{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48828", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-16T11:38:08.903Z", "datePublished": "2024-07-16T11:44:12.660Z", "dateUpdated": "2026-08-05T08:52:33.198Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:33.198Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix ia_size underflow\n\niattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and\nNFSv4 both define file size as an unsigned 64-bit type. Thus there\nis a range of valid file size values an NFS client can send that is\nalready larger than Linux can handle.\n\nCurrently decode_fattr4() dumps a full u64 value into ia_size. If\nthat value happens to be larger than S64_MAX, then ia_size\nunderflows. I'm about to fix up the NFSv3 behavior as well, so let's\ncatch the underflow in the common code path: nfsd_setattr()." } ], "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:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in nfsd_setattr()/decode_fattr4 on the in-kernel NFS server; a remote NFSv4 client triggers it by sending SETATTR (or OPEN/CREATE with a size attribute) with a file size greater than S64_MAX over the network.\nAC:L - The attacker fully controls the SETATTR size field and can deterministically supply a u64 > S64_MAX; conversion to signed loff_t and the subsequent notify_change path require no race or attacker-uncontrollable conditions.\nPR:N - Typical nfsd deployments accept AUTH_SYS/AUTH_NULL on reachable exports, so a network peer can obtain a filehandle and assert a writable owner UID without verified credentials; NFSv4 size SETATTR then proceeds with a write stateid from that unauthenticated session.\nUI:N - The attacker alone mounts/looks up and issues SETATTR with an oversized size; no victim user action such as opening a crafted file is required beyond nfsd already exporting a filesystem.\nS:U - Impact is corruption of the NFS server's own kernel/filesystem state under the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - The flaw turns an oversized size into a negative ia_size and drives a destructive truncate/corruption path; it does not create an OOB/UAF read or other information-disclosure primitive.\nI:H - At the time of this bug, inode_newsize_ok() did not reject negative offsets, so notify_change applied ia_size < 0 through setattr_prepare into ext4/xfs truncate paths, writing a negative i_size/i_disksize and freeing file blocks—documented filesystem corruption.\nA:H - Corrupting inode size metadata and truncating file contents on the exported filesystem denies service for that data and can destabilize subsequent VFS/fs operations on the corrupted inode, matching High availability impact for a network-triggered server-side corruption." } ] } ], "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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d2211e6e34d0755f35e2f8c22d81999fa81cfc71", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "38d02ba22e43b6fc7d291cf724bc6e3b7be6626b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8e0ecaf7a7e57b30284d6b3289cc436100fadc48", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "da22ca1ad548429d7822011c54cfe210718e0aa7", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e6faac3f58c7c4176b66f63def17a34232a17b0e", "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": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.295", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.220", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.24", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.10", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17", "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": "2.6.12", "versionEndExcluding": "5.4.295" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.16.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d2211e6e34d0755f35e2f8c22d81999fa81cfc71" }, { "url": "https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b" }, { "url": "https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48" }, { "url": "https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7" }, { "url": "https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e" } ], "title": "NFSD: Fix ia_size underflow", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:25:01.551Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48", "tags": [ "x_transferred" ] }, { "url": 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