{"apiVersion":"1.0","identifier":"CVE-2026-80603","description":"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.","publishedAt":"2026-08-28T08:16:44","lastModifiedAt":"2026-08-28T08:16:44","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80603","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00176,"riskScore":0,"affectedProduct":"linux","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-80603","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-80603","en":"https://www.redsauce.net/en/cves/CVE-2026-80603","fr":"https://www.redsauce.net/fr/cves/CVE-2026-80603","pt":"https://www.redsauce.net/pt/cves/CVE-2026-80603","de":"https://www.redsauce.net/de/cves/CVE-2026-80603","sk":"https://www.redsauce.net/sk/cves/CVE-2026-80603","el":"https://www.redsauce.net/el/cves/CVE-2026-80603"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-80603"}}