sched/deadline: Fix task_struct reference leak
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.
CVE-2024-41023
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-41023
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "feff2e65efd8d84cf831668e182b2ce73c604bbb",
"lessThan": "f8005214946fd1d9fefdeff19c6ce46d60de2cef",
"versionType": "git"
},
{
"status": "affected",
"version": "feff2e65efd8d84cf831668e182b2ce73c604bbb",
"lessThan": "7a54d31face626f62de415ebe77b43f76c3ffaf4",
"versionType": "git"
},
{
"status": "affected",
"version": "feff2e65efd8d84cf831668e182b2ce73c604bbb",
"lessThan": "b58652db66c910c2245f5bee7deca41c12d707b9",
"versionType": "git"
},
{
"status": "affected",
"version": "f0e1c1d8ff908a39dd42e723d08f104505dfa601",
"versionType": "git"
},
{
"status": "affected",
"version": "184c8ab5342450c4ae6fc5d937f9bb06c620dcf1",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.257",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.212",
"lessThan": "5.5",
"versionType": "semver"
}
],
"programFiles": [
"kernel/sched/deadline.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.9.10",
"versionType": "semver",
"lessThanOrEqual": "6.9.*"
},
{
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/sched/deadline.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-41023
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #45886 · Revision 1
- Added to Heist Feed
- Publisher date