CVE-2024-53125

Published Dec 4, 2024

Last updated 6 months ago

CVSS medium 5.5

Overview

Description
In the Linux kernel, the following vulnerability has been resolved: bpf: sync_linked_regs() must preserve subreg_def Range propagation must not affect subreg_def marks, otherwise the following example is rewritten by verifier incorrectly when BPF_F_TEST_RND_HI32 flag is set: 0: call bpf_ktime_get_ns call bpf_ktime_get_ns 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff 2: w1 = w0 rewrites w1 = w0 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r) 4: r1 >>= 32 r11 <<= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: exit; if w0 < 0xa goto pc+0 r1 >>= 32 r0 = r1 exit (or zero extension of w1 at (2) is missing for architectures that require zero extension for upper register half). The following happens w/o this patch: - r0 is marked as not a subreg at (0); - w1 is marked as subreg at (2); - w1 subreg_def is overridden at (3) by copy_register_state(); - w1 is read at (5) but mark_insn_zext() does not mark (2) for zero extension, because w1 subreg_def is not set; - because of BPF_F_TEST_RND_HI32 flag verifier inserts random value for hi32 bits of (2) (marked (r)); - this random value is read at (5).
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Modified
Products
linux_kernel

Risk scores

CVSS 3.1

Type
Primary
Base score
5.5
Impact score
3.6
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity
MEDIUM

Weaknesses

nvd@nist.gov
NVD-CWE-noinfo

Social media

Hype score
Not currently trending

  1. 🚨 Critical #LinuxKernel Patches! SUSE Live Patch 38 (SLE 15 SP4 / openSUSE Leap 15.4) fixes 4 HIGH-sev vulns: ✅ CVE-2025-37797 (HFSC UAF). ✅ CVE-2024-53125 (BPF flaw). ✅ CVE-2025-21702 (pfifo). ✅ CVE-2025-37752 (SFQ). Read more:👉 https://t.co/9xiz3h2QSu https://t.c

    @Cezar_H_Linux

    4 Aug 2025

    46 Impressions

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  2. New post from https://t.co/uXvPWJy6tj (CVE-2024-53125 | Linux Kernel up to 6.11.5 sync_linked_regs random values (e2ef0f317a52/e9bd9c498cb0 / Nessus ID 214250)) has been published on https://t.co/9mRU1kgnuH

    @WolfgangSesin

    16 Jan 2025

    6 Impressions

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  3. CVE-2024-53125 In the Linux kernel, the following vulnerability has been resolved: bpf: sync_linked_regs() must preserve subreg_def Range propagation must not affect subreg_def ma… https://t.co/bPJerr1UZg

    @CVEnew

    4 Dec 2024

    215 Impressions

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Configurations

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References

Sources include official advisories and independent security research.