vsock: Fix memory leak in vmci_transport_recv_dgram_cb()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98947
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:15 UTC
Updated2026-10-23 13:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vsock: Fix memory leak in vmci_transport_recv_dgram_cb() During the closure of a datagram socket, the vmci_transport_recv_dgram_cb() function may be called, which will add the packets to the socket's backlog; then, after the receive queue is cleared, the __release_sock() function will move the packet back from the socket's backlog to the receive queue, which will lead to a memory leak. sock_close __sock_release __vsock_release // take ownership by user-space lock_sock_nested sock_set_flag(sk, SOCK_DEAD) vmci_transport_release vmci_dispatch_dgs vmci_datagram_invoke_guest_handler vmci_transport_recv_dgram_cb sk_receive_skb if (!sock_owned_by_user(sk)) [...] (!) else if sk_add_backlog() [...] (!) skb_queue_purge(&sk->sk_receive_queue) release_sock __release_sock // move all packets from the backlog // to the receive queue (!) sk_backlog_rcv vsock_queue_rcv_skb [...] __sock_queue_rcv_skb if (!sock_flag(sk, SOCK_DEAD)) // Since the socket is "dead", the function will not // be called sk->sk_data_ready(sk) sock_release_ownership(sk); sock_put Add a receive queue cleanup in the socket destructor to fix this. syzkaller report: unreferenced object 0xffff8880117bfb80 (size 240): comm "irq/56-vmw_vmci", pid 205, jiffies 4295064448 (age 73.992s) hex dump (first 32 bytes): 78 dc 26 1e 80 88 ff ff 78 dc 26 1e 80 88 ff ff x.&.....x.&..... 00 00 00 00 00 00 00 00 c0 da 26 1e 80 88 ff ff ..........&..... backtrace: [<ffffffff82be8d97>] __alloc_skb+0x287/0x330 net/core/skbuff.c:505 [<ffffffffa114bcbd>] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport] [<ffffffffa05072c6>] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci] [<ffffffffa050ad75>] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci] [<ffffffffa050b025>] vmci_interrupt+0x55/0x290 [vmw_vmci] [<ffffffff8137ad2b>] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205 [<ffffffff8137c7ae>] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314 [<ffffffff81253dd6>] kthread+0x2e6/0x3a0 kernel/kthread.c:376 [<ffffffff81004392>] ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295 Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d021c344051af91f42c5ba9fdedc176740cbd238 0f8e2b2045355a0ee2008125e573435504b13cee git Not specified
CNA Linux Linux affected d021c344051af91f42c5ba9fdedc176740cbd238 4835dbcde5cc3ae37e0d0796052056b35fcae8bf git Not specified
CNA Linux Linux affected d021c344051af91f42c5ba9fdedc176740cbd238 9907db2b8e7ba70b442bb9dec86526a6511fac62 git Not specified
CNA Linux Linux affected d021c344051af91f42c5ba9fdedc176740cbd238 7c24a4e87e219072e5e106f6791146cbf3b056b3 git Not specified
CNA Linux Linux affected 3.9 Not specified
CNA Linux Linux unaffected 3.9 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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