CVE-2024-41023sched/deadline: Fix task_struct reference leak
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In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Fix task_struct reference leak During the execution of the following stress test with linux-rt: stress-ng --cyclic 30 --timeout 30 --minimize --quiet kmemleak frequently reported a memory leak concerning the task_struct: unreferenced object 0xffff8881305b8000 (size 16136): comm "stress-ng", pid 614, jiffies 4294883961 (age 286.412s) object hex dump (first 32 bytes): 02 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .@.............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ debug hex dump (first 16 bytes): 53 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 S............... backtrace: [<00000000046b6790>] dup_task_struct+0x30/0x540 [<00000000c5ca0f0b>] copy_process+0x3d9/0x50e0 [<00000000ced59777>] kernel_clone+0xb0/0x770 [<00000000a50befdc>] __do_sys_clone+0xb6/0xf0 [<000000001dbf2008>] do_syscall_64+0x5d/0xf0 [<00000000552900ff>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 The issue occurs in start_dl_timer(), which increments the task_struct reference count and sets a timer. The timer callback, dl_task_timer, is supposed to decrement the reference count upon expiration. However, if enqueue_task_dl() is called before the timer expires and cancels it, the reference count is not decremented, leading to the leak. This patch fixes the reference leak by ensuring the task_struct reference count is properly decremented when the timer is canceled.
- 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 21, 2026
- First seen by InfoSec Signals
- Oct 21, 2026
Affected products
Linux Linux linux:linux (from the name) | from feff2e65efd8d84cf831668e182b2ce73c604bbb before f8005214946fd1d9fefdeff19c6ce46d60de2cef; from feff2e65efd8d84cf831668e182b2ce73c604bbb before 7a54d31face626f62de415ebe77b43f76c3ffaf4; from feff2e65efd8d84cf831668e182b2ce73c604bbb before b58652db66c910c2245f5bee7deca41c12d707b9; f0e1c1d8ff908a39dd42e723d08f104505dfa601; 184c8ab5342450c4ae6fc5d937f9bb06c620dcf1; from 4.19.257 before 4.20; from 5.4.212 before 5.5 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.19.257 before 4.20; from 5.4.212 before 5.5; from 5.10 before 6.9.10; 6.10; 6.10; 6.10; 6.10; 6.10; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/f8005214946fd1d9fefdeff19c6ce46d60de2cef
- https://git.kernel.org/stable/c/7a54d31face626f62de415ebe77b43f76c3ffaf4patch
- https://git.kernel.org/stable/c/b58652db66c910c2245f5bee7deca41c12d707b9patch
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.