Linux Kernel
CVE-2024-26614
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition requires precise concurrent timing between softirq packet processing and socket shutdown, elevating AC to H versus the NVD-assigned AC:L; all other metrics retain NVD values.
Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).
CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Lifecycle Timeline
7DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
tcp: make sure init the accept_queue's spinlocks once
When I run syz's reproduction C program locally, it causes the following issue: pvqspinlock: lock 0xffff9d181cd5c660 has corrupted value 0x0! WARNING: CPU: 19 PID: 21160 at __pv_queued_spin_unlock_slowpath (kernel/locking/qspinlock_paravirt.h:508) Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 RIP: 0010:__pv_queued_spin_unlock_slowpath (kernel/locking/qspinlock_paravirt.h:508) Code: 73 56 3a ff 90 c3 cc cc cc cc 8b 05 bb 1f 48 01 85 c0 74 05 c3 cc cc cc cc 8b 17 48 89 fe 48 c7 c7 30 20 ce 8f e8 ad 56 42 ff <0f> 0b c3 cc cc cc cc 0f 0b 0f 1f 40 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffa8d200604cb8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff9d1ef60e0908 RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff9d1ef60e0900 RBP: ffff9d181cd5c280 R08: 0000000000000000 R09: 00000000ffff7fff R10: ffffa8d200604b68 R11: ffffffff907dcdc8 R12: 0000000000000000 R13: ffff9d181cd5c660 R14: ffff9d1813a3f330 R15: 0000000000001000 FS: 00007fa110184640(0000) GS:ffff9d1ef60c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000011f65e000 CR4: 00000000000006f0 Call Trace: <IRQ> _raw_spin_unlock (kernel/locking/spinlock.c:186) inet_csk_reqsk_queue_add (net/ipv4/inet_connection_sock.c:1321) inet_csk_complete_hashdance (net/ipv4/inet_connection_sock.c:1358) tcp_check_req (net/ipv4/tcp_minisocks.c:868) tcp_v4_rcv (net/ipv4/tcp_ipv4.c:2260) ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205) ip_local_deliver_finish (net/ipv4/ip_input.c:234) __netif_receive_skb_one_core (net/core/dev.c:5529) process_backlog (./include/linux/rcupdate.h:779) __napi_poll (net/core/dev.c:6533) net_rx_action (net/core/dev.c:6604) __do_softirq (./arch/x86/include/asm/jump_label.h:27) do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) </IRQ> <TASK> __local_bh_enable_ip (kernel/softirq.c:381) __dev_queue_xmit (net/core/dev.c:4374) ip_finish_output2 (./include/net/neighbour.h:540 net/ipv4/ip_output.c:235) __ip_queue_xmit (net/ipv4/ip_output.c:535) __tcp_transmit_skb (net/ipv4/tcp_output.c:1462) tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6469) tcp_rcv_state_process (net/ipv4/tcp_input.c:6657) tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1929) __release_sock (./include/net/sock.h:1121 net/core/sock.c:2968) release_sock (net/core/sock.c:3536) inet_wait_for_connect (net/ipv4/af_inet.c:609) __inet_stream_connect (net/ipv4/af_inet.c:702) inet_stream_connect (net/ipv4/af_inet.c:748) __sys_connect (./include/linux/file.h:45 net/socket.c:2064) __x64_sys_connect (net/socket.c:2073 net/socket.c:2070 net/socket.c:2070) do_syscall_64 (arch/x86/entry/common.c:51 arch/x86/entry/common.c:82) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) RIP: 0033:0x7fa10ff05a3d Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ab a3 0e 00 f7 d8 64 89 01 48 RSP: 002b:00007fa110183de8 EFLAGS: 00000202 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000020000054 RCX: 00007fa10ff05a3d RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007fa110183e20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fa110184640 R13: 0000000000000000 R14: 00007fa10fe8b060 R15: 00007fff73e23b20 </TASK>
The issue triggering process is analyzed as follows: Thread A Thread B tcp_v4_rcv //receive ack TCP packet inet_shutdown tcp_check_req tcp_disconnect //disconnect sock ... tcp_set_state(sk, TCP_CLOSE) inet_csk_complete_hashdance ... inet_csk_reqsk_queue_add ---truncated---
AnalysisAI
Spinlock corruption in the Linux kernel TCP accept_queue allows a local low-privileged attacker to trigger a race condition between concurrent TCP connection processing and socket shutdown, producing a kernel WARNING from the paravirtualized spinlock subsystem and potentially escalating to kernel memory corruption or privilege escalation. The flaw arises because accept_queue spinlocks are not guaranteed to be initialized exactly once before use, leaving them in a zero-corrupted state when TCP packet reception races against socket disconnection. Despite a CVSS score of 7.8, the EPSS of 0.17% (7th percentile) reflects negligible real-world exploitation interest, and no public exploit or CISA KEV listing exists at time of analysis.
Technical ContextAI
The vulnerability resides in the Linux kernel TCP stack, specifically in inet_csk_reqsk_queue_add() at net/ipv4/inet_connection_sock.c:1321 and the surrounding three-way handshake completion logic in inet_csk_complete_hashdance(). The accept_queue structure uses a spinlock to synchronize concurrent access between the softirq path completing a TCP handshake and userspace threads reading completed connections. CWE-667 (Improper Locking) identifies the root cause: the accept_queue spinlocks are not initialized atomically and exactly once before concurrent use, allowing a racing tcp_disconnect() call (via inet_shutdown) to leave the spinlock in a corrupted zeroed state. The paravirtualized spinlock implementation (pvqspinlock, used in KVM and similar hypervisor environments) actively detects this corruption and emits a kernel WARNING at qspinlock_paravirt.h:508. CPE data confirms the affected product as cpe:2.3:o:linux:linux_kernel across multiple version ranges including the 6.8:rc1 release candidate, with Debian Linux 10.0 listed as an affected downstream distribution.
RemediationAI
Apply the upstream Linux kernel stable-tree patches, which are available across multiple branches: https://git.kernel.org/stable/c/168e7e599860654876c2a1102a82610285c02f02, https://git.kernel.org/stable/c/198bc90e0e734e5f98c3d2833e8390cac3df61b2, https://git.kernel.org/stable/c/3982fe726a63fb3de6005e534e2ac8ca7e0aca2a, https://git.kernel.org/stable/c/b1e0a68a0cd2a83259c444f638b417a8fffc6855, https://git.kernel.org/stable/c/bc99dcedd2f422d602516762b96c8ef1ae6b2882, and https://git.kernel.org/stable/c/d86cc6ab33b085eaef27ea88b78fc8e2375c0ef3. Specific patched distribution package versions must be confirmed via distribution advisories - the exact fixed kernel release per branch is not independently verifiable from available NVD data alone. Debian LTS users should apply the update announced at https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html. Red Hat customers should consult their advisory channel for RHEL kernel updates incorporating this fix. As a compensating control, restricting local shell access on TCP server systems reduces the window for triggering the race; however, this does not eliminate the vulnerability and is not a substitute for patching.
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External POC / Exploit Code
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