Memory Leak Affecting kernel-default-devel package, versions <5.14.21-150400.24.179.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES154-KERNELDEFAULTDEVEL-13625636
- published18 Oct 2025
- disclosed17 Oct 2025
Introduced: 17 Oct 2025
CVE-2023-53375 (opens in a new tab)How to fix?
Upgrade SLES:15.4 kernel-default-devel to version 5.14.21-150400.24.179.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-default-devel package and not the kernel-default-devel package as distributed by SLES.
See How to fix? for SLES:15.4 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
tracing: Free error logs of tracing instances
When a tracing instance is removed, the error messages that hold errors that occurred in the instance needs to be freed. The following reports a memory leak:
cd /sys/kernel/tracing
mkdir instances/foo
echo 'hist:keys=x' > instances/foo/events/sched/sched_switch/trigger
cat instances/foo/error_log
[ 117.404795] hist:sched:sched_switch: error: Couldn't find field Command: hist:keys=x ^
rmdir instances/foo
Then check for memory leaks:
echo scan > /sys/kernel/debug/kmemleak
cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff88810d8ec700 (size 192):
comm "bash", pid 869, jiffies 4294950577 (age 215.752s)
hex dump (first 32 bytes):
60 dd 68 61 81 88 ff ff 60 dd 68 61 81 88 ff ff .ha.....ha....
a0 30 8c 83 ff ff ff ff 26 00 0a 00 00 00 00 00 .0......&.......
backtrace:
[<00000000dae26536>] kmalloc_trace+0x2a/0xa0
[<00000000b2938940>] tracing_log_err+0x277/0x2e0
[<000000004a0e1b07>] parse_atom+0x966/0xb40
[<0000000023b24337>] parse_expr+0x5f3/0xdb0
[<00000000594ad074>] event_hist_trigger_parse+0x27f8/0x3560
[<00000000293a9645>] trigger_process_regex+0x135/0x1a0
[<000000005c22b4f2>] event_trigger_write+0x87/0xf0
[<000000002cadc509>] vfs_write+0x162/0x670
[<0000000059c3b9be>] ksys_write+0xca/0x170
[<00000000f1cddc00>] do_syscall_64+0x3e/0xc0
[<00000000868ac68c>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
unreferenced object 0xffff888170c35a00 (size 32):
comm "bash", pid 869, jiffies 4294950577 (age 215.752s)
hex dump (first 32 bytes):
0a 20 20 43 6f 6d 6d 61 6e 64 3a 20 68 69 73 74 . Command: hist
3a 6b 65 79 73 3d 78 0a 00 00 00 00 00 00 00 00 :keys=x.........
backtrace:
[<000000006a747de5>] __kmalloc+0x4d/0x160
[<000000000039df5f>] tracing_log_err+0x29b/0x2e0
[<000000004a0e1b07>] parse_atom+0x966/0xb40
[<0000000023b24337>] parse_expr+0x5f3/0xdb0
[<00000000594ad074>] event_hist_trigger_parse+0x27f8/0x3560
[<00000000293a9645>] trigger_process_regex+0x135/0x1a0
[<000000005c22b4f2>] event_trigger_write+0x87/0xf0
[<000000002cadc509>] vfs_write+0x162/0x670
[<0000000059c3b9be>] ksys_write+0xca/0x170
[<00000000f1cddc00>] do_syscall_64+0x3e/0xc0
[<00000000868ac68c>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
The problem is that the error log needs to be freed when the instance is removed.
References
- https://www.suse.com/security/cve/CVE-2023-53375.html
- https://bugzilla.suse.com/1250197
- https://git.kernel.org/stable/c/3357c6e429643231e60447b52ffbb7ac895aca22
- https://git.kernel.org/stable/c/33d5d4e67a0e13c3ca6257fa67bf6503bc000878
- https://git.kernel.org/stable/c/46771c34d6721abfd9e7903eaed2201051eebec6
- https://git.kernel.org/stable/c/6e36373aa5ffa8e00fe7c71b3209f6f17081e552
- https://git.kernel.org/stable/c/987f599fc556a4e64c405d8dde32c70311e8c278
- https://git.kernel.org/stable/c/c0cf0f55be043ef67c38f492aa37ed1986d2f6b6