bpf: Reject %p% format string in bprintf-like helpers
Summary
| CVE | CVE-2025-38528 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-08-16 12:15:28 UTC |
| Updated | 2026-07-30 06:23:24 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: bpf: Reject %p% format string in bprintf-like helpers static const char fmt[] = "%p%"; bpf_trace_printk(fmt, sizeof(fmt)); The above BPF program isn't rejected and causes a kernel warning at runtime: Please remove unsupported %\x00 in format string WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0 This happens because bpf_bprintf_prepare skips over the second %, detected as punctuation, while processing %p. This patch fixes it by not skipping over punctuation. %\x00 is then processed in the next iteration and rejected. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Problem Types: NVD-CWE-noinfo
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 97303e541e12f1fea97834ec64b98991e8775f39 git | Not specified |
| CNA | Linux | Linux | affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 git | Not specified |
| CNA | Linux | Linux | affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 e7be679124bae8cf4fa6e40d7e1661baddfb3289 git | Not specified |
| CNA | Linux | Linux | affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 6952aeace93f8c9ea01849efecac24dd3152c9c9 git | Not specified |
| CNA | Linux | Linux | affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8 git | Not specified |
| CNA | Linux | Linux | affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 f8242745871f81a3ac37f9f51853d12854fd0b58 git | Not specified |
| CNA | Linux | Linux | affected 5.13 | Not specified |
| CNA | Linux | Linux | unaffected 5.13 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.190 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.147 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.100 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.40 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.15.8 6.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.16 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| lists.debian.org/debian-lts-announce/2025/10/msg00008.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Mailing List, Third Party Advisory |
| git.kernel.org/stable/c/97303e541e12f1fea97834ec64b98991e8775f39 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/6952aeace93f8c9ea01849efecac24dd3152c9c9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/e7be679124bae8cf4fa6e40d7e1661baddfb3289 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/1c5f5fd47bbda17cb885fe6f03730702cd53d3f8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/f8242745871f81a3ac37f9f51853d12854fd0b58 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/61d5fa45ed13e42af14c7e959baba9908b8ee6d4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.