CVE-2026-53082
UnknownSummary
A vulnerability has been identified in the Linux kernel within the sixpack_receive_buf() function, which improperly skips bytes with TTY error flags. This leads to processing bytes that should have been skipped, resulting in an uninitialized value read.
Risk Assessment
Organizations may be exposed to security issues as processing erroneous data can lead to unpredictable system behavior and potential security vulnerabilities.
Recommendation
It is recommended to update the Linux kernel to the latest version to eliminate this vulnerability and ensure proper byte processing in the sixpack_receive_buf() function.
Original NVD description (English source)
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.