bpf: Reject %p% format string in bprintf-like helpers
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.
CVE-2025-38528
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38528
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "48cac3f4a96ddf08df8e53809ed066de0dc93915",
"lessThan": "97303e541e12f1fea97834ec64b98991e8775f39",
"versionType": "git"
},
{
"status": "affected",
"version": "48cac3f4a96ddf08df8e53809ed066de0dc93915",
"lessThan": "61d5fa45ed13e42af14c7e959baba9908b8ee6d4",
"versionType": "git"
},
{
"status": "affected",
"version": "48cac3f4a96ddf08df8e53809ed066de0dc93915",
"lessThan": "e7be679124bae8cf4fa6e40d7e1661baddfb3289",
"versionType": "git"
},
{
"status": "affected",
"version": "48cac3f4a96ddf08df8e53809ed066de0dc93915",
"lessThan": "6952aeace93f8c9ea01849efecac24dd3152c9c9",
"versionType": "git"
},
{
"status": "affected",
"version": "48cac3f4a96ddf08df8e53809ed066de0dc93915",
"lessThan": "1c5f5fd47bbda17cb885fe6f03730702cd53d3f8",
"versionType": "git"
},
{
"status": "affected",
"version": "48cac3f4a96ddf08df8e53809ed066de0dc93915",
"lessThan": "f8242745871f81a3ac37f9f51853d12854fd0b58",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/helpers.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.147",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.100",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.40",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.8",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/helpers.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38528
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30589 · Revision 1
- Added to Heist Feed
- Publisher date