138 lines
7.2 KiB
JSON
138 lines
7.2 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-2025-68243",
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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": "2025-12-16T13:41:40.263Z",
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"datePublished": "2025-12-16T14:21:20.421Z",
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"dateUpdated": "2026-08-05T12:10:25.864Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:10:25.864Z"
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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\nNFS: Check the TLS certificate fields in nfs_match_client()\n\nIf the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the\ncert_serial and privkey_serial fields need to match as well since they\ndefine the client's identity, as presented to the server."
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}
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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 matching occurs during local NFS client setup or an internal referral/pNFS automount. A local attacker can consume an incorrectly credentialed mount, but arbitrary network packets alone cannot create the required client collision.\nAC:H - Exploitation requires a pre-existing mTLS client in the same network namespace with matching endpoint, protocol, NFS version, and minor version but a different, more privileged certificate, created in the favorable order. These deployment conditions are outside an unprivileged attacker’s control.\nPR:L - Directly creating the conflicting mount requires initial-user-namespace CAP_SYS_ADMIN because affected NFS filesystems lack FS_USERNS_MOUNT. However, an ordinary local user with access to an administrator-created misbound mount can exploit the stronger certificate identity.\nUI:N - Once the conflicting mounts or internal NFS clients exist, the attacker can access the misbound mount directly without another user taking an action.\nS:U - The flaw changes which NFS client identity the kernel presents but does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - Reusing a more privileged client certificate can bypass server-side certificate authorization and expose entire sensitive NFS exports to unauthorized reads.\nI:H - If the inherited certificate authorizes write access, the attacker can modify or delete arbitrary data throughout protected NFS exports.\nA:H - The stronger identity can authorize destructive operations against service-critical exports, permitting deletion or corruption that makes the hosted data or dependent services unavailable."
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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/nfs/client.c"
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],
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"versions": [
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{
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"version": "90c9550a8d65fb9b1bf87baf97a04ed91bf61b33",
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"lessThan": "b8fa37219074811c04d4ecb742c73e2b296da6a8",
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"status": "affected",
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}
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{
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"product": "Linux",
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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/nfs/client.c"
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],
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"versions": [
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{
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"version": "6.17",
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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": "6.17",
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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": "6.17.9",
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"lessThanOrEqual": "6.17.*",
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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",
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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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"versionStartIncluding": "6.17",
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"versionEndExcluding": "6.17.9"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b8fa37219074811c04d4ecb742c73e2b296da6a8"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb2cba0854a7f315c8100a807a6959b99d72479e"
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}
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],
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"title": "NFS: Check the TLS certificate fields in nfs_match_client()",
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