Answer in brief
CVE-2024-40995 records a Unknown severity vulnerability in net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XCM-/XRM-/XCH-/XRH-300 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XCM-/XRM-/XCH-/XRH-300 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0190c1d452a91c38a3462abdd81752be1b9006a8 <0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <c6a7da65a296745535a964be1019ec7691b0cb90 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <25987a97eec4d5f897cd04ee1b45170829c610da || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <6fc78d67f51aeb9a542d39a8714e16bc411582d4 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <5f926aa96b08b6c47178fe1171e7ae331c695fc2 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <7a0e497b597df7c4cf2b63fc6e9188b6cabe5335 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <d864319871b05fadd153e0aede4811ca7008f5d6 | 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74, c6a7da65a296745535a964be1019ec7691b0cb90, 25987a97eec4d5f897cd04ee1b45170829c610da, 6fc78d67f51aeb9a542d39a8714e16bc411582d4, 5f926aa96b08b6c47178fe1171e7ae331c695fc2, 7a0e497b597df7c4cf2b63fc6e9188b6cabe5335, d864319871b05fadd153e0aede4811ca7008f5d6 |
| Linux/Linuxgeneric | 4.19 | Not reported |
| Siemens/RUGGEDCOM RST2428Pgeneric | >=0 <V3.1 | V3.1 |
| Siemens/SCALANCE XCM-/XRM-/XCH-/XRH-300 familygeneric | >=0 <V3.1 | V3.1 |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <V1.1.1 | V1.1.1 |
Published upstream
Jul 12, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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
Quoted source text, attributed separately from HOL analysis.