298 lines
16 KiB
JSON
298 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89672",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.746Z",
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"datePublished": "2026-09-11T19:45:57.414Z",
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"dateUpdated": "2026-10-30T12:32:37.687Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:32:37.687Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: gate nfs2 setacl by argp->mask\n\nThe NFSACL v2 SETACL path shares the decoder convention used by its\nv3 sibling: nfsaclsvc_decode_setaclargs() fills in argp->acl_access\nonly when NFS_ACL is set in the request mask and argp->acl_default\nonly when NFS_DFACL is set, leaving the other pointer NULL because\nthe argument buffer is zeroed up to pc_argzero before decode.\n\nnfsacld_proc_setacl() then hands both pointers to set_posix_acl()\nunconditionally. set_posix_acl(idmap, dentry, type, NULL) is the VFS\n\"remove this ACL type\" operation, so an omitted arm is\nindistinguishable from an explicit request to delete that ACL. A\nSETACL carrying only NFS_ACL silently strips the directory's default\nACL; mask=0 strips both.\n\nThis is the same defect just fixed in nfsd3_proc_setacl(); apply the\nsame remedy. Gate each set_posix_acl() call on its mask bit and\ninitialize error to 0 so that a request with neither bit set leaves\nthe on-disk ACLs untouched and returns success. The out_drop_lock\npath and the unconditional posix_acl_release() in\nnfsaclsvc_release_setacl() already tolerate the skipped arms."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The flaw is in nfsd NFSACL v2 SETACL (RPC program 100227, ACLPROC2_SETACL) in nfsacld_proc_setacl(); a remote NFS client reaches it over TCP/UDP 2049 via svc_process to nfsd_dispatch and nfsaclsvc_decode_setaclargs.\nAC:L - The attacker supplies the SETACL mask and filehandle. A request with only NFS_ACL, only NFS_DFACL, or mask=0 leaves the omitted posix_acl pointer NULL (pc_argzero), and set_posix_acl() treats NULL as delete with no race or uninfluencable victim state.\nPR:N - Typical AUTH_SYS nfsd exports do not cryptographically verify RPC credentials; any host allowed by the export can MOUNT/LOOKUP and send SETACL with a spoofed AUTH_UNIX owner uid so nfsd_setuser() and inode_owner_or_capable() succeed without a local account.\nUI:N - The attacking NFS client sends the SETACL RPC itself; no local user or administrator action on the NFS server, such as mounting a filesystem or opening a file, is required at attack time.\nS:U - Unintended set_posix_acl(NULL) only removes POSIX ACL xattrs on the exported filesystem of the nfsd host; impact stays in that kernel/filesystem security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Silently deleting a directory default ACL (SETACL with only NFS_ACL, or mask=0 stripping both) drops inheritance so new files are governed only by mode/umask, allowing a remote client to READ subsequently created data those default ACLs were meant to keep confidential.\nI:H - nfsacld_proc_setacl() calls set_posix_acl(..., NULL) for every ACL type omitted from the mask, which is the VFS delete operation, so an attacker-chosen inode can have its access ACL, default ACL, or both completely removed and later writes those ACLs would have denied.\nA:N - This is an unintended POSIX ACL deletion through the normal set_posix_acl(NULL) remove path; it does not oops, panic, hang, deadlock, or leak memory, so the NFS server and host remain available."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/nfsd/nfs2acl.c"
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],
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"versions": [
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "d00a2f81ba7c57045bd644971ddb6961c5efe3e0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "760e7a4f92f597c61ab6b089f934a7e3acf238b7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "54ff9c81d6b77de4540ba33a3b4d613ce3194863",
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"status": "affected",
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "8e4422b05f410f95c51b68a0db4bf1d87f6d22f5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "e41d173d9dc735cecb15ab7aa63ecab09338f81b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "f951b22dbeec46f2e0fba81cb80d1b0c686b61eb",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "37eea38e7898538f0ec5f1eb8b18d8646e4be41c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
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"lessThan": "a3a7e20ed66d3f04d37883c398da8a113b430769",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/nfsd/nfs2acl.c"
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],
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"versions": [
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{
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"version": "2.6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/d00a2f81ba7c57045bd644971ddb6961c5efe3e0"
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},
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{
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"url": "https://git.kernel.org/stable/c/760e7a4f92f597c61ab6b089f934a7e3acf238b7"
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},
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{
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"url": "https://git.kernel.org/stable/c/54ff9c81d6b77de4540ba33a3b4d613ce3194863"
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},
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{
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"url": "https://git.kernel.org/stable/c/8e4422b05f410f95c51b68a0db4bf1d87f6d22f5"
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},
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{
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"url": "https://git.kernel.org/stable/c/e41d173d9dc735cecb15ab7aa63ecab09338f81b"
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},
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{
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"url": "https://git.kernel.org/stable/c/f951b22dbeec46f2e0fba81cb80d1b0c686b61eb"
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},
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{
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"url": "https://git.kernel.org/stable/c/37eea38e7898538f0ec5f1eb8b18d8646e4be41c"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3a7e20ed66d3f04d37883c398da8a113b430769"
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}
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],
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"title": "nfsd: gate nfs2 setacl by argp->mask",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-89672",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:25:46.874632Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:48.206Z"
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}
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}
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]
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}
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} |