CVE-2023-53557

MEDIUM EPSS 3.0%
Published Oct 4, 20258mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 4, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

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 Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥5.18  –  <6.1.40
linuxlinux_kernel*≥6.2  –  <6.4.5
linuxlinux_kernel6.5any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/03d63255a5783243c110aec5e6ae2f1475c3be76
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5f81018753dfd4989e33ece1f0cb6b8aae498b82
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ce3ec57faff559ccae1e0150c1f077eb2df648a4
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/03d63255a5783243c110aec5e6ae2f1475c3be76
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5f81018753dfd4989e33ece1f0cb6b8aae498b82
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ce3ec57faff559ccae1e0150c1f077eb2df648a4
    Patch