CVE-2026-31507— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tee操作重复splice管道缓冲区时导致smc_spd_priv双重释放，可能导致释放后重用。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 7e8916f46c2f48607f907fd401590093753a6bc5 |
affected |
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< ae5575e660410c8d2c5d38fb28a0f37aea945676 |
affected | ||
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 98ba5cb274768146e25ffbfde47753652c1c20d3 |
affected | ||
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 81acbd345d405994875d419d43b319fee0b9ad62 |
affected | ||
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 7bcb974c771c863e8588cea0012ac204443a7126 |
affected | ||
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 54c87a730157868543ebdfa0ecb21b4590ed23a5 |
affected | ||
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 3cc76380fea749280c026f410af56a28aaac388a |
affected | ||
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 24dd586bb4cbba1889a50abe74143817a095c1c9 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-31507 基础信息
漏洞信息
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Vulnerability Title
net/smc: fix double-free of smc_spd_priv when tee() duplicates splice pipe buffer
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix double-free of smc_spd_priv when tee() duplicates splice pipe buffer
smc_rx_splice() allocates one smc_spd_priv per pipe_buffer and stores
the pointer in pipe_buffer.private. The pipe_buf_operations for these
buffers used .get = generic_pipe_buf_get, which only increments the page
reference count when tee(2) duplicates a pipe buffer. The smc_spd_priv
pointer itself was not handled, so after tee() both the original and the
cloned pipe_buffer share the same smc_spd_priv *.
When both pipes are subsequently released, smc_rx_pipe_buf_release() is
called twice against the same object:
1st call: kfree(priv) sock_put(sk) smc_rx_update_cons() [correct]
2nd call: kfree(priv) sock_put(sk) smc_rx_update_cons() [UAF]
KASAN reports a slab-use-after-free in smc_rx_pipe_buf_release(), which
then escalates to a NULL-pointer dereference and kernel panic via
smc_rx_update_consumer() when it chases the freed priv->smc pointer:
BUG: KASAN: slab-use-after-free in smc_rx_pipe_buf_release+0x78/0x2a0
Read of size 8 at addr ffff888004a45740 by task smc_splice_tee_/74
Call Trace:
<TASK>
dump_stack_lvl+0x53/0x70
print_report+0xce/0x650
kasan_report+0xc6/0x100
smc_rx_pipe_buf_release+0x78/0x2a0
free_pipe_info+0xd4/0x130
pipe_release+0x142/0x160
__fput+0x1c6/0x490
__x64_sys_close+0x4f/0x90
do_syscall_64+0xa6/0x1a0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
BUG: kernel NULL pointer dereference, address: 0000000000000020
RIP: 0010:smc_rx_update_consumer+0x8d/0x350
Call Trace:
<TASK>
smc_rx_pipe_buf_release+0x121/0x2a0
free_pipe_info+0xd4/0x130
pipe_release+0x142/0x160
__fput+0x1c6/0x490
__x64_sys_close+0x4f/0x90
do_syscall_64+0xa6/0x1a0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
Kernel panic - not syncing: Fatal exception
Beyond the memory-safety problem, duplicating an SMC splice buffer is
semantically questionable: smc_rx_update_cons() would advance the
consumer cursor twice for the same data, corrupting receive-window
accounting. A refcount on smc_spd_priv could fix the double-free, but
the cursor-accounting issue would still need to be addressed separately.
The .get callback is invoked by both tee(2) and splice_pipe_to_pipe()
for partial transfers; both will now return -EFAULT. Users who need
to duplicate SMC socket data must use a copy-based read path.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tee操作重复splice管道缓冲区时导致smc_spd_priv双重释放，可能导致释放后重用。
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-2026-31507 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-04-22 · 共 100 条
| CVE-2026-31478 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31463 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31444 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31436 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31501 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31448 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31450 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31432 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31433 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31435 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31476 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31464 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31513 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31488 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31494 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31454 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31502 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31479 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31504 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31505 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 100 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31507
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