CVE-2026-43050— 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atm lec驱动中lec_atm_close函数未同步清除priv->lecd指针，导致并发访问时在sock_def_readable中发生释放后重用。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3e8b25f32f2f35549d03d77da030a24a45bdef5b |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 750a33f417f3d196b86375f8d9f8938bacf130fe |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 317843d5355062020649124eb4a0d7acbcc3f53e |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b256d055da47258e63f8b40965f276c5f23d229a |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3989740fa4978e1d2d51ecc62be1b01093e104ad |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< abc10f85a3965ac14b9ed7ad3e67b35604a63aa3 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5fbbb1ff936d7ff9528d929c1549977e8123d8a8 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 922814879542c2e397b0e9641fd36b8202a8e555 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-43050 基础信息
漏洞信息
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Vulnerability Title
atm: lec: fix use-after-free in sock_def_readable()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
atm: lec: fix use-after-free in sock_def_readable()
A race condition exists between lec_atm_close() setting priv->lecd
to NULL and concurrent access to priv->lecd in send_to_lecd(),
lec_handle_bridge(), and lec_atm_send(). When the socket is freed
via RCU while another thread is still using it, a use-after-free
occurs in sock_def_readable() when accessing the socket's wait queue.
The root cause is that lec_atm_close() clears priv->lecd without
any synchronization, while callers dereference priv->lecd without
any protection against concurrent teardown.
Fix this by converting priv->lecd to an RCU-protected pointer:
- Mark priv->lecd as __rcu in lec.h
- Use rcu_assign_pointer() in lec_atm_close() and lecd_attach()
for safe pointer assignment
- Use rcu_access_pointer() for NULL checks that do not dereference
the pointer in lec_start_xmit(), lec_push(), send_to_lecd() and
lecd_attach()
- Use rcu_read_lock/rcu_dereference/rcu_read_unlock in send_to_lecd(),
lec_handle_bridge() and lec_atm_send() to safely access lecd
- Use rcu_assign_pointer() followed by synchronize_rcu() in
lec_atm_close() to ensure all readers have completed before
proceeding. This is safe since lec_atm_close() is called from
vcc_release() which holds lock_sock(), a sleeping lock.
- Remove the manual sk_receive_queue drain from lec_atm_close()
since vcc_destroy_socket() already drains it after lec_atm_close()
returns.
v2: Switch from spinlock + sock_hold/put approach to RCU to properly
fix the race. The v1 spinlock approach had two issues pointed out
by Eric Dumazet:
1. priv->lecd was still accessed directly after releasing the
lock instead of using a local copy.
2. The spinlock did not prevent packets being queued after
lec_atm_close() drains sk_receive_queue since timer and
workqueue paths bypass netif_stop_queue().
Note: Syzbot patch testing was attempted but the test VM terminated
unexpectedly with "Connection to localhost closed by remote host",
likely due to a QEMU AHCI emulation issue unrelated to this fix.
Compile testing with "make W=1 net/atm/lec.o" passes cleanly.
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atm lec驱动中lec_atm_close函数未同步清除priv->lecd指针，导致并发访问时在sock_def_readable中发生释放后重用。
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-2026-43050 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-43050 补丁与修复 (8)
同批安全公告 · Linux · 2026-05-01 · 共 146 条
| CVE-2026-43011 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31705 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43037 | 9.8 CRITICAL | Linux kernel 缓冲区错误漏洞 |
| CVE-2026-43038 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31718 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31735 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43018 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31773 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31739 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31717 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31709 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43048 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31706 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31712 | 8.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31708 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31779 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43051 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31771 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31772 | 7.8 HIGH | Linux kernel 安全漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-43050
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