138 lines
6.9 KiB
JSON
138 lines
6.9 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-2025-40291",
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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": "2025-04-16T07:20:57.185Z",
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"datePublished": "2025-12-08T00:46:14.601Z",
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"dateUpdated": "2026-08-05T12:09:17.336Z"
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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": "2026-08-05T12:09:17.336Z"
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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\nio_uring: fix regbuf vector size truncation\n\nThere is a report of io_estimate_bvec_size() truncating the calculated\nnumber of segments that leads to corruption issues. Check it doesn't\noverflow \"int\"s used later. Rough but simple, can be improved on top."
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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 code is reached only through io_uring SQE submission (READV_FIXED/WRITEV_FIXED, zerocopy sendmsg, fixed uring_cmd), a local syscall interface; there is no remote network trigger despite one caller being in net.c.\nAC:L - The attacker fully controls the registered buffer and the iovec lengths that drive the truncated size estimate, so the under-allocation and out-of-bounds write are triggered deterministically with no race or uncontrolled condition.\nPR:L - Any unprivileged local user can create an io_uring instance and register buffers; io_uring is enabled by default (sysctl_io_uring_disabled=0) and requires no capabilities.\nUI:N - The attacker triggers the flaw entirely through their own io_uring operations with no victim interaction required.\nS:U - The corruption occurs within kernel heap memory in the same security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The integer-truncation-driven heap out-of-bounds access corrupts adjacent kernel objects and can be leveraged for arbitrary kernel-memory disclosure.\nI:H - The under-sized bvec allocation causes an out-of-bounds write of attacker-influenced bio_vec structures past the buffer, giving a heap write primitive exploitable for control-flow hijacking.\nA:H - The out-of-bounds heap write reliably corrupts kernel memory, causing oops/panic and 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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"io_uring/rsrc.c"
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],
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"versions": [
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{
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"version": "9ef4cbbcb4ac3786a1a4164507511b76b2a572c5",
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"lessThan": "826ce37a842633efe1bb763e4b13045d74060d72",
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"status": "affected",
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"versionType": "git"
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},
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{
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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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"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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"io_uring/rsrc.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.17.8",
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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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}
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],
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"cpeApplicability": [
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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": "6.15",
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"versionEndExcluding": "6.17.8"
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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": "6.15",
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"versionEndExcluding": "6.18"
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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/826ce37a842633efe1bb763e4b13045d74060d72"
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},
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{
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"url": "https://git.kernel.org/stable/c/146eb58629f45f8297e83d69e64d4eea4b28d972"
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}
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],
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"title": "io_uring: fix regbuf vector size truncation",
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"x_generator": {
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