Orta CVSS 4.7

CVE-2024-26923: Linux Kernel: yarış durumu

Yayın: 25 Nisan 2024 09:15 · Güncelleme: 6 Kasım 2026 09:47

Açıklama (NVD)

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.

Özet bilgiler

Ürün: Linux Linux Kernel
CVSS v3.1: 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: %0,21 (yüzdelik 11)
CWE: CWE-362
Yama: Mevcut

Etkilenen sürümler

Ürün	Başlangıç	Bitiş	Düzeltildi
linux-linux-kernel	2.6.23	—	4.19.314
linux-linux-kernel	4.20	—	5.4.275
linux-linux-kernel	5.5	—	5.10.216
linux-linux-kernel	5.11	—	5.15.156
linux-linux-kernel	5.16	—	6.1.87
linux-linux-kernel	6.2	—	6.6.28
linux-linux-kernel	6.7	—	6.8.7
linux-linux-kernel	6.9	6.9	—
linux-linux-kernel	6.9	6.9	—
linux-linux-kernel	6.9	6.9	—
debian-debian-linux	10.0	10.0	—

Kaynaklar

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