{"id":"CVE-2026-31402","summary":"nfsd: fix heap overflow in NFSv4.0 LOCK replay cache","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix heap overflow in NFSv4.0 LOCK replay cache\n\nThe NFSv4.0 replay cache uses a fixed 112-byte inline buffer\n(rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses.\nThis size was calculated based on OPEN responses and does not account\nfor LOCK denied responses, which include the conflicting lock owner as\na variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT).\n\nWhen a LOCK operation is denied due to a conflict with an existing lock\nthat has a large owner, nfsd4_encode_operation() copies the full encoded\nresponse into the undersized replay buffer via read_bytes_from_xdr_buf()\nwith no bounds check. This results in a slab-out-of-bounds write of up\nto 944 bytes past the end of the buffer, corrupting adjacent heap memory.\n\nThis can be triggered remotely by an unauthenticated attacker with two\ncooperating NFSv4.0 clients: one sets a lock with a large owner string,\nthen the other requests a conflicting lock to provoke the denial.\n\nWe could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full\nopaque, but that would increase the size of every stateowner, when most\nlockowners are not that large.\n\nInstead, fix this by checking the encoded response length against\nNFSD4_REPLAY_ISIZE before copying into the replay buffer. If the\nresponse is too large, set rp_buflen to 0 to skip caching the replay\npayload. The status is still cached, and the client already received the\ncorrect response on the original request.","modified":"2026-07-10T03:54:00.104237460Z","published":"2026-04-03T15:16:05.724Z","related":["ALSA-2026:13565","ALSA-2026:13566","ALSA-2026:13577","ALSA-2026:13578","ALSA-2026:19568","ALSA-2026:19569","SUSE-SU-2026:2068-1","SUSE-SU-2026:2111-1","SUSE-SU-2026:21834-1","SUSE-SU-2026:21841-1","SUSE-SU-2026:21845-1","SUSE-SU-2026:21860-1","SUSE-SU-2026:21876-1","SUSE-SU-2026:21877-1","SUSE-SU-2026:21916-1","SUSE-SU-2026:21919-1","SUSE-SU-2026:2195-1","SUSE-SU-2026:2202-1","SUSE-SU-2026:2215-1","SUSE-SU-2026:2216-1","SUSE-SU-2026:2217-1","SUSE-SU-2026:22276-1","SUSE-SU-2026:22277-1","SUSE-SU-2026:22278-1","SUSE-SU-2026:22279-1","SUSE-SU-2026:22280-1","SUSE-SU-2026:22281-1","SUSE-SU-2026:22282-1","SUSE-SU-2026:22283-1","SUSE-SU-2026:22288-1","SUSE-SU-2026:2238-1","SUSE-SU-2026:22383-1","SUSE-SU-2026:22384-1","SUSE-SU-2026:22385-1","SUSE-SU-2026:22386-1","SUSE-SU-2026:22387-1","SUSE-SU-2026:22388-1","SUSE-SU-2026:22389-1","SUSE-SU-2026:22390-1","SUSE-SU-2026:22391-1","SUSE-SU-2026:22396-1","SUSE-SU-2026:22397-1","SUSE-SU-2026:22398-1","SUSE-SU-2026:22399-1","SUSE-SU-2026:22400-1","SUSE-SU-2026:22401-1","SUSE-SU-2026:22402-1","SUSE-SU-2026:22403-1","SUSE-SU-2026:22404-1","SUSE-SU-2026:22405-1","SUSE-SU-2026:22406-1","SUSE-SU-2026:22407-1","SUSE-SU-2026:22408-1","SUSE-SU-2026:22409-1","SUSE-SU-2026:22410-1","SUSE-SU-2026:22411-1","SUSE-SU-2026:22412-1","SUSE-SU-2026:22413-1","SUSE-SU-2026:22414-1","SUSE-SU-2026:22415-1","SUSE-SU-2026:22416-1","SUSE-SU-2026:22417-1","SUSE-SU-2026:22418-1","SUSE-SU-2026:22419-1","SUSE-SU-2026:22420-1","SUSE-SU-2026:22421-1","SUSE-SU-2026:22425-1","SUSE-SU-2026:22426-1","SUSE-SU-2026:22427-1","SUSE-SU-2026:22428-1","SUSE-SU-2026:22461-1","SUSE-SU-2026:22462-1","SUSE-SU-2026:22463-1","SUSE-SU-2026:22464-1","SUSE-SU-2026:22465-1","SUSE-SU-2026:22466-1","SUSE-SU-2026:22467-1","SUSE-SU-2026:22468-1","SUSE-SU-2026:22469-1","SUSE-SU-2026:22470-1","SUSE-SU-2026:22471-1","SUSE-SU-2026:22472-1","SUSE-SU-2026:22473-1","SUSE-SU-2026:22474-1","SUSE-SU-2026:22475-1","SUSE-SU-2026:22476-1","SUSE-SU-2026:22478-1","SUSE-SU-2026:22479-1","SUSE-SU-2026:22480-1","SUSE-SU-2026:22481-1","SUSE-SU-2026:22482-1","SUSE-SU-2026:22483-1","SUSE-SU-2026:22484-1","SUSE-SU-2026:22485-1","SUSE-SU-2026:22486-1","SUSE-SU-2026:22487-1","SUSE-SU-2026:22488-1","SUSE-SU-2026:22489-1","SUSE-SU-2026:22490-1","SUSE-SU-2026:22491-1","SUSE-SU-2026:22507-1","SUSE-SU-2026:22508-1","SUSE-SU-2026:22509-1","SUSE-SU-2026:2317-1","SUSE-SU-2026:2494-1","SUSE-SU-2026:2496-1","SUSE-SU-2026:2500-1","SUSE-SU-2026:2503-1","SUSE-SU-2026:2511-1","SUSE-SU-2026:2518-1","SUSE-SU-2026:2520-1","SUSE-SU-2026:2532-1","SUSE-SU-2026:2549-1","SUSE-SU-2026:2559-1","SUSE-SU-2026:2567-1","SUSE-SU-2026:2571-1","SUSE-SU-2026:2588-1","SUSE-SU-2026:2592-1","SUSE-SU-2026:2594-1","SUSE-SU-2026:2601-1","SUSE-SU-2026:2603-1","SUSE-SU-2026:2607-1","SUSE-SU-2026:2608-1","SUSE-SU-2026:2610-1","openSUSE-SU-2026:20826-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31402.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f0e2a54a31a7f9ad2915db99156114872317388"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2665887a69437a8a4f552f69509eecfb73d4aa19"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5133b61aaf437e5f25b1b396b14242a6bb0508e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8afb437ea1f70cacb4bbdf11771fb5c4d720b965"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ae8498337dfdfda71bdd0b807c9a23a126011d76"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9452c0797c95cf2378170df96cf4f4b3bca7eff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dad0c3c0a8e5d1d6eb0fc455694ce3e25e6c57d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9fcb4441f6c02bb20c2eb340101e27dfe23607c"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31402.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10108"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11313"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13565"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13566"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13577"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13578"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13664"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13681"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13734"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13936"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14137"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14165"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14301"},{"type":"ADVISORY","url":"https://acce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