368 lines
18 KiB
JSON
368 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2023-52436",
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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": "2024-02-20T12:30:33.290Z",
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"datePublished": "2024-02-20T18:34:47.387Z",
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"dateUpdated": "2026-08-15T12:23:45.392Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-15T12:23:45.392Z"
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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\nf2fs: explicitly null-terminate the xattr list\n\nWhen setting an xattr, explicitly null-terminate the xattr list. This\neliminates the fragile assumption that the unused xattr space is always\nzeroed."
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{
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is reached via local setxattr/lsetxattr/fsetxattr (or setfacl→ACL xattrs) into f2fs_setxattr/__f2fs_setxattr; it is not reachable from the network stack or remote filesystem servers.\nAC:L - An attacker who can write xattrs on an f2fs inode can reliably invoke the buggy set path; exploitation does not depend on a race or other condition outside the attacker’s influence once residual non-zero unused xattr bytes exist (common on flash/corrupt or previously dirty xattr regions).\nPR:L - user.* xattrs are enabled by default and only require an unprivileged caller with MAY_WRITE on their own file/dir (typical Android app on f2fs userdata); CAP_SYS_ADMIN is not required.\nUI:N - On a system where f2fs is already mounted (e.g., Android /data), the attacker triggers the bug directly via syscalls with no victim action such as mounting a malicious image.\nS:U - Impact stays within the host kernel’s authority (local memory corruption / privilege boundary of the same OS); this is not a VM, IOMMU, or other cross-authority escape.\nC:H - An unterminated xattr list causes out-of-bounds reads while walking entries (historically KASAN slab-OOB in getxattr and leakage via listxattr), which can disclose arbitrary kernel memory when bounds checks are absent or bypassed.\nI:H - Out-of-bounds parsing of attacker-influenced leftover xattr bytes can corrupt adjacent kernel memory and is treated as enabling write/control-flow impact under the overestimate-severity rule for memory-corruption bugs.\nA:H - The same OOB walks have caused kernel page faults/oopses and hard failures in related f2fs xattr corruption bugs, so availability impact is a full kernel crash."
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