CVE-2024-40995net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()
- 5.5MediumCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 79% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.29% · top 79% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < c6a7da65a296745535a964be1019ec7691b0cb90
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < 25987a97eec4d5f897cd04ee1b45170829c610da
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < 6fc78d67f51aeb9a542d39a8714e16bc411582d4
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < 5f926aa96b08b6c47178fe1171e7ae331c695fc2
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < 7a0e497b597df7c4cf2b63fc6e9188b6cabe5335
- affected 0190c1d452a91c38a3462abdd81752be1b9006a8 – < d864319871b05fadd153e0aede4811ca7008f5d6
- affected 4.19
- unaffected < 4.19
- unaffected 5.4.279 – ≤ 5.4.*
- unaffected 5.10.221 – ≤ 5.10.*
- unaffected 5.15.162 – ≤ 5.15.*
- unaffected 6.1.96 – ≤ 6.1.*
- unaffected 6.6.36 – ≤ 6.6.*
- unaffected 6.9.7 – ≤ 6.9.*
- unaffected 6.10 – ≤ *
References
References11
- https://git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610da (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d864319871b05fadd153e0aede4811ca7008f5d6 (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-38790 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-40995)Record last updated .