CVE-2024-40995net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
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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
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | 0190c1d452a91c38a3462abdd81752be1b9006a8 builds before 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74; from 0190c1d452a91c38a3462abdd81752be1b9006a8 before c6a7da65a296745535a964be1019ec7691b0cb90; from 0190c1d452a91c38a3462abdd81752be1b9006a8 before 25987a97eec4d5f897cd04ee1b45170829c610da; 0190c1d452a91c38a3462abdd81752be1b9006a8 builds before 6fc78d67f51aeb9a542d39a8714e16bc411582d4; 0190c1d452a91c38a3462abdd81752be1b9006a8 builds before 5f926aa96b08b6c47178fe1171e7ae331c695fc2; 0190c1d452a91c38a3462abdd81752be1b9006a8 builds before 7a0e497b597df7c4cf2b63fc6e9188b6cabe5335; from 0190c1d452a91c38a3462abdd81752be1b9006a8 before d864319871b05fadd153e0aede4811ca7008f5d6 | CNA record |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V3.1 | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | before V3.1 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.19 before 5.4.279; from 5.5 before 5.10.221; from 5.11 before 5.15.162; from 5.16 before 6.1.96; from 6.2 before 6.6.36; from 6.7 before 6.9.7; 6.10; 6.10; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74patch
- https://git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90patch
- https://git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610dapatch
- https://git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4patch
- https://git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2patch
- https://git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335patch
- https://git.kernel.org/stable/c/d864319871b05fadd153e0aede4811ca7008f5d6patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.