CVE-2023-52928

MEDIUM EPSS 13.6%
Published Mar 27, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Mar 27, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

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/

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
13.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.13  –  <5.15.93
linuxlinux_kernel*≥5.16  –  <6.1.11
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/6e2fac197de2c4c041bdd8982cffb104689113f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/74eec8266f37aff609db6a2f2b093e56a11c28c4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d3178e8a434b58678d99257c0387810a24042fb6
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/6e2fac197de2c4c041bdd8982cffb104689113f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/74eec8266f37aff609db6a2f2b093e56a11c28c4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d3178e8a434b58678d99257c0387810a24042fb6
    Patch