{"id":"CVE-2026-98573","state":"PUBLISHED","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.","publishedAt":"2026-10-18T15:18:38.914Z","updatedAt":"2026-10-19T09:21:58.681Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"9c4e432132a97b82edf28fa172c39f743e6bfb26","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"718747afa5463d9cc5fd9a09f03b2a492edd9b78","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"a0ad0473c09d2e947aecac5c82e637ec85924b12","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"b2da5ed3d8c75e1b729a21b6d3beaed415e263f6","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"d7f474226809471dc7877435e9c492cc914df0bf","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"3b4e0b0c008a8c1b474730248cd5b873026c74bd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98573.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98573","state":"PUBLISHED","datePublished":"2026-10-18T15:18:38.914Z","dateUpdated":"2026-10-19T09:21:58.681Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.358Z"},"containers":{"cna":{"title":"net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"9c4e432132a97b82edf28fa172c39f743e6bfb26","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"718747afa5463d9cc5fd9a09f03b2a492edd9b78","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"a0ad0473c09d2e947aecac5c82e637ec85924b12","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"b2da5ed3d8c75e1b729a21b6d3beaed415e263f6","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"d7f474226809471dc7877435e9c492cc914df0bf","versionType":"git"},{"version":"1431fb31ecbaba1b5718006128f0f2ed0b94e1c3","status":"affected","lessThan":"3b4e0b0c008a8c1b474730248cd5b873026c74bd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26"},{"url":"https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78"},{"url":"https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12"},{"url":"https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6"},{"url":"https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b"},{"url":"https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962"},{"url":"https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf"},{"url":"https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:21:58.681Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}