CVE-2026-53082
Vulnerability 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.
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.
Vulnerability Details
Published Date
Last Modified
Source
NVD
Vendor
Linux
Product
Linux
External References
- https://git.kernel.org/stable/c/1d3abf0c3ddeefc6f6d913aa129acc06fce8240a
- https://git.kernel.org/stable/c/2951656b0de00153f2687f3a093890bce72b6215
- https://git.kernel.org/stable/c/578f3aba427c938fecfa0d8c83d9acb213a9b24a
- https://git.kernel.org/stable/c/987af7625ceb1ee59d70eb0abd7af11c75e45d79
- https://git.kernel.org/stable/c/bf9a38803b2626b01cc769aaf13485d8650f576f
- https://git.kernel.org/stable/c/d4cceb5184538613572fb79319453f281b1eeacb
- https://git.kernel.org/stable/c/d9ce2a4b679122397d7f35bad7be46913ad1ca80
- https://git.kernel.org/stable/c/e9cf4018d74237d142cd66243c821d13593270f0
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