184 lines
9.8 KiB
JSON
184 lines
9.8 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-2026-43403",
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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": "2026-05-01T14:12:56.007Z",
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"datePublished": "2026-05-08T14:21:44.204Z",
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"dateUpdated": "2026-08-05T12:27:47.212Z"
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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": "2026-08-05T12:27:47.212Z"
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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\nnsfs: tighten permission checks for ns iteration ioctls\n\nEven privileged services should not necessarily be able to see other\nprivileged service's namespaces so they can't leak information to each\nother. Use may_see_all_namespaces() helper that centralizes this policy\nuntil the nstree adapts."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 path is reached by a local `ioctl()` on an nsfs mount-namespace file descriptor, such as one obtained from `/proc/self/ns/mnt` or pidfd namespace ioctls. There is no network, adjacent, or physical attack path.\nAC:L - Triggering is deterministic: open a mount namespace fd and issue `NS_MNT_GET_NEXT` or `NS_MNT_GET_PREV`. There is no race or special memory-layout condition required.\nPR:L - The pre-fix check only required `CAP_SYS_ADMIN` in the target mount namespace's owning user namespace, which can be satisfied through user namespaces in plausible deployments. Under the higher-severity rule, this is Low rather than High.\nUI:N - No victim interaction is needed once the attacker has local execution and the relevant namespace capability. The attacker directly invokes the ioctl.\nS:C - The bug lets one namespace-confined service obtain file descriptors for other mount namespaces, bypassing the intended namespace visibility boundary. That can cross container or service isolation boundaries.\nC:H - The returned namespace fd and mount namespace id allow enumeration with `listmount()` and `statmount()`, exposing mount topology, paths, sources, options, and related metadata from another namespace. In plausible privileged-container scenarios, the fd can also enable `setns()` into the target mount namespace and expose sensitive filesystem contents.\nI:H - With the leaked mount namespace fd and the same namespace capabilities required by the vulnerable path, an attacker can plausibly `setns()` into another mount namespace and modify writable files or mount state there. This can compromise integrity across the namespace boundary.\nA:H - After obtaining and entering another mount namespace in a privileged scenario, the attacker can disrupt that namespace by altering or unmounting resources or damaging writable files. This can cause high availability impact to the affected service or container."
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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/nsfs.c",
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"include/linux/ns_common.h",
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"kernel/nscommon.c"
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],
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"versions": [
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{
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"version": "a1d220d9dafa8d76ba60a784a1016c3134e6a1e8",
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"lessThan": "3376b345df155ca36d8611857b41ff7d5183fc38",
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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": "a1d220d9dafa8d76ba60a784a1016c3134e6a1e8",
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"lessThan": "2f3dea284c761c890d676f77d5e55c0c496b4ef4",
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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": "a1d220d9dafa8d76ba60a784a1016c3134e6a1e8",
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"lessThan": "0ad650e60150eda789deca5e78a6a09d26bf8fc9",
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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": "a1d220d9dafa8d76ba60a784a1016c3134e6a1e8",
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"lessThan": "e6b899f08066e744f89df16ceb782e06868bd148",
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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/nsfs.c",
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"include/linux/ns_common.h",
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"kernel/nscommon.c"
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],
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"versions": [
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{
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"version": "6.12",
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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": "6.12",
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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": "6.12.78",
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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": "6.18.20",
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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": "6.19.9",
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"lessThanOrEqual": "6.19.*",
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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",
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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": "6.12",
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"versionEndExcluding": "6.12.78"
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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": "6.12",
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"versionEndExcluding": "6.18.20"
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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": "6.12",
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"versionEndExcluding": "6.19.9"
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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": "6.12",
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"versionEndExcluding": "7.0"
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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/3376b345df155ca36d8611857b41ff7d5183fc38"
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},
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{
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"url": "https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4"
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},
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{
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"url": "https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9"
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},
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{
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"url": "https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148"
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}
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],
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"title": "nsfs: tighten permission checks for ns iteration ioctls",
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} |