net: hamradio: 6pack: fix uninit-value in sixpack_receive_buf
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- 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
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hamradio: 6pack: fix uninit-value in sixpack_receive_buf sixpack_receive_buf() does not properly skip bytes with TTY error flags. The while loop iterates through the flags buffer but never advances the data pointer (cp), and passes the original count (including error bytes) to sixpack_decode(). This causes sixpack_decode() to process bytes that should have been skipped due to TTY errors. The TTY layer does not guarantee that cp[i] holds a meaningful value when fp[i] is set, so passing those positions to sixpack_decode() results in KMSAN reporting an uninit-value read. Fix this by processing bytes one at a time, advancing cp on each iteration, and only passing valid (non-error) bytes to sixpack_decode(). This matches the pattern used by slip_receive_buf() and mkiss_receive_buf() for the same purpose.
Timeline
- CVE published
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.12
References 8
git.kernel.org
- stable/c/1d3abf0c3ddeefc6f6d913aa129acc06fce8240a
- stable/c/d4cceb5184538613572fb79319453f281b1eeacb
- stable/c/2951656b0de00153f2687f3a093890bce72b6215
- stable/c/e9cf4018d74237d142cd66243c821d13593270f0
- stable/c/d9ce2a4b679122397d7f35bad7be46913ad1ca80
- stable/c/987af7625ceb1ee59d70eb0abd7af11c75e45d79
- stable/c/578f3aba427c938fecfa0d8c83d9acb213a9b24a
- stable/c/bf9a38803b2626b01cc769aaf13485d8650f576f