{"id":"CVE-2026-98573","published":"2026-10-18T16:17:09.587","lastModified":"2026-10-19T10:19:15.453","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd","tags":[]},{"url":"https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b","tags":[]},{"url":"https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78","tags":[]},{"url":"https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26","tags":[]},{"url":"https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12","tags":[]},{"url":"https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6","tags":[]},{"url":"https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962","tags":[]},{"url":"https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}