Linux Kernel up to 6.2.10 sched_switch use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 5.4.240/5.10.177/5.15.106/6.1.23/6.2.10. This vulnerability affects the function sched_switch. Executing a manipulation can lead to use after free. The identification of this vulnerability is CVE-2023-53375. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.4.240/5.10.177/5.15.106/6.1.23/6.2.10. It has been declared as critical. This vulnerability affects the function sched_switch. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2023-53375 since 09/17/2025. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/12/2025).

The vulnerability scanner Nessus provides a plugin with the ID 265544 (Linux Distros Unpatched Vulnerability : CVE-2023-53375), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.241, 5.10.178, 5.15.107, 6.1.24 or 6.2.11 eliminates this vulnerability. Applying the patch 987f599fc556a4e64c405d8dde32c70311e8c278/6e36373aa5ffa8e00fe7c71b3209f6f17081e552/33d5d4e67a0e13c3ca6257fa67bf6503bc000878/c0cf0f55be043ef67c38f492aa37ed1986d2f6b6/46771c34d6721abfd9e7903eaed2201051eebec6/3357c6e429643231e60447b52ffbb7ac895aca22 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265544) and CERT Bund (WID-SEC-2025-2092). Once again VulDB remains the best source for vulnerability data.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265544
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53375

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.241/5.10.178/5.15.107/6.1.24/6.2.11
Patch: 987f599fc556a4e64c405d8dde32c70311e8c278/6e36373aa5ffa8e00fe7c71b3209f6f17081e552/33d5d4e67a0e13c3ca6257fa67bf6503bc000878/c0cf0f55be043ef67c38f492aa37ed1986d2f6b6/46771c34d6721abfd9e7903eaed2201051eebec6/3357c6e429643231e60447b52ffbb7ac895aca22

Timelineinfo

09/17/2025 CVE reserved
09/18/2025 +1 days Advisory disclosed
09/18/2025 +0 days VulDB entry created
12/12/2025 +85 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53375 (🔒)
GCVE (CVE): GCVE-0-2023-53375
GCVE (VulDB): GCVE-100-324844
CERT Bund: WID-SEC-2025-2092 - Linux Kernel: Mehrere Schwachstellen erm&ouml;glichen Denial of Service

Entryinfo

Created: 09/18/2025 16:22
Updated: 12/12/2025 19:11
Changes: 09/18/2025 16:22 (58), 09/20/2025 04:02 (7), 09/21/2025 23:19 (2), 11/29/2025 16:14 (1), 12/12/2025 19:11 (12)
Complete: 🔍
Cache ID: 216::103

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