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CVE-2026-53034— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.15版本存在安全漏洞，该漏洞源于bpf和sockmap在unix_stream_connect中设置sk_state后未正确检查peer，导致空指针取消引用，可能导致系统崩溃。以下版本受到影响：5.15版本。

AI 预测 7.8 利用难度: 中等 EPSS 0.13% · P2

影响版本矩阵 14

厂商产品 版本范围状态
Linux Linux c63829182c37c2d6d0608976d15fa61ebebe9e6b< 75b7d3b3f8bd4e59eb3af1b11a43c64c0c2db6f4 affected
c63829182c37c2d6d0608976d15fa61ebebe9e6b< a94d3dd78ee8b63e6b8ad629081c952c93ee5a10 affected
c63829182c37c2d6d0608976d15fa61ebebe9e6b< 4913c94a3adcdbb64c552110c0c243cb1fdbb317 affected
c63829182c37c2d6d0608976d15fa61ebebe9e6b< 041eb6348d73ee5e15fc8161f1eac5a6e8289ca0 affected
c63829182c37c2d6d0608976d15fa61ebebe9e6b< 37bfcd164161b47d00b1c3bd20adc816a6977ce0 affected
c63829182c37c2d6d0608976d15fa61ebebe9e6b< dca38b7734d2ea00af4818ff3ae836fab33d5d5a affected
5.15 affected
< 5.15 unaffected
… +6 条更多
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一、 漏洞 CVE-2026-53034 基础信息

漏洞信息
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Vulnerability Title
bpf, sockmap: Fix af_unix null-ptr-deref in proto update
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix af_unix null-ptr-deref in proto update unix_stream_connect() sets sk_state (`WRITE_ONCE(sk->sk_state, TCP_ESTABLISHED)`) _before_ it assigns a peer (`unix_peer(sk) = newsk`). sk_state == TCP_ESTABLISHED makes sock_map_sk_state_allowed() believe that socket is properly set up, which would include having a defined peer. IOW, there's a window when unix_stream_bpf_update_proto() can be called on socket which still has unix_peer(sk) == NULL. CPU0 bpf CPU1 connect -------- ------------ WRITE_ONCE(sk->sk_state, TCP_ESTABLISHED) sock_map_sk_state_allowed(sk) ... sk_pair = unix_peer(sk) sock_hold(sk_pair) sock_hold(newsk) smp_mb__after_atomic() unix_peer(sk) = newsk BUG: kernel NULL pointer dereference, address: 0000000000000080 RIP: 0010:unix_stream_bpf_update_proto+0xa0/0x1b0 Call Trace: sock_map_link+0x564/0x8b0 sock_map_update_common+0x6e/0x340 sock_map_update_elem_sys+0x17d/0x240 __sys_bpf+0x26db/0x3250 __x64_sys_bpf+0x21/0x30 do_syscall_64+0x6b/0x3a0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Initial idea was to move peer assignment _before_ the sk_state update[1], but that involved an additional memory barrier, and changing the hot path was rejected. Then a NULL check during proto update in unix_stream_bpf_update_proto() was considered[2], but the follow-up discussion[3] focused on the root cause, i.e. sockmap update taking a wrong lock. Or, more specifically, missing unix_state_lock()[4]. In the end it was concluded that teaching sockmap about the af_unix locking would be unnecessarily complex[5]. Complexity aside, since BPF_PROG_TYPE_SCHED_CLS and BPF_PROG_TYPE_SCHED_ACT are allowed to update sockmaps, sock_map_update_elem() taking the unix lock, as it is currently implemented in unix_state_lock(): spin_lock(&unix_sk(s)->lock), would be problematic. unix_state_lock() taken in a process context, followed by a softirq-context TC BPF program attempting to take the same spinlock -- deadlock[6]. This way we circled back to the peer check idea[2]. [1]: https://lore.kernel.org/netdev/ba5c50aa-1df4-40c2-ab33-a72022c5a32e@rbox.co/ [2]: https://lore.kernel.org/netdev/20240610174906.32921-1-kuniyu@amazon.com/ [3]: https://lore.kernel.org/netdev/7603c0e6-cd5b-452b-b710-73b64bd9de26@linux.dev/ [4]: https://lore.kernel.org/netdev/CAAVpQUA+8GL_j63CaKb8hbxoL21izD58yr1NvhOhU=j+35+3og@mail.gmail.com/ [5]: https://lore.kernel.org/bpf/CAAVpQUAHijOMext28Gi10dSLuMzGYh+jK61Ujn+fZ-wvcODR2A@mail.gmail.com/ [6]: https://lore.kernel.org/bpf/dd043c69-4d03-46fe-8325-8f97101435cf@linux.dev/ Summary of scenarios where af_unix/stream connect() may race a sockmap update: 1. connect() vs. bpf(BPF_MAP_UPDATE_ELEM), i.e. sock_map_update_elem_sys() Implemented NULL check is sufficient. Once assigned, socket peer won't be released until socket fd is released. And that's not an issue because sock_map_update_elem_sys() bumps fd refcnf. 2. connect() vs BPF program doing update Update restricted per verifier.c:may_update_sockmap() to BPF_PROG_TYPE_TRACING/BPF_TRACE_ITER BPF_PROG_TYPE_SOCK_OPS (bpf_sock_map_update() only) BPF_PROG_TYPE_SOCKET_FILTER BPF_PROG_TYPE_SCHED_CLS BPF_PROG_TYPE_SCHED_ACT BPF_PROG_TYPE_XDP BPF_PROG_TYPE_SK_REUSEPORT BPF_PROG_TYPE_FLOW_DISSECTOR BPF_PROG_TYPE_SK_LOOKUP Plus one more race to consider: CPU0 bpf CPU1 connect -------- ------------ WRITE_ONCE(sk->sk_state, TCP_ESTABLISHED) sock_map_sk_state_allowed(sk) sock_hold(newsk) smp_mb__after_atomic() ---truncated---
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.15版本存在安全漏洞，该漏洞源于bpf和sockmap在unix_stream_connect中设置sk_state后未正确检查peer，导致空指针取消引用，可能导致系统崩溃。以下版本受到影响：5.15版本。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
Linux Linux c63829182c37c2d6d0608976d15fa61ebebe9e6b ~ 75b7d3b3f8bd4e59eb3af1b11a43c64c0c2db6f4 -
Linux Linux 5.15 -

二、漏洞 CVE-2026-53034 的公开POC

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三、漏洞 CVE-2026-53034 的情报信息

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CVE-2026-53034 补丁与修复 (6)

同批安全公告 · Linux · 2026-06-24 · 共 219 条

CVE-2026-53049 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52993 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52989 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52986 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52982 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53002 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53086 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53045 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53006 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53046 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52955 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53010 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53088 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52924 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52931 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53055 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52914 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-52958 9.1 CRITICAL Linux kernel 安全漏洞
CVE-2026-53043 9.1 CRITICAL Linux kernel 安全漏洞
CVE-2026-52999 9.1 CRITICAL Linux kernel 安全漏洞

显示前 20 条，共 219 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53034

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