High 7.8Published Oct 4, 2025

CVE-2023-53557fprobe: Release rethook after the ftrace_ops is unregistered

Updated under an hour ago (2026-10-19 08:00 UTC)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: fprobe: Release rethook after the ftrace_ops is unregistered While running bpf selftests it's possible to get following fault: general protection fault, probably for non-canonical address \ 0x6b6b6b6b6b6b6b6b: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC NOPTI ... Call Trace: <TASK> fprobe_handler+0xc1/0x270 ? __pfx_bpf_testmod_init+0x10/0x10 ? __pfx_bpf_testmod_init+0x10/0x10 ? bpf_fentry_test1+0x5/0x10 ? bpf_fentry_test1+0x5/0x10 ? bpf_testmod_init+0x22/0x80 ? do_one_initcall+0x63/0x2e0 ? rcu_is_watching+0xd/0x40 ? kmalloc_trace+0xaf/0xc0 ? do_init_module+0x60/0x250 ? __do_sys_finit_module+0xac/0x120 ? do_syscall_64+0x37/0x90 ? entry_SYSCALL_64_after_hwframe+0x72/0xdc </TASK> In unregister_fprobe function we can't release fp->rethook while it's possible there are some of its users still running on another cpu. Moving rethook_free call after fp->ops is unregistered with unregister_ftrace_function call.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5b0ab78998e32564a011b14c4c7f9c81e2d42b9d before ce3ec57faff559ccae1e0150c1f077eb2df648a4; 5b0ab78998e32564a011b14c4c7f9c81e2d42b9d builds before 03d63255a5783243c110aec5e6ae2f1475c3be76; from 5b0ab78998e32564a011b14c4c7f9c81e2d42b9d before 5f81018753dfd4989e33ece1f0cb6b8aae498b82	CNA record
linux linux_kernel linux:linux_kernel	from 5.18 before 6.1.40; from 6.2 before 6.4.5; 6.5	NVD

References

https://git.kernel.org/stable/c/ce3ec57faff559ccae1e0150c1f077eb2df648a4patch
https://git.kernel.org/stable/c/03d63255a5783243c110aec5e6ae2f1475c3be76patch
https://git.kernel.org/stable/c/5f81018753dfd4989e33ece1f0cb6b8aae498b82patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.