CVE-2026-80852— 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基金会开源的一个操作系统内核。 Linux kernel 4.18版本存在安全漏洞，该漏洞源于tls_append_frag()函数未检查分段数量导致越界写入，可能导致系统崩溃或执行任意代码。
可能的 ATT&CK 技术 1 AI
T1683 · Generate Content影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | e8f69799810c32dd40c6724d829eccc70baad07f< 03ced5da6120965d80ed56dbb7d78fa5c9128906 |
affected |
e8f69799810c32dd40c6724d829eccc70baad07f< a832d7cb09da2a8e4e9734b4be14d3e76169d805 |
affected | ||
e8f69799810c32dd40c6724d829eccc70baad07f< b7f10d4ff987bda038df90052cd4a1434a7412d4 |
affected | ||
e8f69799810c32dd40c6724d829eccc70baad07f< fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e |
affected | ||
e8f69799810c32dd40c6724d829eccc70baad07f< cd7e875b89597f3498917af764758391338d1802 |
affected | ||
e8f69799810c32dd40c6724d829eccc70baad07f< 7e1208c135618358da5d7d6664874dc6e53c62fc |
affected | ||
e8f69799810c32dd40c6724d829eccc70baad07f< b17cf742eaad70ae29ac558cefb3aa9bbeea03d4 |
affected | ||
4.18 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-80852 基础信息
漏洞信息
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Vulnerability Title
tls: device: fix out-of-bounds write in tls_append_frag()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tls: device: fix out-of-bounds write in tls_append_frag()
Found with syzkaller and a local syzbot instance running on top of a
netdevsim TLS offload emulation; tls_device.c is otherwise only reachable
on a machine with a NIC that implements the offload.
tls_push_data() only checks whether the open record still has room for
another frag at the bottom of its loop, and the MSG_MORE early break
skips that check. The record survives to the next syscall with the frag
count it already had, and tls_append_frag() does not check either, so
with TLS_TX_ZEROCOPY_RO every splice(SPLICE_F_MORE) of a byte or two adds
a non-coalescing pipe page and num_frags walks off the end of
tls_record_info.frags[MAX_SKB_FRAGS]. Once the record is pushed,
tls_push_record() runs the same index over sg_tx_data[MAX_SKB_FRAGS] and
the sg_set_page() writes land on the destruct_work that follows it, which
the workqueue then calls.
The byte limit is fine because copy drops to 0 and the loop falls through
to the same check; the frag count has no such feedback.
Push the record rather than keep a full one open, which is what a plain
TCP socket does - tcp_sendmsg_locked() uses tcp_mark_push() and
new_segment in both the copy and the MSG_SPLICE_PAGES paths, and tls_sw
already sets full_record when the sk_msg ring fills up, MSG_MORE or not.
BUG: KASAN: slab-out-of-bounds in tls_append_frag ( net/tls/tls_device.c:269)
Write of size 8 at addr ffff8881104d1530 by task tls_oob/450
CPU: 2 UID: 0 PID: 450 Comm: tls_oob Not tainted 7.2.0-rc7+ #329 PREEMPT
Call Trace:
<TASK>
dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
kasan_report (mm/kasan/report.c:595)
tls_append_frag (net/tls/tls_device.c:269)
tls_push_data (net/tls/tls_device.c:518)
tls_device_sendmsg (net/tls/tls_device.c:583)
inet_sendmsg (net/ipv4/af_inet.c:865)
sock_sendmsg (net/socket.c:775 net/socket.c:790 net/socket.c:813)
splice_to_socket (fs/splice.c:884)
do_splice (fs/splice.c:936 fs/splice.c:1349)
__do_splice (fs/splice.c:1431)
__x64_sys_splice (fs/splice.c:1634 fs/splice.c:1616)
do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
</TASK>
and, once the record is pushed:
UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:300:24
index 18 is out of range for type 'skb_frag_t [17]'
UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41
index 18 is out of range for type 'scatterlist [17]'
UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39
index 18 is out of range for type 'scatterlist [17]'
UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38
index 26 is out of range for type 'scatterlist [17]'
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffffea000411a680
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
Oops: Oops: 0011 [#1] SMP KASAN PTI
Workqueue: ktls_device_destruct 0xffffea000411a680
RIP: 0010:0xffffea000411a680
Call Trace:
<TASK>
worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)
kthread (kernel/kthread.c:436)
ret_from_fork (arch/x86/kernel/process.c:158)
ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
</TASK>
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基金会开源的一个操作系统内核。 Linux kernel 4.18版本存在安全漏洞，该漏洞源于tls_append_frag()函数未检查分段数量导致越界写入，可能导致系统崩溃或执行任意代码。
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
二、漏洞 CVE-2026-80852 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80852 补丁与修复 (7)
同批安全公告 · Linux · 2026-09-04 · 共 156 条
| CVE-2026-80865 | Linux kernel 安全漏洞 | |
| CVE-2026-80856 | Linux kernel 安全漏洞 | |
| CVE-2026-80857 | Linux kernel 安全漏洞 | |
| CVE-2026-80858 | Linux kernel 安全漏洞 | |
| CVE-2026-80859 | Linux kernel 安全漏洞 | |
| CVE-2026-80860 | Linux kernel 安全漏洞 | |
| CVE-2026-80861 | Linux kernel 安全漏洞 | |
| CVE-2026-80862 | Linux kernel 安全漏洞 | |
| CVE-2026-80863 | Linux kernel 安全漏洞 | |
| CVE-2026-80864 | Linux kernel 安全漏洞 | |
| CVE-2026-80870 | Linux kernel 安全漏洞 | |
| CVE-2026-80874 | Linux kernel 安全漏洞 | |
| CVE-2026-80873 | Linux kernel 安全漏洞 | |
| CVE-2026-80872 | Linux kernel 安全漏洞 | |
| CVE-2026-80871 | Linux kernel 安全漏洞 | |
| CVE-2026-80868 | Linux kernel 安全漏洞 | |
| CVE-2026-80866 | Linux kernel 安全漏洞 | |
| CVE-2026-80867 | Linux kernel 安全漏洞 | |
| CVE-2026-80855 | Linux kernel 安全漏洞 | |
| CVE-2026-80869 | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80852
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