CVE-2026-53082
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.
Does this matter?
Lower severity and a low EPSS score (0.11%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.11% probability · 2th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-908
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1d3abf0c3ddeefc6f6d913aa129acc06fce8240aPatch
- https://git.kernel.org/stable/c/2951656b0de00153f2687f3a093890bce72b6215Patch
- https://git.kernel.org/stable/c/578f3aba427c938fecfa0d8c83d9acb213a9b24aPatch
- https://git.kernel.org/stable/c/987af7625ceb1ee59d70eb0abd7af11c75e45d79Patch
- https://git.kernel.org/stable/c/bf9a38803b2626b01cc769aaf13485d8650f576fPatch
- https://git.kernel.org/stable/c/d4cceb5184538613572fb79319453f281b1eeacbPatch
- https://git.kernel.org/stable/c/d9ce2a4b679122397d7f35bad7be46913ad1ca80Patch
- https://git.kernel.org/stable/c/e9cf4018d74237d142cd66243c821d13593270f0Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.