{"id":"CVE-2023-53083","summary":"nfsd: don't replace page in rq_pages if it's a continuation of last page","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: don't replace page in rq_pages if it's a continuation of last page\n\nThe splice read calls nfsd_splice_actor to put the pages containing file\ndata into the svc_rqst-\u003erq_pages array. It's possible however to get a\nsplice result that only has a partial page at the end, if (e.g.) the\nfilesystem hands back a short read that doesn't cover the whole page.\n\nnfsd_splice_actor will plop the partial page into its rq_pages array and\nreturn. Then later, when nfsd_splice_actor is called again, the\nremainder of the page may end up being filled out. At this point,\nnfsd_splice_actor will put the page into the array _again_ corrupting\nthe reply. If this is done enough times, rq_next_page will overrun the\narray and corrupt the trailing fields -- the rq_respages and\nrq_next_page pointers themselves.\n\nIf we've already added the page to the array in the last pass, don't add\nit to the array a second time when dealing with a splice continuation.\nThis was originally handled properly in nfsd_splice_actor, but commit\n91e23b1c3982 (\"NFSD: Clean up nfsd_splice_actor()\") removed the check\nfor it.","modified":"2026-04-02T09:43:38.642425Z","published":"2025-05-02T15:55:31.699Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53083.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0101067f376eb7b9afd00279270f25d5111a091d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/12eca509234acb6b666802edf77408bb70d7bfca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/27c934dd8832dd40fd34776f916dc201e18b319b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51ddb84baff6f09ad62b5999ece3ec172e4e3568"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8235cd619db6e67f1d7d26c55f1f3e4e575c947d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53083.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53083"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361"},{"fixed":"8235cd619db6e67f1d7d26c55f1f3e4e575c947d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"56bc7e3821e847a6cc8027ddaba32e9a440225a5"},{"fixed":"12eca509234acb6b666802edf77408bb70d7bfca"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"91e23b1c39820bfed642119ff6b6ef9f43cf09ce"},{"fixed":"51ddb84baff6f09ad62b5999ece3ec172e4e3568"},{"fixed":"0101067f376eb7b9afd00279270f25d5111a091d"},{"fixed":"27c934dd8832dd40fd34776f916dc201e18b319b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53083.json"}}],"schema_version":"1.7.5"}