CVE-2024-41045— 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，该漏洞源于在 bpf_timer_cancel_and_free 中，如果两个定时器回调尝试相互取消，或者释放包含定时器的映射元素时，可能发生死锁。
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b00628b1c7d595ae5b544e059c27b1f5828314b4< 5eaa11c500ed07f505f86cec07d5593a71927e26 |
affected |
b00628b1c7d595ae5b544e059c27b1f5828314b4< 7aa5a19279c3639ae8b758b63f05d0c616a39fa1 |
affected | ||
b00628b1c7d595ae5b544e059c27b1f5828314b4< a6fcd19d7eac1335eb76bc16b6a66b7f574d1d69 |
affected | ||
5.15 |
affected | ||
< 5.15 |
unaffected | ||
6.6.158≤ 6.6.* |
unaffected | ||
6.9.10≤ 6.9.* |
unaffected | ||
6.10≤ * |
unaffected |
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一、 漏洞 CVE-2024-41045 基础信息
漏洞信息
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Vulnerability Title
bpf: Defer work in bpf_timer_cancel_and_free
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Defer work in bpf_timer_cancel_and_free
Currently, the same case as previous patch (two timer callbacks trying
to cancel each other) can be invoked through bpf_map_update_elem as
well, or more precisely, freeing map elements containing timers. Since
this relies on hrtimer_cancel as well, it is prone to the same deadlock
situation as the previous patch.
It would be sufficient to use hrtimer_try_to_cancel to fix this problem,
as the timer cannot be enqueued after async_cancel_and_free. Once
async_cancel_and_free has been done, the timer must be reinitialized
before it can be armed again. The callback running in parallel trying to
arm the timer will fail, and freeing bpf_hrtimer without waiting is
sufficient (given kfree_rcu), and bpf_timer_cb will return
HRTIMER_NORESTART, preventing the timer from being rearmed again.
However, there exists a UAF scenario where the callback arms the timer
before entering this function, such that if cancellation fails (due to
timer callback invoking this routine, or the target timer callback
running concurrently). In such a case, if the timer expiration is
significantly far in the future, the RCU grace period expiration
happening before it will free the bpf_hrtimer state and along with it
the struct hrtimer, that is enqueued.
Hence, it is clear cancellation needs to occur after
async_cancel_and_free, and yet it cannot be done inline due to deadlock
issues. We thus modify bpf_timer_cancel_and_free to defer work to the
global workqueue, adding a work_struct alongside rcu_head (both used at
_different_ points of time, so can share space).
Update existing code comments to reflect the new state of affairs.
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，该漏洞源于在 bpf_timer_cancel_and_free 中，如果两个定时器回调尝试相互取消，或者释放包含定时器的映射元素时，可能发生死锁。
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-2024-41045 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-41045 补丁与修复 (1)
CVE-2024-41045 其他参考 (2)
同批安全公告 · Linux · 2024-07-29 · 共 121 条
| CVE-2024-41073 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-41040 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-41081 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-41091 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41046 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42083 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41090 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41062 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41070 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41049 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41057 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41060 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41059 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42075 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41064 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42072 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41069 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41086 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42066 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42064 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 121 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-41045
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