{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53083", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-02T15:51:43.550Z", "datePublished": "2025-05-02T15:55:31.699Z", "dateUpdated": "2026-08-05T09:12:39.153Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:39.153Z" }, "descriptions": [ { "lang": "en", "value": "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->rq_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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in nfsd_splice_actor on the NFSv2/v3/v4 READ splice path, reached by sending NFS READ RPCs to the in-kernel NFS server over TCP/UDP port 2049 from a remote client; no local access is required.\nAC:L - A remote client fully controls READ offsets/lengths and can retry at will; real-world Android/Kodi clients reliably triggered the partial-page splice continuation that causes the duplicate insert and array overrun, with no race outside attacker influence.\nPR:N - Under typical AUTH_SYS/AUTH_UNIX exports the client self-asserts uid/gid with no cryptographic secret; any host permitted by the export list can LOOKUP/OPEN and issue READ with no server-verified privileges.\nUI:N - The attacking NFS client issues the READ requests itself; no action by any administrator or other user on the server is required.\nS:U - The overrun corrupts fields inside the server's svc_rqst within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The OOB write corrupts rq_respages/rq_next_page and was observed to drive page/folio refcount underflow, creating a UAF-class primitive over page-cache objects that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Unbounded svc_rqst_replace_page writes of page pointers past rq_pages overwrite adjacent kernel pointers and skew page refcounts, yielding an out-of-bounds write / UAF write primitive exploitable for control-flow hijack.\nA:H - Production reports show repeatable nfsd kthread GPFs in release_pages and VM_BUG_ON folio refcount underflow during splice READ cleanup, crashing or freezing the NFS server and requiring reboot." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfsd/vfs.c" ], "versions": [ { "version": "bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361", "lessThan": "8235cd619db6e67f1d7d26c55f1f3e4e575c947d", "status": "affected", "versionType": "git" }, { "version": "56bc7e3821e847a6cc8027ddaba32e9a440225a5", "lessThan": "12eca509234acb6b666802edf77408bb70d7bfca", "status": "affected", "versionType": "git" }, { "version": "91e23b1c39820bfed642119ff6b6ef9f43cf09ce", "lessThan": "51ddb84baff6f09ad62b5999ece3ec172e4e3568", "status": "affected", "versionType": "git" }, { "version": "91e23b1c39820bfed642119ff6b6ef9f43cf09ce", "lessThan": "0101067f376eb7b9afd00279270f25d5111a091d", "status": "affected", "versionType": "git" }, { "version": "91e23b1c39820bfed642119ff6b6ef9f43cf09ce", "lessThan": "27c934dd8832dd40fd34776f916dc201e18b319b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfsd/vfs.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.22", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.9", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.22" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8235cd619db6e67f1d7d26c55f1f3e4e575c947d" }, { "url": "https://git.kernel.org/stable/c/12eca509234acb6b666802edf77408bb70d7bfca" }, { "url": "https://git.kernel.org/stable/c/51ddb84baff6f09ad62b5999ece3ec172e4e3568" }, { "url": "https://git.kernel.org/stable/c/0101067f376eb7b9afd00279270f25d5111a091d" }, { "url": "https://git.kernel.org/stable/c/27c934dd8832dd40fd34776f916dc201e18b319b" } ], "title": "nfsd: don't replace page in rq_pages if it's a continuation of last page", "x_generator": { "engine": "bippy-1.2.0" } } } }