{"api_version":"1","generated_at":"2026-08-23T21:53:22+00:00","cve":"CVE-2026-74631","urls":{"html":"https://cve.report/CVE-2026-74631","api":"https://cve.report/api/cve/CVE-2026-74631.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74631","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74631"},"summary":{"title":"net: smc: fix splice entry lifetime imbalance in smc_rx_splice","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: smc: fix splice entry lifetime imbalance in smc_rx_splice\n\nsmc_rx_splice() passes pages to splice_to_pipe() before taking the\nreferences that cover the lifetime of each splice entry. In the\nVM-backed RMB path, splice_to_pipe() may drop unqueued entries through\nsmc_rx_spd_release(), while queued entries are released later via the\npipe buffer callback.\n\nThe old post-splice accounting also derives the number of queued VM pages\nfrom an offset mutated while building the descriptor, and a multi-page\nsplice pairs one sock_hold() with multiple sock_put() calls.\n\nTake the page and socket references for every candidate entry before\nsplice_to_pipe(), and drop the matching private state, page reference,\nand socket reference from smc_rx_spd_release() for entries that never\nget queued. This fixes a refcount imbalance that can underflow page\nrefcounts and trigger a use-after-free.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:36","updated_at":"2026-08-23 13:16:47"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0","name":"https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8","name":"https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b","name":"https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d","name":"https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb","name":"https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e","name":"https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090","name":"https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5","name":"https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74631","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74631","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f 07ad246529d136d5ef441d5ab4c305d132ff3090 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f c841789e456ec6751342fa800639ce8e82ff0e6b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f af02c67ce654356c58db20a0bb2db33ace3b07a8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.217 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/smc/smc_rx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"07ad246529d136d5ef441d5ab4c305d132ff3090","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"c841789e456ec6751342fa800639ce8e82ff0e6b","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"af02c67ce654356c58db20a0bb2db33ace3b07a8","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"ca8342b5fc24c249fdb998468f6a168b457c67e5","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"4515c78f4d9fd577270f012efeb062ea58b3682d","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"},{"lessThan":"5d9686af2976741bbd79b150d1c9e60b81e7f12e","status":"affected","version":"9014db202cb764b8e14c53e7bacc81f9a1a2ba7f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/smc/smc_rx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.18"},{"lessThan":"4.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.266","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.217","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.266","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.217","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: smc: fix splice entry lifetime imbalance in smc_rx_splice\n\nsmc_rx_splice() passes pages to splice_to_pipe() before taking the\nreferences that cover the lifetime of each splice entry. In the\nVM-backed RMB path, splice_to_pipe() may drop unqueued entries through\nsmc_rx_spd_release(), while queued entries are released later via the\npipe buffer callback.\n\nThe old post-splice accounting also derives the number of queued VM pages\nfrom an offset mutated while building the descriptor, and a multi-page\nsplice pairs one sock_hold() with multiple sock_put() calls.\n\nTake the page and socket references for every candidate entry before\nsplice_to_pipe(), and drop the matching private state, page reference,\nand socket reference from smc_rx_spd_release() for entries that never\nget queued. This fixes a refcount imbalance that can underflow page\nrefcounts and trigger a use-after-free."}],"providerMetadata":{"dateUpdated":"2026-08-23T12:47:52.943Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb"},{"url":"https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090"},{"url":"https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b"},{"url":"https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8"},{"url":"https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5"},{"url":"https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0"},{"url":"https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d"},{"url":"https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e"}],"title":"net: smc: fix splice entry lifetime imbalance in smc_rx_splice","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74631","datePublished":"2026-08-22T15:32:12.334Z","dateReserved":"2026-08-15T05:44:03.922Z","dateUpdated":"2026-08-23T12:47:52.943Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:36","lastModifiedDate":"2026-08-23 13:16:47","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74631","Ordinal":"1","Title":"net: smc: fix splice entry lifetime imbalance in smc_rx_splice","CVE":"CVE-2026-74631","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74631","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: smc: fix splice entry lifetime imbalance in smc_rx_splice\n\nsmc_rx_splice() passes pages to splice_to_pipe() before taking the\nreferences that cover the lifetime of each splice entry. In the\nVM-backed RMB path, splice_to_pipe() may drop unqueued entries through\nsmc_rx_spd_release(), while queued entries are released later via the\npipe buffer callback.\n\nThe old post-splice accounting also derives the number of queued VM pages\nfrom an offset mutated while building the descriptor, and a multi-page\nsplice pairs one sock_hold() with multiple sock_put() calls.\n\nTake the page and socket references for every candidate entry before\nsplice_to_pipe(), and drop the matching private state, page reference,\nand socket reference from smc_rx_spd_release() for entries that never\nget queued. This fixes a refcount imbalance that can underflow page\nrefcounts and trigger a use-after-free.","Type":"Description","Title":"net: smc: fix splice entry lifetime imbalance in smc_rx_splice"}]}}}