{"id":"CVE-2026-98573","revision":"9722266d9b7b4f6a822d60819f9637eb","records":[{"revision":"9722266d9b7b4f6a822d60819f9637eb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98573","aliases":[],"title":"net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()","description":"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.","state":0,"publishedAt":"2026-10-18T15:18:38.914+00:00","modifiedAt":"2026-10-19T09:21:58.681+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/skbuff.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"9c4e432132a97b82edf28fa172c39f743e6bfb26\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"718747afa5463d9cc5fd9a09f03b2a492edd9b78\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"a0ad0473c09d2e947aecac5c82e637ec85924b12\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"b2da5ed3d8c75e1b729a21b6d3beaed415e263f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"d7f474226809471dc7877435e9c492cc914df0bf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3\",\n                            \"lessThan\": \"3b4e0b0c008a8c1b474730248cd5b873026c74bd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/skbuff.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26","https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78","https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12","https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6","https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b","https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962","https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf","https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98573","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98573","identifiers":["CVE-2026-98573"]},"retained":false,"historicalAffected":[]}],"coverage":[]}