{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53360", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:54:09.733Z", "datePublished": "2025-09-17T14:56:50.287Z", "dateUpdated": "2026-08-05T09:13:39.775Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:13:39.775Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: Rework scratch handling for READ_PLUS (again)\n\nI found that the read code might send multiple requests using the same\nnfs_pgio_header, but nfs4_proc_read_setup() is only called once. This is\nhow we ended up occasionally double-freeing the scratch buffer, but also\nmeans we set a NULL pointer but non-zero length to the xdr scratch\nbuffer. This results in an oops the first time decoding needs to copy\nsomething to scratch, which frequently happens when decoding READ_PLUS\nhole segments.\n\nI fix this by moving scratch handling into the pageio read code. I\nprovide a function to allocate scratch space for decoding read replies,\nand free the scratch buffer when the nfs_pgio_header is freed." } ], "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 - This is NFS client reply decoding (fs/nfs READ_PLUS): a malicious/compromised NFSv4.2 server or on-path AUTH_SYS attacker drives short reads and resends so the same nfs_pgio_header is reused after scratch is freed, then supplies READ_PLUS XDR that hits xdr_copy_to_scratch over the network.\nAC:L - The server fully controls short-read counts, READ_PLUS hole/data segment layout, and ENOTSUPP/stateid/sequence restarts that force rpc_restart_call_prepare without re-running nfs4_proc_read_setup; CONFIG_NFS_V4_2_READ_PLUS defaults to y, so no condition is outside attacker influence.\nPR:N - Exploitation is from the remote NFS server (or MITM) with no credentials or account on the victim client; decoding runs in the client's normal READ_PLUS completion path.\nUI:N - An existing NFSv4.2 mount plus routine/background read I/O is enough; the malicious server can wait for ordinary client reads without inducing a distinct victim action at exploit time.\nS:U - The double-free/UAF and resulting corruption stay in the NFS client's kernel address space within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Before the pointer was nulled, the resend path left a dangling scratch pointer so the next READ_PLUS decode memcpy'd into freed heap (UAF write/read of reclaimed slab); double-free/UAF enables arbitrary kernel disclosure per kernel guidance.\nI:H - The same resend path double-frees the kmalloc scratch (CWE-415) and, while the dangling pointer remains, writes attacker-shaped XDR fragments into reclaimed heap via xdr_copy_to_scratch — a heap corruption primitive suitable for control-flow hijack.\nA:H - After free-and-NULL, the next decode sets a NULL scratch with non-zero length and oopses on the first xdr_copy_to_scratch (common for READ_PLUS hole segments); double-free also reliably crashes or corrupts the client and is repeatable by the remote server." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/internal.h", "fs/nfs/nfs42.h", "fs/nfs/nfs42xdr.c", "fs/nfs/nfs4proc.c", "fs/nfs/read.c" ], "versions": [ { "version": "886959f425b6a936a30b82a297ae3aecb3b8230f", "lessThan": "adac9f0ddd2b291c7ce41f549fdb27a13616cff5", "status": "affected", "versionType": "git" }, { "version": "fbd2a05f29a95d5b42b294bf47e55a711424965b", "lessThan": "a2f4cb206bd94b3f4a7bb05fcdce9525283b5681", "status": "affected", "versionType": "git" }, { "version": "fbd2a05f29a95d5b42b294bf47e55a711424965b", "lessThan": "ae5d5672f1db711e91db6f52df5cb16ecd8f5692", "status": "affected", "versionType": "git" }, { "version": "fbd2a05f29a95d5b42b294bf47e55a711424965b", "lessThan": "303a78052091c81e9003915c521fdca1c7e117af", "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/internal.h", "fs/nfs/nfs42.h", "fs/nfs/nfs42xdr.c", "fs/nfs/nfs4proc.c", "fs/nfs/read.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.16", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.3", "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": "6.4", "versionEndExcluding": "6.4.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.5.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5" }, { "url": "https://git.kernel.org/stable/c/a2f4cb206bd94b3f4a7bb05fcdce9525283b5681" }, { "url": "https://git.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692" }, { "url": "https://git.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af" } ], "title": "NFSv4.2: Rework scratch handling for READ_PLUS (again)", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53360", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:43:57.674879Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:53:00.565Z" } } ] } }