{"id":"CVE-2026-74631","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74631","summary":"net: smc: fix splice entry lifetime imbalance in smc_rx_splice","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: smc: fix splice entry lifetime imbalance in smc_rx_splice\n\nsmc_rx_splice() passes pages to splice_to_pipe() before taking the\nreferences that cover the lifetime of each splice entry. In the\nVM-backed RMB path, splice_to_pipe() may drop unqueued entries through\nsmc_rx_spd_release(), while queued entries are released later via the\npipe buffer callback.\n\nThe old post-splice accounting also derives the number of queued VM pages\nfrom an offset mutated while building the descriptor, and a multi-page\nsplice pairs one sock_hold() with multiple sock_put() calls.\n\nTake the page and socket references for every candidate entry before\nsplice_to_pipe(), and drop the matching private state, page reference,\nand socket reference from smc_rx_spd_release() for entries that never\nget queued. This fixes a refcount imbalance that can underflow page\nrefcounts and trigger a use-after-free.","published":"2026-08-22T15:32:12.334Z","modified":"2026-08-25T03:51:40.061865815Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.266"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74631.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74631"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-25T03:51:40.061865815Z"}}