201 lines
10 KiB
JSON
201 lines
10 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-2026-64217",
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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": "2026-07-19T15:36:31.770Z",
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"datePublished": "2026-07-24T15:23:05.261Z",
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"dateUpdated": "2026-08-05T12:40:05.203Z"
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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": "2026-08-05T12:40:05.203Z"
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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 overrun check in netfs_extract_user_iter()\n\nFix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills\npages[], then those pages don't get included in the iterator constructed at\nthe end of the function. If there was an overfill, memory corruption has\nalready happened."
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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 - The vulnerable helper is reached through local direct or unbuffered I/O against CIFS/SMB3, AFS, or 9P files. Remote peers cannot directly control the local user iterator that triggers extraction.\nAC:L - The attacker controls and can repeatedly submit the UBUF or IOVEC layout, and corruption occurs synchronously once the overfill condition is reached. No race, timing window, or victim-controlled state is required.\nPR:L - An ordinary unprivileged process with permission to access a file on an existing affected mount can reach the helper. No capability or administrative privilege is checked on the I/O path.\nUI:N - The attacker directly opens and performs I/O on the accessible file without requiring another user to act. An existing affected mount is a deployment prerequisite, not per-attack victim interaction.\nS:U - The corruption compromises the same host kernel that processes the local I/O. It does not inherently cross a VM, IOMMU, or other distinct security authority.\nC:H - The overfill writes page pointers beyond the allocated kernel buffer and the malformed bvec can subsequently access unpopulated descriptors. Exploitation of this kernel heap corruption can expose arbitrary kernel memory.\nI:H - The bug produces an out-of-bounds kernel heap write and can cause adjacent memory to be interpreted as bvec descriptors. Heap grooming could turn this into arbitrary memory modification or control-flow hijacking.\nA:H - The corruption can cause a kernel oops, panic, or hang, while aborted extraction can also leak pinned pages. An attacker can repeat the triggering I/O to sustain denial of service."
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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/iterator.c"
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],
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"versions": [
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{
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"version": "85dd2c8ff368b1446be9febde84afe1d7aec4261",
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"lessThan": "00efe58bbdcc93272d579ca24bfc912563f4a204",
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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": "85dd2c8ff368b1446be9febde84afe1d7aec4261",
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"lessThan": "96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9",
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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": "85dd2c8ff368b1446be9febde84afe1d7aec4261",
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"lessThan": "afeb32d9bf9aaeea51d0f723a19f14afb73bd94d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "f48b9157f0f611fa436c360648603d5ded719b12",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "0ef37eef83fad3542ee06db2940433ae1a92b39d",
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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/iterator.c"
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],
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"versions": [
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{
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"version": "6.3",
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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": "6.3",
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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": "6.6.142",
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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": "6.12.92",
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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": "6.18.34",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "6.6.142"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/00efe58bbdcc93272d579ca24bfc912563f4a204"
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},
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{
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"url": "https://git.kernel.org/stable/c/96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9"
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},
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{
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"url": "https://git.kernel.org/stable/c/afeb32d9bf9aaeea51d0f723a19f14afb73bd94d"
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},
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{
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"url": "https://git.kernel.org/stable/c/f48b9157f0f611fa436c360648603d5ded719b12"
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},
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{
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"url": "https://git.kernel.org/stable/c/0ef37eef83fad3542ee06db2940433ae1a92b39d"
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}
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],
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"title": "netfs: Fix overrun check in netfs_extract_user_iter()",
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"x_generator": {
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} |