{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64160", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.038Z", "datePublished": "2026-07-19T15:40:47.063Z", "dateUpdated": "2026-08-05T12:39:50.187Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:50.187Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix potential for tearing in ->remote_i_size and ->zero_point\n\nFix potential tearing in using ->remote_i_size and ->zero_point by copying\ni_size_read() and i_size_write() and using the same seqcount as for i_size.\n\nWe need to make sure that netfslib and the filesystems that use it always\nhold i_lock whilst updating any of the sizes to prevent i_size_seqcount\nfrom getting corrupted." } ], "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 netfs client code (CIFS/SMB, AFS, 9p) reached when processing network filesystem protocol responses and concurrent I/O; a malicious remote server can drive attribute/size updates that race with client read/write paths.\nAC:L - The attacker controls both sides of the race by timing SMB/AFS/9p responses against concurrent local read/write/DIO operations, or by spawning parallel threads performing file I/O on the same inode.\nPR:N - A remote malicious filesystem server needs no privileges on the victim host; exploitation only requires the victim system to perform routine I/O against a mounted attacker-controlled or MITM'd network share.\nUI:N - No per-attack discretionary user action is required beyond an existing CIFS/AFS/9p mount and normal automated or concurrent file access, which is typical in enterprise and embedded deployments.\nS:U - Impact is confined to the victim kernel's netfs client subsystem and does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Torn 64-bit size values produce attacker-influenceable arbitrary bounds used in read-length and EOF decisions, potentially causing out-of-bounds kernel reads or stale-cache data exposure beyond intended file ranges.\nI:H - Corrupted size metadata causes incorrect zero-filling, skipped server reads, and wrong EOF handling, enabling arbitrary modification of file content visible to applications and incorrect size metadata written back to the server.\nA:H - Unsynchronized writes can corrupt i_size_seqcount, causing i_size_read() and related readers to spin forever, producing soft lockups and denial of service for affected inodes and dependent processes." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/9p/v9fs_vfs.h", "fs/9p/vfs_inode.c", "fs/9p/vfs_inode_dotl.c", "fs/afs/file.c", "fs/afs/inode.c", "fs/afs/internal.h", "fs/afs/write.c", "fs/netfs/buffered_read.c", "fs/netfs/buffered_write.c", "fs/netfs/direct_write.c", "fs/netfs/misc.c", "fs/netfs/write_collect.c", "fs/smb/client/cifsfs.c", "fs/smb/client/cifssmb.c", "fs/smb/client/file.c", "fs/smb/client/inode.c", "fs/smb/client/readdir.c", "fs/smb/client/smb2ops.c", "fs/smb/client/smb2pdu.c", "include/linux/netfs.h" ], "versions": [ { "version": "4058f742105ecfcbdf99e1139e6c1f74fb8e6db9", "lessThan": "55970f238d495517edc961d55c44c772594d0969", "status": "affected", "versionType": "git" }, { "version": "4058f742105ecfcbdf99e1139e6c1f74fb8e6db9", "lessThan": "2c8f4742bb76117d735f92a3932d85239b16c494", "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/9p/v9fs_vfs.h", "fs/9p/vfs_inode.c", "fs/9p/vfs_inode_dotl.c", "fs/afs/file.c", "fs/afs/inode.c", "fs/afs/internal.h", "fs/afs/write.c", "fs/netfs/buffered_read.c", "fs/netfs/buffered_write.c", "fs/netfs/direct_write.c", "fs/netfs/misc.c", "fs/netfs/write_collect.c", "fs/smb/client/cifsfs.c", "fs/smb/client/cifssmb.c", "fs/smb/client/file.c", "fs/smb/client/inode.c", "fs/smb/client/readdir.c", "fs/smb/client/smb2ops.c", "fs/smb/client/smb2pdu.c", "include/linux/netfs.h" ], "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.18", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/55970f238d495517edc961d55c44c772594d0969" }, { "url": "https://git.kernel.org/stable/c/2c8f4742bb76117d735f92a3932d85239b16c494" } ], "title": "netfs: Fix potential for tearing in ->remote_i_size and ->zero_point", "x_generator": { "engine": "bippy-1.2.0" } } } }