CVE-2024-53125bpf: sync_linked_regs() must preserve subreg_def
- 7.8HighCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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).
Timeline
ID reserved
By Linux
- 15 days later
· 15 days later
Published
- 23 months later
· 23 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 75748837b7e56919679e02163f45d5818c644d03 – < dadf82c1b2608727bcc306843b540cd7414055a7
- affected 75748837b7e56919679e02163f45d5818c644d03 – < b57ac2d92c1f565743f6890a5b9cf317ed856b09
- affected 75748837b7e56919679e02163f45d5818c644d03 – < 60fd3538d2a8fd44c41d25088c0ece3e1fd30659
- affected 75748837b7e56919679e02163f45d5818c644d03 – < bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84
- affected 75748837b7e56919679e02163f45d5818c644d03 – < e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0
- affected 75748837b7e56919679e02163f45d5818c644d03 – < e9bd9c498cb0f5843996dbe5cbce7a1836a83c70
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.232 – ≤ 5.10.*
- unaffected 5.15.175 – ≤ 5.15.*
- unaffected 6.1.121 – ≤ 6.1.*
- unaffected 6.6.67 – ≤ 6.6.*
- unaffected 6.11.6 – ≤ 6.11.*
- unaffected 6.12 – ≤ *
References
References8
- https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7 (opens in a new tab)
- https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09 (opens in a new tab)
- https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659 (opens in a new tab)
- https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84 (opens in a new tab)
- https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0 (opens in a new tab)
- https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-51797 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-53125)Record last updated .