CVE-2023-53221 (GCVE-0-2023-53221)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-01-14 17:52
VLAI?
Title
bpf: Fix memleak due to fentry attach failure
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix memleak due to fentry attach failure If it fails to attach fentry, the allocated bpf trampoline image will be left in the system. That can be verified by checking /proc/kallsyms. This meamleak can be verified by a simple bpf program as follows: SEC("fentry/trap_init") int fentry_run() { return 0; } It will fail to attach trap_init because this function is freed after kernel init, and then we can find the trampoline image is left in the system by checking /proc/kallsyms. $ tail /proc/kallsyms ffffffffc0613000 t bpf_trampoline_6442453466_1 [bpf] ffffffffc06c3000 t bpf_trampoline_6442453466_1 [bpf] $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep "FUNC 'trap_init'" [2522] FUNC 'trap_init' type_id=119 linkage=static $ echo $((6442453466 & 0x7fffffff)) 2522 Note that there are two left bpf trampoline images, that is because the libbpf will fallback to raw tracepoint if -EINVAL is returned.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < 20109ddd5bea2c24d790debf5d02584ef24c3f5e (git)
Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < f72c67d1a82dada7d6d504c806e111e913721a30 (git)
Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < 6aa27775db63ba8c7c73891c7dfb71ddc230c48d (git)
Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < 108598c39eefbedc9882273ac0df96127a629220 (git)
Affected: e21d2b92354b3cd25dd774ebb0f0e52ff04a7861 (git)
Affected: 85d177f56e5256e14b74a65940f981f6e3e8bb32 (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.3.13 , ≤ 6.3.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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