CVE-2024-26923 (GCVE-0-2024-26923)
Vulnerability from cvelistv5
Published
2024-04-24 21:49
Modified
2025-05-04 08:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: af_unix: Fix garbage collector racing against connect() Garbage collector does not take into account the risk of embryo getting enqueued during the garbage collection. If such embryo has a peer that carries SCM_RIGHTS, two consecutive passes of scan_children() may see a different set of children. Leading to an incorrectly elevated inflight count, and then a dangling pointer within the gc_inflight_list. sockets are AF_UNIX/SOCK_STREAM S is an unconnected socket L is a listening in-flight socket bound to addr, not in fdtable V's fd will be passed via sendmsg(), gets inflight count bumped connect(S, addr) sendmsg(S, [V]); close(V) __unix_gc() ---------------- ------------------------- ----------- NS = unix_create1() skb1 = sock_wmalloc(NS) L = unix_find_other(addr) unix_state_lock(L) unix_peer(S) = NS // V count=1 inflight=0 NS = unix_peer(S) skb2 = sock_alloc() skb_queue_tail(NS, skb2[V]) // V became in-flight // V count=2 inflight=1 close(V) // V count=1 inflight=1 // GC candidate condition met for u in gc_inflight_list: if (total_refs == inflight_refs) add u to gc_candidates // gc_candidates={L, V} for u in gc_candidates: scan_children(u, dec_inflight) // embryo (skb1) was not // reachable from L yet, so V's // inflight remains unchanged __skb_queue_tail(L, skb1) unix_state_unlock(L) for u in gc_candidates: if (u.inflight) scan_children(u, inc_inflight_move_tail) // V count=1 inflight=2 (!) If there is a GC-candidate listening socket, lock/unlock its state. This makes GC wait until the end of any ongoing connect() to that socket. After flipping the lock, a possibly SCM-laden embryo is already enqueued. And if there is another embryo coming, it can not possibly carry SCM_RIGHTS. At this point, unix_inflight() can not happen because unix_gc_lock is already taken. Inflight graph remains unaffected.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
Version: 1fd05ba5a2f2aa8e7b9b52ef55df850e2e7d54c9
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          "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\u0027s 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\u0027s\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."
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\"2.6.23\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.314\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.275\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.156\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.87\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.28\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/unix/garbage.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\u0027s 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\u0027s\\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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.314\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.275\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.216\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.156\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.87\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.28\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.7\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"2.6.23\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:59:47.874Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26923\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:59:47.874Z\", \"dateReserved\": \"2024-02-19T14:20:24.194Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-24T21:49:22.001Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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