Answer in brief
CVE-2026-80603 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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 28, 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.