CVE-2023-52928
published 2025-03-27CVE-2023-52928: In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc call in…
PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.24%
14.5th percentile
In the Linux kernel, the following vulnerability has been resolved:
bpf: Skip invalid kfunc call in backtrack_insn
The verifier skips invalid kfunc call in check_kfunc_call(), which
would be captured in fixup_kfunc_call() if such insn is not eliminated
by dead code elimination. However, this can lead to the following
warning in backtrack_insn(), also see [1]:
------------[ cut here ]------------
verifier backtracking bug
WARNING: CPU: 6 PID: 8646 at kernel/bpf/verifier.c:2756 backtrack_insn
kernel/bpf/verifier.c:2756
__mark_chain_precision kernel/bpf/verifier.c:3065
mark_chain_precision kernel/bpf/verifier.c:3165
adjust_reg_min_max_vals kernel/bpf/verifier.c:10715
check_alu_op kernel/bpf/verifier.c:10928
do_check kernel/bpf/verifier.c:13821 [inline]
do_check_common kernel/bpf/verifier.c:16289
[...]
So make backtracking conservative with this by returning ENOTSUPP.
[1] https://lore.kernel.org/bpf/CACkBjsaXNceR8ZjkLG=dT3P=4A8SBsg0Z5h5PWLryF5=ghKq=g@mail.gmail.com/
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.11-1 (bookworm) | linux 6.1.11-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= e6ac2450d6dee3121cd8bbf2907b78a68a8a353d < 6e2fac197de2c4c041bdd8982cffb104689113f1 | 6e2fac197de2c4c041bdd8982cffb104689113f1 |
| linux | linux | >= e6ac2450d6dee3121cd8bbf2907b78a68a8a353d < 74eec8266f37aff609db6a2f2b093e56a11c28c4 | 74eec8266f37aff609db6a2f2b093e56a11c28c4 |
| linux | linux | >= e6ac2450d6dee3121cd8bbf2907b78a68a8a353d < d3178e8a434b58678d99257c0387810a24042fb6 | d3178e8a434b58678d99257c0387810a24042fb6 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.1.11-1 | 6.1.11-1 |
| linux | linux_kernel | >= 0 < 6.1.11-1 | 6.1.11-1 |
| linux | linux_kernel | >= 0 < 6.1.11-1 | 6.1.11-1 |
| linux | linux_kernel | >= 5.13 < 5.15.93 | 5.15.93 |
| linux | linux_kernel | >= 5.16 < 6.1.11 | 6.1.11 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
CVE-2023-52928: In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc ca
osv·2025-03-27·CVSS 5.5
CVE-2023-52928 [MEDIUM] CVE-2023-52928: In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc ca
In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc call in check_kfunc_call(), which would be captured in fixup_kfunc_call() if such insn is not eliminated by dead code elimination. However, this can lead to the following warning in backtrack_insn(), also see [1]: ------------[ cut here ]------------ verifier backtracking bug WARNING: CPU: 6 PID: 8646 at kernel/bpf/verifier.c:2756 backtrack_insn kernel/bpf/verifier.c:2756 __mark_chain_precision kernel/bpf/verifier.c:3065 mark_chain_precision kernel/bpf/verifier.c:3165 adjust_reg_min_max_vals kernel/bpf/verifier.c:10715 check_alu_op kernel/bpf/verifier.c:10928 do_check kernel/bpf/verifier.c:13821 [inline] do_check_common kernel/bpf/verifier.c:16
GHSA
GHSA-qxq7-jc88-2fr4: In the Linux kernel, the following vulnerability has been resolved:
bpf: Skip invalid kfunc call in backtrack_insn
The verifier skips invalid kfunc
ghsa_unreviewed·2025-03-27
CVE-2023-52928 [MEDIUM] GHSA-qxq7-jc88-2fr4: In the Linux kernel, the following vulnerability has been resolved:
bpf: Skip invalid kfunc call in backtrack_insn
The verifier skips invalid kfunc
In the Linux kernel, the following vulnerability has been resolved:
bpf: Skip invalid kfunc call in backtrack_insn
The verifier skips invalid kfunc call in check_kfunc_call(), which
would be captured in fixup_kfunc_call() if such insn is not eliminated
by dead code elimination. However, this can lead to the following
warning in backtrack_insn(), also see [1]:
------------[ cut here ]------------
verifier backtracking bug
WARNING: CPU: 6 PID: 8646 at kernel/bpf/verifier.c:2756 backtrack_insn
kernel/bpf/verifier.c:2756
__mark_chain_precision kernel/bpf/verifier.c:3065
mark_chain_precision kernel/bpf/verifier.c:3165
adjust_reg_min_max_vals kernel/bpf/verifier.c:10715
check_alu_op kernel/bpf/verifier.c:10928
do_check kernel/bpf/verifier.c:13821 [inline]
do_check_common kernel/bpf/verifier.c
Red Hat
kernel: bpf: Skip invalid kfunc call in backtrack_insn
vendor_redhat·2025-03-27·CVSS 5.5
CVE-2023-52928 [MEDIUM] CWE-665 kernel: bpf: Skip invalid kfunc call in backtrack_insn
kernel: bpf: Skip invalid kfunc call in backtrack_insn
In the Linux kernel, the following vulnerability has been resolved:
bpf: Skip invalid kfunc call in backtrack_insn
The verifier skips invalid kfunc call in check_kfunc_call(), which
would be captured in fixup_kfunc_call() if such insn is not eliminated
by dead code elimination. However, this can lead to the following
warning in backtrack_insn(), also see [1]:
------------[ cut here ]------------
verifier backtracking bug
WARNING: CPU: 6 PID: 8646 at kernel/bpf/verifier.c:2756 backtrack_insn
kernel/bpf/verifier.c:2756
__mark_chain_precision kernel/bpf/verifier.c:3065
mark_chain_precision kernel/bpf/verifier.c:3165
adjust_reg_min_max_vals kernel/bpf/verifier.c:10715
check_alu_op kernel/bpf/verifier.c:10928
do_check kernel/bpf/verifier.c
Debian
CVE-2023-52928: linux - In the Linux kernel, the following vulnerability has been resolved: bpf: Skip i...
vendor_debian·2023·CVSS 5.5
CVE-2023-52928 [MEDIUM] CVE-2023-52928: linux - In the Linux kernel, the following vulnerability has been resolved: bpf: Skip i...
In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc call in check_kfunc_call(), which would be captured in fixup_kfunc_call() if such insn is not eliminated by dead code elimination. However, this can lead to the following warning in backtrack_insn(), also see [1]: ------------[ cut here ]------------ verifier backtracking bug WARNING: CPU: 6 PID: 8646 at kernel/bpf/verifier.c:2756 backtrack_insn kernel/bpf/verifier.c:2756 __mark_chain_precision kernel/bpf/verifier.c:3065 mark_chain_precision kernel/bpf/verifier.c:3165 adjust_reg_min_max_vals kernel/bpf/verifier.c:10715 check_alu_op kernel/bpf/verifier.c:10928 do_check kernel/bpf/verifier.c:13821 [inline] do_check_common kernel/bpf/verifier.c:16
No detection rules found.
No public exploits indexed.
2025-03-27
Published