320 lines
16 KiB
JSON
320 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-2026-64600",
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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": "2026-07-19T15:36:31.799Z",
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"datePublished": "2026-07-23T05:46:56.149Z",
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"dateUpdated": "2026-10-19T20:48:43.886Z"
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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": "2026-08-17T04:58:23.073Z"
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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\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping. Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK. Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don't refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping. Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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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:L - Exploitation uses local FICLONE and concurrent O_DIRECT write syscalls against an XFS filesystem.\nAC:L - The attacker controls both racing writers, can amplify the transaction-allocation window, and demonstrated exploitation typically succeeds within seconds.\nPR:L - A basic unprivileged local user needs only read access to the protected source and write access to a scratch file; no capabilities are required.\nUI:N - The attacker creates the reflink and triggers both sides of the race without any victim action.\nS:U - This is a standard local kernel-mediated privilege escalation affecting resources within the host operating system's existing security authority.\nC:H - Overwriting /etc/passwd or a readable SUID-root binary yields full root access and consequently unrestricted access to system-confidential data.\nI:H - The stale physical mapping provides attacker-controlled persistent writes into protected readable files while preserving their ownership and SUID metadata, enabling full root compromise.\nA:H - The attacker can persistently corrupt boot-critical binaries or configuration files and, after obtaining root, cause complete system unavailability."
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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/xfs/xfs_reflink.c"
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],
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"versions": [
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{
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"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "dc11be133efca5fe3a2fb02b016dee825cc12f18",
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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": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "b8c9aa832b52680ee40d6cab0efb081f9a69df05",
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"status": "affected",
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},
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{
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"version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "50f0012da1040f69a4e788cd9aed587c9a04983f",
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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": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "e705d81a7193dd19e69b8e2bad4696d78a4ea075",
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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": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "206c09b04dc5469c7ff14d8aceff2d47c88078d9",
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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": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "44f891bc088958399eec27f7604928694aa35581",
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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": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
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"lessThan": "2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7",
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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/xfs/xfs_reflink.c"
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],
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"versions": [
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{
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"version": "4.11",
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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": "4.11",
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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": "5.15.212",
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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": "6.1.178",
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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": "6.6.145",
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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": "6.12.96",
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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": "6.18.39",
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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": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.11",
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"url": "https://git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075"
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"url": "https://git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9"
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{
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"url": "https://git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581"
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{
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"url": "https://cdn2.qualys.com/advisory/2026/07/22/RefluXFS.txt"
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}
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],
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"title": "xfs: resample the data fork mapping after cycling ILOCK",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"title": "CVE Program Container",
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"references": [
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{
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"url": "http://www.openwall.com/lists/oss-security/2026/07/22/14"
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"url": "http://www.openwall.com/lists/oss-security/2026/07/22/18"
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"url": "http://www.openwall.com/lists/oss-security/2026/07/22/19"
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"url": "http://www.openwall.com/lists/oss-security/2026/07/31/3"
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}
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-64600",
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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": "no"
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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": "2026-10-16T15:43:31.132977Z"
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}
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],
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"descriptions": [
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-362",
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"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
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}
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]
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}
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],
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} |