169 lines
9.6 KiB
JSON
169 lines
9.6 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-2026-64067",
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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": "2026-07-19T07:54:57.030Z",
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"datePublished": "2026-07-19T15:39:44.660Z",
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"dateUpdated": "2026-10-15T10:08:00.358Z"
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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": "2026-10-15T10:08:00.358Z"
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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\nnetfs: Fix missing barriers when accessing stream->subrequests locklessly\n\nThe list of subrequests attached to stream->subrequests is accessed without\nlocks by netfs_collect_read_results() and netfs_collect_write_results(),\nand then they access subreq->flags without taking a barrier after getting\nthe subreq pointer from the list. Relatedly, the functions that build the\nlist don't use any sort of write barrier when constructing the list to make\nsure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if\nno lock is taken.\n\nFix this by:\n\n (1) Add a new list_add_tail_release() function that uses a release barrier\n to set the pointer to the new member of the list.\n\n (2) Add a new list_first_entry_or_null_acquire() function that uses an\n acquire barrier to read the pointer to the first member in a list (or\n return NULL).\n\n (3) Use list_add_tail_release() when adding a subreq to ->subrequests.\n\n (4) Use list_first_entry_or_null_acquire() when initially accessing the\n front of the list (when an item is removed, the pointer to the new\n front iterm is obtained under the same lock)."
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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:H",
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"baseScore": 9.8,
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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 bug is in the netfs client library used by CIFS/SMB, Ceph, 9p, AFS, and NFS clients; a remote file server controls when read/write completions arrive over the network and can time responses to hit the lockless subrequest list race during collection.\nAC:L - The attacker controls both sides of the concurrency (issuing concurrent reads/writes and timing remote completions); on weakly-ordered architectures the missing barriers can cause deterministic misordering without relying on rare external conditions.\nPR:N - A malicious or compromised remote SMB/Ceph/NFS server needs no local privileges on the victim; exploitation only requires the victim system to perform I/O against an already-mounted network filesystem share.\nUI:N - On servers and enterprise systems with persistent fstab/autofs mounts, automated processes (writeback, readahead, backup daemons) trigger netfs I/O without live end-user action at exploit time.\nS:U - Impact is kernel memory corruption and privilege escalation within the same kernel security boundary; this is not a VM escape or cross-authority boundary bypass.\nC:H - Premature removal and freeing of in-flight subrequests is a use-after-free; the collector may read freed `netfs_io_subrequest` memory and stale counters, enabling arbitrary kernel memory disclosure.\nI:H - The UAF and concurrent access to subrequest fields while I/O handlers still run can corrupt heap metadata and subrequest state, providing a path to arbitrary kernel writes or code execution.\nA:H - Freeing active subrequests while SMB/Ceph completion handlers still reference them can cause kernel oops, BUG, or panic from use-after-free and list corruption."
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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/netfs/buffered_read.c",
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"fs/netfs/misc.c",
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"fs/netfs/read_collect.c",
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"fs/netfs/write_collect.c",
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"fs/netfs/write_issue.c",
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"include/linux/list.h"
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],
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"versions": [
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{
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"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068",
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"lessThan": "f048f297d93fdb19d72d01d22f04c419d8b16602",
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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": "288ace2f57c9d06dd2e42bd80d03747d879a4068",
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"lessThan": "293a4532c36f38458e38b8879b174ab797718b9d",
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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": "288ace2f57c9d06dd2e42bd80d03747d879a4068",
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"lessThan": "b5782e2d462c028096f922abca46318cec890670",
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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/netfs/buffered_read.c",
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"fs/netfs/misc.c",
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"fs/netfs/read_collect.c",
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"fs/netfs/write_collect.c",
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"fs/netfs/write_issue.c",
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"include/linux/list.h"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.18.57",
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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": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.18.57"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f048f297d93fdb19d72d01d22f04c419d8b16602"
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},
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{
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"url": "https://git.kernel.org/stable/c/293a4532c36f38458e38b8879b174ab797718b9d"
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},
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{
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"url": "https://git.kernel.org/stable/c/b5782e2d462c028096f922abca46318cec890670"
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}
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],
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"title": "netfs: Fix missing barriers when accessing stream->subrequests locklessly",
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} |