Answer in brief
CVE-2026-80603 records a Critical severity (CVSS 9.1) vulnerability in netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abb8c32b88ea3f46beb68c34fe9a3ac8ed664e7e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <437e0a3854b3a44ec15afa9ab88ec215adf3a2fd || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <910c33e4a8c046c3cc1fa5a465a4d41a1bb398f1 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b70f61f569bb29acb380e6f616a1bbdee15668f || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2393f0bd7a467ad475598f3a5b9de27ca36e3037 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aff589556ed772cb1c0c2d7b4d91ec45c0c39416 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eeef3b81f449560653662df2dde6f6fe247c5365 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef6400ca25a13fd6dedbe8ef4a1d0979bbbfe88a | abb8c32b88ea3f46beb68c34fe9a3ac8ed664e7e, 437e0a3854b3a44ec15afa9ab88ec215adf3a2fd, 910c33e4a8c046c3cc1fa5a465a4d41a1bb398f1, 2b70f61f569bb29acb380e6f616a1bbdee15668f, 2393f0bd7a467ad475598f3a5b9de27ca36e3037, aff589556ed772cb1c0c2d7b4d91ec45c0c39416, eeef3b81f449560653662df2dde6f6fe247c5365, ef6400ca25a13fd6dedbe8ef4a1d0979bbbfe88a |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 28, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read parse_dcc() treats data_end as an inclusive end pointer, but its only caller passes data_limit = ib_ptr + datalen, which points one past the last valid byte. The newline search loop iterates while tmp <= data_end, so when no newline is present, *tmp is read at tmp == data_end, one byte beyond the region filled by skb_header_pointer(). irc_buffer is kmalloc'd as MAX_SEARCH_SIZE + 1 bytes and datalen is capped at MAX_SEARCH_SIZE, so the stray read does not fault. The byte is uninitialized or stale; if it contains an ASCII digit, simple_strtoul will consume it and produce a wrong DCC IP or port in the conntrack expectation. The extra allocation byte is also a fragile guard: if the cap or allocation size changes, this becomes a real out-of-bounds read. Change the loop and its post-loop check to use strict less-than, consistent with the caller's exclusive-end convention. Update the function comment accordingly.
Quoted source text, attributed separately from HOL analysis.