87124b201e11dea01ded9173025359a0f","name":"https://git.kernel.org/stable/c/9684fff87124b201e11dea01ded9173025359a0f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74262","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74262","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 0cb3e2f40679032c1aa2186280a86e5ead0161ee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 fa26e4606aed0f7fe793c325506adeda1d847a43 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 b4ccd6eef671d7c44a30123cd29f3acf3de8468e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 b8c90823cdfb5f3d22f261aeb3e9066612853c36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74262","cve":"CVE-2026-74262","epss":"0.001900000","percentile":"0.089720000","score_date":"2026-08-16","updated_at":"2026-08-17 00:01:05"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/kcm/kcmsock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0cb3e2f40679032c1aa2186280a86e5ead0161ee","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"fa26e4606aed0f7fe793c325506adeda1d847a43","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"b4ccd6eef671d7c44a30123cd29f3acf3de8468e","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"b8c90823cdfb5f3d22f261aeb3e9066612853c36","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"11faefd11ce2448bac7279ab302dd1954a6547fe","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"f01fb6138f8eb606b56ce9158e2d8b72352c53f4","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"9684fff87124b201e11dea01ded9173025359a0f","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"},{"lessThan":"47186409c092cd7dd70350999186c700233e854d","status":"affected","version":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/kcm/kcmsock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.6"},{"lessThan":"4.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"4.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: use WRITE_ONCE() when changing lower socket callbacks\n\nkcm_attach() replaces a live lower TCP socket's sk_data_ready and\nsk_write_space callbacks with KCM handlers, and kcm_unattach() restores\nthem later. Those callback-pointer updates are still plain stores even\nthough the same fields can be read and invoked concurrently on other\nCPUs.\n\nIf another CPU observes an older callback snapshot after the live field\nhas already been restored, callback execution can run with a mismatched\ntarget and sk_user_data state, leading to stale or misdirected wakeups.\n\nUse WRITE_ONCE() for the callback replacement and restore operations so\nthese shared callback fields follow the same visibility contract already\nestablished by the earlier 4022 fixes."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:57:38.990Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0cb3e2f40679032c1aa2186280a86e5ead0161ee"},{"url":"https://git.kernel.org/stable/c/fa26e4606aed0f7fe793c325506adeda1d847a43"},{"url":"https://git.kernel.org/stable/c/b4ccd6eef671d7c44a30123cd29f3acf3de8468e"},{"url":"https://git.kernel.org/stable/c/b8c90823cdfb5f3d22f261aeb3e9066612853c36"},{"url":"https://git.kernel.org/stable/c/11faefd11ce2448bac7279ab302dd1954a6547fe"},{"url":"https://git.kernel.org/stable/c/f01fb6138f8eb606b56ce9158e2d8b72352c53f4"},{"url":"https://git.kernel.org/stable/c/9684fff87124b201e11dea01ded9173025359a0f"},{"url":"https://git.kernel.org/stable/c/47186409c092cd7dd70350999186c700233e854d"}],"title":"kcm: use WRITE_ONCE() when changing lower socket callbacks","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74262","datePublished":"2026-08-15T05:57:38.990Z","dateReserved":"2026-08-15T05:44:03.877Z","dateUpdated":"2026-08-15T05:57:38.990Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:25","lastModifiedDate":"2026-08-15 06:22:25","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74262","Ordinal":"1","Title":"kcm: use WRITE_ONCE() when changing lower socket callbacks","CVE":"CVE-2026-74262","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74262","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: use WRITE_ONCE() when changing lower socket callbacks\n\nkcm_attach() replaces a live lower TCP socket's sk_data_ready and\nsk_write_space callbacks with KCM handlers, and kcm_unattach() restores\nthem later. Those callback-pointer updates are still plain stores even\nthough the same fields can be read and invoked concurrently on other\nCPUs.\n\nIf another CPU observes an older callback snapshot after the live field\nhas already been restored, callback execution can run with a mismatched\ntarget and sk_user_data state, leading to stale or misdirected wakeups.\n\nUse WRITE_ONCE() for the callback replacement and restore operations so\nthese shared callback fields follow the same visibility contract already\nestablished by the earlier 4022 fixes.","Type":"Description","Title":"kcm: use WRITE_ONCE() when changing lower socket callbacks"}]}}}