{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53711", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-22T13:21:37.346Z", "datePublished": "2025-10-22T13:23:46.458Z", "dateUpdated": "2026-08-05T09:15:39.362Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:15:39.362Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix a potential data corruption\n\nWe must ensure that the subrequests are joined back into the head before\nwe can retransmit a request. If the head was not on the commit lists,\nbecause the server wrote it synchronously, we still need to add it back\nto the retransmission list.\nAdd a call that mirrors the effect of nfs_cancel_remove_inode() for\nO_DIRECT." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L", "baseScore": 8.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug lives in the NFS client's O_DIRECT write path and is driven entirely by data from a remote peer — the server's per-WRITE `committed` level, the negotiated wsize that forces the page-group split, and the COMMIT write verifier that triggers `nfs_direct_write_reschedule()`. A malicious/compromised NFS server or an on-path attacker on unauthenticated AUTH_SYS NFS traffic reaches it over the network with no local access.\nAC:L - All three preconditions are server-controlled and can be produced deterministically and repeatedly: advertise a wsize that forces `__nfs_pageio_add_request()` to split a request into head+subrequest across two RPCs, answer one FILE_SYNC and the other UNSTABLE so only the subrequest lands on the commit list, then return a changed write verifier on COMMIT to force the reschedule.\nPR:N - The attacker is the remote NFS server (or an on-path attacker), which needs no credentials or privileges on the victim client; the vulnerable path runs in the client's normal write-completion/reschedule machinery.\nUI:N - No victim action is required beyond an already-mounted export carrying an ordinary O_DIRECT workload — the databases, VM images and backup jobs NFS O_DIRECT exists for. The reschedule runs asynchronously from `nfsiod` with no user involvement.\nS:U - The defect and its consequences are confined to the NFS client within the same kernel security authority; no VM, sandbox, or IOMMU boundary is crossed.\nC:N - Tracing the path shows no out-of-bounds read, no kernel-memory disclosure and no read primitive — subrequests hold krefs on the head and `nfs_page_group_destroy()`'s deferred teardown prevents any use-after-free. The impact is confined to what gets written back.\nI:H - Retransmitting subrequests without rejoining them to the head means an O_DIRECT write is not faithfully re-driven to stable storage after the server discards its unstable cache, so file contents silently diverge from what the application wrote while `write()` still reports success — unbounded, undetected corruption of stored data on a shared network filesystem.\nA:L - The un-joined group never collapses, so each attacker-forced reschedule round re-splits requests and grafts more members onto a page-group ring that cannot be reclaimed until the whole dreq dies, degrading memory and lengthening the O(N) ring walks while the write fails to converge. I found no reachable panic, BUG_ON, or hang, so this is degradation rather than a full availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/direct.c" ], "versions": [ { "version": "ed5d588fe47feef290f271022820e255d8371561", "lessThan": "4185605cd0f72ec8bf8b423aacd94cd5ee13bbcf", "status": "affected", "versionType": "git" }, { "version": "ed5d588fe47feef290f271022820e255d8371561", "lessThan": "da302f1d476a44245823a74546debb5d160bf5bd", "status": "affected", "versionType": "git" }, { "version": "ed5d588fe47feef290f271022820e255d8371561", "lessThan": "dac14a1dbe20e003215dacb8a3a1a7e4ca4e0ad0", "status": "affected", "versionType": "git" }, { "version": "ed5d588fe47feef290f271022820e255d8371561", "lessThan": "0ec26716e45d615edfff46012e7dedcc0ac5f7ab", "status": "affected", "versionType": "git" }, { "version": "ed5d588fe47feef290f271022820e255d8371561", "lessThan": "88975a55969e11f26fe3846bf4fbf8e7dc8cbbd4", "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/nfs/direct.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.195", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.132", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.54", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.4", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "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": "5.7", "versionEndExcluding": "5.10.195" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.132" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.5.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4185605cd0f72ec8bf8b423aacd94cd5ee13bbcf" }, { "url": "https://git.kernel.org/stable/c/da302f1d476a44245823a74546debb5d160bf5bd" }, { "url": "https://git.kernel.org/stable/c/dac14a1dbe20e003215dacb8a3a1a7e4ca4e0ad0" }, { "url": "https://git.kernel.org/stable/c/0ec26716e45d615edfff46012e7dedcc0ac5f7ab" }, { "url": "https://git.kernel.org/stable/c/88975a55969e11f26fe3846bf4fbf8e7dc8cbbd4" } ], "title": "NFS: Fix a potential data corruption", "x_generator": { "engine": "bippy-1.2.0" } } } }