bpf: Reject %p% format string in bprintf-like helpers (Linux Linux)

CVE-2025-38528
HIGH 7.1

At a glance

Source
NVD
EPSS
EPSS 0.17 % · percentile 7 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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.

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HLinux
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 48cac3f4a96ddf08df8e53809ed066de0dc93915 < 97303e541e12f1fea97834ec64b98991e8775f39 ; affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 < 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 ; affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 < e7be679124bae8cf4fa6e40d7e1661baddfb3289 ; affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 < 6952aeace93f8c9ea01849efecac24dd3152c9c9 ; affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 < 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8 ; affected 48cac3f4a96ddf08df8e53809ed066de0dc93915 < f8242745871f81a3ac37f9f51853d12854fd0b58
Linux · Linuxaffected 5.13 ; unaffected 0 < 5.13 ; unaffected 5.15.190 ≤ 5.15.* ; unaffected 6.1.147 ≤ 6.1.* ; unaffected 6.6.100 ≤ 6.6.* ; unaffected 6.12.40 ≤ 6.12.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD