CVE-2024-41023: sched/deadline: Fix task_struct reference leak
First published: Mon Jul 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.9.10 | 6.9.10 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.112-1 | 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/7a54d31face626f62de415ebe77b43f76c3ffaf4
- https://git.kernel.org/stable/c/b58652db66c910c2245f5bee7deca41c12d707b9
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41023
- https://nvd.nist.gov/vuln/detail/CVE-2024-41023
- https://launchpad.net/bugs/cve/CVE-2024-41023
- https://security-tracker.debian.org/tracker/CVE-2024-41023
- https://ubuntu.com/security/CVE-2024-41023
- https://git.kernel.org/linus/b58652db66c910c2245f5bee7deca41c12d707b9
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2300928
- https://access.redhat.com/errata/RHSA-2024:6745
- https://access.redhat.com/errata/RHSA-2024:6744
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:9546
- https://bugzilla.redhat.com/show_bug.cgi?id=2300381
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