{"id":"CVE-2026-98573","summary":"net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()\n\nskb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max\nargument and passes the result to __pskb_pull_tail() as a signed int.  The\nfunction does not ensure that max is at least skb_headlen(skb).\n\nThis can happen while parsing IPv6 extension headers when an skb already\nhas a linear area larger than MAX_IPV6_HDR_LEN.  Once the parser needs data\nbeyond the linear area, max - skb_headlen(skb) wraps and is converted to a\nnegative delta.  __pskb_pull_tail() then passes that negative length to\nskb_copy_bits(), where it can become a very large copy length.\n\nPass the requested length itself as the pull bound at the three\nextension-header call sites, so the delta can no longer go negative.","modified":"2026-10-19T02:46:45.185625377Z","published":"2026-10-18T15:18:38.914Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98573.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98573.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98573"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3"},{"fixed":"9c4e432132a97b82edf28fa172c39f743e6bfb26"},{"fixed":"718747afa5463d9cc5fd9a09f03b2a492edd9b78"},{"fixed":"a0ad0473c09d2e947aecac5c82e637ec85924b12"},{"fixed":"b2da5ed3d8c75e1b729a21b6d3beaed415e263f6"},{"fixed":"6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b"},{"fixed":"cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962"},{"fixed":"d7f474226809471dc7877435e9c492cc914df0bf"},{"fixed":"3b4e0b0c008a8c1b474730248cd5b873026c74bd"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98573.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.13.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98573.json"}}],"schema_version":"1.9.0"}