CVE-2024-40995

Advisory lineage Upstream: 0 Downstream: 45
Modified
Published: 12 Jul 2024, 12:37
Last modified:12 May 2026, 11:56

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
<0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

12 Jul 2024, 12:37
Published
Vulnerability first disclosed
12 May 2026, 11:56
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc() syzbot found hanging tasks waiting on rtnl_lock [1] A reproducer is available in the syzbot bug. When a request to add multiple actions with the same index is sent, the second request will block forever on the first request. This holds rtnl_lock, and causes tasks to hang. Return -EAGAIN to prevent infinite looping, while keeping documented behavior. [1] INFO: task kworker/1:0:5088 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: <TASK> context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wiphy_lock include/net/cfg80211.h:5953 [inline] reg_leave_invalid_chans net/wireless/reg.c:2466 [inline] reg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Techniques & Countermeasures

  • CWE-835•Loop with Unreachable Exit Condition ('Infinite Loop')

    The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected Systems

  • linux•linux

    ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74 | ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < c6a7da65a296745535a964be1019ec7691b0cb90 | ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < 25987a97eec4d5f897cd04ee1b45170829c610da | ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < 6fc78d67f51aeb9a542d39a8714e16bc411582d4 | ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < 5f926aa96b08b6c47178fe1171e7ae331c695fc2 | ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < 7a0e497b597df7c4cf2b63fc6e9188b6cabe5335 | ≥ 0190c1d452a91c38a3462abdd81752be1b9006a8, < d864319871b05fadd153e0aede4811ca7008f5d6 | 4.19

  • linux•linux_kernel

    ≥ 4.19, < 5.4.279 | ≥ 5.5, < 5.10.221 | ≥ 5.11, < 5.15.162 | ≥ 5.16, < 6.1.96 | ≥ 6.2, < 6.6.36 | ≥ 6.7, < 6.9.7 | 6.10:rc1 | 6.10:rc2 | 6.10:rc3 | 6.10:rc4

References (11)