CVE-2024-50154— 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，该漏洞源于内存释放后重用。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< 106e457953315e476b3642ef24be25ed862aaba3 |
affected |
83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< c964bf65f80a14288d767023a1b300b30f5b9cd0 |
affected | ||
83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< 8459d61fbf24967839a70235165673148c7c7f17 |
affected | ||
83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< 5071beb59ee416e8ab456ac8647a4dabcda823b1 |
affected | ||
83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< 997ae8da14f1639ce6fb66a063dab54031cd61b3 |
affected | ||
83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< 51e34db64f4e43c7b055ccf881b7f3e0c31bb26d |
affected | ||
83fccfc3940c4a2db90fd7e7079f5b465cd8c6af< e8c526f2bdf1845bedaf6a478816a3d06fa78b8f |
affected | ||
d3a1196bfc462943694623412d8e03aaf172bdc1 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2024-50154 基础信息
漏洞信息
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Vulnerability Title
tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().
Martin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().
"""
We are seeing a use-after-free from a bpf prog attached to
trace_tcp_retransmit_synack. The program passes the req->sk to the
bpf_sk_storage_get_tracing kernel helper which does check for null
before using it.
"""
The commit 83fccfc3940c ("inet: fix potential deadlock in
reqsk_queue_unlink()") added timer_pending() in reqsk_queue_unlink() not
to call del_timer_sync() from reqsk_timer_handler(), but it introduced a
small race window.
Before the timer is called, expire_timers() calls detach_timer(timer, true)
to clear timer->entry.pprev and marks it as not pending.
If reqsk_queue_unlink() checks timer_pending() just after expire_timers()
calls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will
continue running and send multiple SYN+ACKs until it expires.
The reported UAF could happen if req->sk is close()d earlier than the timer
expiration, which is 63s by default.
The scenario would be
1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),
but del_timer_sync() is missed
2. reqsk timer is executed and scheduled again
3. req->sk is accept()ed and reqsk_put() decrements rsk_refcnt, but
reqsk timer still has another one, and inet_csk_accept() does not
clear req->sk for non-TFO sockets
4. sk is close()d
5. reqsk timer is executed again, and BPF touches req->sk
Let's not use timer_pending() by passing the caller context to
__inet_csk_reqsk_queue_drop().
Note that reqsk timer is pinned, so the issue does not happen in most
use cases. [1]
[0]
BUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0
Use-after-free read at 0x00000000a891fb3a (in kfence-#1):
bpf_sk_storage_get_tracing+0x2e/0x1b0
bpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda
bpf_trace_run2+0x4c/0xc0
tcp_rtx_synack+0xf9/0x100
reqsk_timer_handler+0xda/0x3d0
run_timer_softirq+0x292/0x8a0
irq_exit_rcu+0xf5/0x320
sysvec_apic_timer_interrupt+0x6d/0x80
asm_sysvec_apic_timer_interrupt+0x16/0x20
intel_idle_irq+0x5a/0xa0
cpuidle_enter_state+0x94/0x273
cpu_startup_entry+0x15e/0x260
start_secondary+0x8a/0x90
secondary_startup_64_no_verify+0xfa/0xfb
kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6
allocated by task 0 on cpu 9 at 260507.901592s:
sk_prot_alloc+0x35/0x140
sk_clone_lock+0x1f/0x3f0
inet_csk_clone_lock+0x15/0x160
tcp_create_openreq_child+0x1f/0x410
tcp_v6_syn_recv_sock+0x1da/0x700
tcp_check_req+0x1fb/0x510
tcp_v6_rcv+0x98b/0x1420
ipv6_list_rcv+0x2258/0x26e0
napi_complete_done+0x5b1/0x2990
mlx5e_napi_poll+0x2ae/0x8d0
net_rx_action+0x13e/0x590
irq_exit_rcu+0xf5/0x320
common_interrupt+0x80/0x90
asm_common_interrupt+0x22/0x40
cpuidle_enter_state+0xfb/0x273
cpu_startup_entry+0x15e/0x260
start_secondary+0x8a/0x90
secondary_startup_64_no_verify+0xfa/0xfb
freed by task 0 on cpu 9 at 260507.927527s:
rcu_core_si+0x4ff/0xf10
irq_exit_rcu+0xf5/0x320
sysvec_apic_timer_interrupt+0x6d/0x80
asm_sysvec_apic_timer_interrupt+0x16/0x20
cpuidle_enter_state+0xfb/0x273
cpu_startup_entry+0x15e/0x260
start_secondary+0x8a/0x90
secondary_startup_64_no_verify+0xfa/0xfb
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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，该漏洞源于内存释放后重用。
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-2024-50154 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-50154 补丁与修复 (7)
同批安全公告 · Linux · 2024-11-07 · 共 34 条
| CVE-2024-50162 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50152 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50139 | 7.9 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50150 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50161 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50158 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50164 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50165 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50151 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50149 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50143 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50141 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50145 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50170 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50159 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50167 | Linux kernel 安全漏洞 | |
| CVE-2024-50156 | Linux kernel 安全漏洞 | |
| CVE-2024-50168 | Linux kernel 安全漏洞 | |
| CVE-2024-50169 | Linux kernel 安全漏洞 | |
| CVE-2024-50166 | Linux kernel 安全漏洞 |
显示前 20 条，共 34 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-50154
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