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CVE-2023-53478— tracing/synthetic: Fix races on freeing last_cmd

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于last_cmd变量存在竞争条件，可能导致释放后重用或双重释放。

CVSS 7.8 · High EPSS 0.12% · P2 Updated Aug 05, 2026

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`27c888da9867725784bad3d6455d6e53b425fa2b< 9fe183f659a2704255e5d84f6ae308c234a113ec`	affected
		`27c888da9867725784bad3d6455d6e53b425fa2b< 8826d9e7bd51e7656f78baa4472e8e2f5e7069f0`	affected
		`27c888da9867725784bad3d6455d6e53b425fa2b< 4ccf11c4e8a8e051499d53a12f502196c97a758e`	affected
		`5.18`	affected
		`< 5.18`	unaffected
		`6.1.24≤ 6.1.*`	unaffected
		`6.2.11≤ 6.2.*`	unaffected
		`6.3≤ *`	unaffected

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I. Basic Information for CVE-2023-53478

Vulnerability Information

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Vulnerability Title

tracing/synthetic: Fix races on freeing last_cmd

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: tracing/synthetic: Fix races on freeing last_cmd Currently, the "last_cmd" variable can be accessed by multiple processes asynchronously when multiple users manipulate synthetic_events node at the same time, it could lead to use-after-free or double-free. This patch add "lastcmd_mutex" to prevent "last_cmd" from being accessed asynchronously. ================================================================ It's easy to reproduce in the KASAN environment by running the two scripts below in different shells. script 1: while : do echo -n -e '\x88' > /sys/kernel/tracing/synthetic_events done script 2: while : do echo -n -e '\xb0' > /sys/kernel/tracing/synthetic_events done ================================================================ double-free scenario: process A process B ------------------- --------------- 1.kstrdup last_cmd 2.free last_cmd 3.free last_cmd(double-free) ================================================================ use-after-free scenario: process A process B ------------------- --------------- 1.kstrdup last_cmd 2.free last_cmd 3.tracing_log_err(use-after-free) ================================================================ Appendix 1. KASAN report double-free: BUG: KASAN: double-free in kfree+0xdc/0x1d4 Free of addr ***** by task sh/4879 Call trace: ... kfree+0xdc/0x1d4 create_or_delete_synth_event+0x60/0x1e8 trace_parse_run_command+0x2bc/0x4b8 synth_events_write+0x20/0x30 vfs_write+0x200/0x830 ... Allocated by task 4879: ... kstrdup+0x5c/0x98 create_or_delete_synth_event+0x6c/0x1e8 trace_parse_run_command+0x2bc/0x4b8 synth_events_write+0x20/0x30 vfs_write+0x200/0x830 ... Freed by task 5464: ... kfree+0xdc/0x1d4 create_or_delete_synth_event+0x60/0x1e8 trace_parse_run_command+0x2bc/0x4b8 synth_events_write+0x20/0x30 vfs_write+0x200/0x830 ... ================================================================ Appendix 2. KASAN report use-after-free: BUG: KASAN: use-after-free in strlen+0x5c/0x7c Read of size 1 at addr ***** by task sh/5483 sh: CPU: 7 PID: 5483 Comm: sh ... __asan_report_load1_noabort+0x34/0x44 strlen+0x5c/0x7c tracing_log_err+0x60/0x444 create_or_delete_synth_event+0xc4/0x204 trace_parse_run_command+0x2bc/0x4b8 synth_events_write+0x20/0x30 vfs_write+0x200/0x830 ... Allocated by task 5483: ... kstrdup+0x5c/0x98 create_or_delete_synth_event+0x80/0x204 trace_parse_run_command+0x2bc/0x4b8 synth_events_write+0x20/0x30 vfs_write+0x200/0x830 ... Freed by task 5480: ... kfree+0xdc/0x1d4 create_or_delete_synth_event+0x74/0x204 trace_parse_run_command+0x2bc/0x4b8 synth_events_write+0x20/0x30 vfs_write+0x200/0x830 ...

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Linux kernel 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	27c888da9867725784bad3d6455d6e53b425fa2b ~ 9fe183f659a2704255e5d84f6ae308c234a113ec	-
Linux	Linux	5.18	-

II. Public POCs for CVE-2023-53478

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2023-53478

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https://www.cve.org/CVERecord?id=CVE-2023-53478

Same Patch Batch · Linux · 2025-10-01 · 169 CVEs total

CVE-2023-53517	9.8 CRITICAL	tipc: do not update mtu if msg_max is too small in mtu negotiation
CVE-2023-53454	8.8 HIGH	HID: multitouch: Correct devm device reference for hidinput input_dev name
CVE-2025-39918	8.8 HIGH	wifi: mt76: fix linked list corruption
CVE-2025-39919	8.8 HIGH	wifi: mt76: mt7996: add missing check for rx wcid entries
CVE-2022-50442	8.4 HIGH	fs/ntfs3: Validate buffer length while parsing index
CVE-2023-53493	8.4 HIGH	accel/qaic: tighten bounds checking in decode_message()
CVE-2022-50421	7.8 HIGH	rpmsg: char: Avoid double destroy of default endpoint
CVE-2023-53484	7.8 HIGH	lib: cpu_rmap: Avoid use after free on rmap->obj array entries
CVE-2022-50440	7.8 HIGH	drm/vmwgfx: Validate the box size for the snooped cursor
CVE-2022-50454	7.8 HIGH	drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()
CVE-2023-53465	7.8 HIGH	soundwire: qcom: fix storing port config out-of-bounds
CVE-2025-39924	7.8 HIGH	erofs: fix invalid algorithm for encoded extents
CVE-2023-53510	7.8 HIGH	scsi: ufs: core: Fix handling of lrbp->cmd
CVE-2025-39927	7.8 HIGH	ceph: fix race condition validating r_parent before applying state
CVE-2023-53506	7.8 HIGH	udf: Do not bother merging very long extents
CVE-2022-50437	7.8 HIGH	drm/msm/hdmi: fix memory corruption with too many bridges
CVE-2023-53495	7.8 HIGH	net: ethernet: mvpp2_main: fix possible OOB write in mvpp2_ethtool_get_rxnfc()
CVE-2023-53494	7.8 HIGH	crypto: xts - Handle EBUSY correctly
CVE-2022-50432	7.8 HIGH	kernfs: fix use-after-free in __kernfs_remove
CVE-2023-53492	7.8 HIGH	netfilter: nf_tables: do not ignore genmask when looking up chain by id

Showing top 20 of 169 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux

V. Comments for CVE-2023-53478

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2023-53478— tracing/synthetic: Fix races on freeing last_cmd

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 8

I. Basic Information for CVE-2023-53478

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2023-53478

III. Intelligence Information for CVE-2023-53478

Same Patch Batch · Linux · 2025-10-01 · 169 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2023-53478

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