bpf: Reject %p% format string in bprintf-like helpers
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.8
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 48cac3f4a96ddf08df8e53809ed066de0dc93915 · fixed in 97303e541e12f1fea97834ec64b98991e8775f39; From 48cac3f4a96ddf08df8e53809ed066de0dc93915 · fixed in 61d5fa45ed13e42af14c7e959baba9908b8ee6d4; From 48cac3f4a96ddf08df8e53809ed066de0dc93915 · fixed in e7be679124bae8cf4fa6e40d7e1661baddfb3289; From 48cac3f4a96ddf08df8e53809ed066de0dc93915 · fixed in 6952aeace93f8c9ea01849efecac24dd3152c9c9; From 48cac3f4a96ddf08df8e53809ed066de0dc93915 · fixed in 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8; From 48cac3f4a96ddf08df8e53809ed066de0dc93915 · fixed in f8242745871f81a3ac37f9f51853d12854fd0b58
- Linux Linux
5.13
- KernelLinux
From 5.13.0 · fixed in 5.15.190; From 5.16.0 · fixed in 6.1.147; From 6.2.0 · fixed in 6.6.100; From 6.7.0 · fixed in 6.12.40; From 6.13.0 · fixed in 6.15.8