{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26923","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.194Z","datePublished":"2024-04-24T21:49:22.001Z","dateUpdated":"2026-05-12T11:50:40.454Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T20:06:59.719Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix garbage collector racing against connect()\n\nGarbage collector does not take into account the risk of embryo getting\nenqueued during the garbage collection. If such embryo has a peer that\ncarries SCM_RIGHTS, two consecutive passes of scan_children() may see a\ndifferent set of children. Leading to an incorrectly elevated inflight\ncount, and then a dangling pointer within the gc_inflight_list.\n\nsockets are AF_UNIX/SOCK_STREAM\nS is an unconnected socket\nL is a listening in-flight socket bound to addr, not in fdtable\nV's fd will be passed via sendmsg(), gets inflight count bumped\n\nconnect(S, addr)\tsendmsg(S, [V]); close(V)\t__unix_gc()\n----------------\t-------------------------\t-----------\n\nNS = unix_create1()\nskb1 = sock_wmalloc(NS)\nL = unix_find_other(addr)\nunix_state_lock(L)\nunix_peer(S) = NS\n\t\t\t// V count=1 inflight=0\n\n \t\t\tNS = unix_peer(S)\n \t\t\tskb2 = sock_alloc()\n\t\t\tskb_queue_tail(NS, skb2[V])\n\n\t\t\t// V became in-flight\n\t\t\t// V count=2 inflight=1\n\n\t\t\tclose(V)\n\n\t\t\t// V count=1 inflight=1\n\t\t\t// GC candidate condition met\n\n\t\t\t\t\t\tfor u in gc_inflight_list:\n\t\t\t\t\t\t  if (total_refs == inflight_refs)\n\t\t\t\t\t\t    add u to gc_candidates\n\n\t\t\t\t\t\t// gc_candidates={L, V}\n\n\t\t\t\t\t\tfor u in gc_candidates:\n\t\t\t\t\t\t  scan_children(u, dec_inflight)\n\n\t\t\t\t\t\t// embryo (skb1) was not\n\t\t\t\t\t\t// reachable from L yet, so V's\n\t\t\t\t\t\t// inflight remains unchanged\n__skb_queue_tail(L, skb1)\nunix_state_unlock(L)\n\t\t\t\t\t\tfor u in gc_candidates:\n\t\t\t\t\t\t  if (u.inflight)\n\t\t\t\t\t\t    scan_children(u, inc_inflight_move_tail)\n\n\t\t\t\t\t\t// V count=1 inflight=2 (!)\n\nIf there is a GC-candidate listening socket, lock/unlock its state. This\nmakes GC wait until the end of any ongoing connect() to that socket. After\nflipping the lock, a possibly SCM-laden embryo is already enqueued. And if\nthere is another embryo coming, it can not possibly carry SCM_RIGHTS. At\nthis point, unix_inflight() can not happen because unix_gc_lock is already\ntaken. Inflight graph remains unaffected."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/unix/garbage.c"],"versions":[{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"a36ae0ec2353015f0f6762e59f4c2dbc0c906423","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"343c5372d5e17b306db5f8f3c895539b06e3177f","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"2e2a03787f4f0abc0072350654ab0ef3324d9db3","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"e76c2678228f6aec74b305ae30c9374cc2f28a51","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"b75722be422c276b699200de90527d01c602ea7c","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"507cc232ffe53a352847893f8177d276c3b532a9","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"dbdf7bec5c920200077d693193f989cb1513f009","status":"affected","versionType":"git"},{"version":"1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9","lessThan":"47d8ac011fe1c9251070e1bd64cb10b48193ec51","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/unix/garbage.c"],"versions":[{"version":"2.6.23","status":"affected"},{"version":"0","lessThan":"2.6.23","status":"unaffected","versionType":"semver"},{"version":"4.19.314","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.275","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.216","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.156","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.87","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.28","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.7","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"4.19.314"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.4.275"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.10.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.15.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.1.87"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.6.28"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.8.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a36ae0ec2353015f0f6762e59f4c2dbc0c906423"},{"url":"https://git.kernel.org/stable/c/343c5372d5e17b306db5f8f3c895539b06e3177f"},{"url":"https://git.kernel.org/stable/c/2e2a03787f4f0abc0072350654ab0ef3324d9db3"},{"url":"https://git.kernel.org/stable/c/e76c2678228f6aec74b305ae30c9374cc2f28a51"},{"url":"https://git.kernel.org/stable/c/b75722be422c276b699200de90527d01c602ea7c"},{"url":"https://git.kernel.org/stable/c/507cc232ffe53a352847893f8177d276c3b532a9"},{"url":"https://git.kernel.org/stable/c/dbdf7bec5c920200077d693193f989cb1513f009"},{"url":"https://git.kernel.org/stable/c/47d8ac011fe1c9251070e1bd64cb10b48193ec51"}],"title":"af_unix: 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