138 lines
7.5 KiB
JSON
138 lines
7.5 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-2026-31484",
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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": "2026-03-09T15:48:24.101Z",
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"datePublished": "2026-04-22T13:54:10.223Z",
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"dateUpdated": "2026-08-05T12:22:59.333Z"
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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": "2026-08-05T12:22:59.333Z"
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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/fdinfo: fix OOB read in SQE_MIXED wrap check\n\n__io_uring_show_fdinfo() iterates over pending SQEs and, for 128-byte\nSQEs on an IORING_SETUP_SQE_MIXED ring, needs to detect when the second\nhalf of the SQE would be past the end of the sq_sqes array. The current\ncheck tests (++sq_head & sq_mask) == 0, but sq_head is only incremented\nwhen a 128-byte SQE is encountered, not on every iteration. The actual\narray index is sq_idx = (i + sq_head) & sq_mask, which can be sq_mask\n(the last slot) while the wrap check passes.\n\nFix by checking sq_idx directly. Keep the sq_head increment so the loop\nstill skips the second half of the 128-byte SQE on the next iteration."
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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:N/A:H",
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"baseScore": 7.1,
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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 locally by creating an io_uring instance and reading its procfs fdinfo entry; there is no network or adjacent attack surface.\nAC:L - The attacker controls the ring setup flags, SQ tail, SQ array mapping, and 128-byte SQE opcode needed to place a mixed SQE at the last physical slot. No race or external timing condition is required, and transient lock contention can be retried.\nPR:L - A normal unprivileged local user can use io_uring when the default io_uring sysctl allows it and can read /proc/self/fdinfo for its own fd. No real root or init-namespace capability is required.\nUI:N - The attacker triggers the bug by reading their own fdinfo file. No victim action is needed.\nS:U - The issue is a local kernel memory access bug within the same kernel security authority. It does not cross a VM, IOMMU, or other separate security scope boundary.\nC:H - The bug prints the second half of a 128-byte SQE by dereferencing up to 64 bytes past the SQE array, exposing adjacent kernel memory through procfs. The leak is attacker-triggerable and repeatable, so the highest defensible confidentiality impact is high.\nI:N - The vulnerable operation is an out-of-bounds read used for fdinfo printing and does not write to kernel memory or directly modify protected state.\nA:H - The same out-of-bounds kernel dereference can cross the end of the SQE allocation or a vmap-backed region and fault/oops depending on allocation layout. An unprivileged attacker can repeatedly trigger the path, so availability impact is high."
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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/fdinfo.c"
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],
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"versions": [
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{
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"version": "1cba30bf9fdd6c982708f3587f609a30c370d889",
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"lessThan": "ba21ab247a5be5382da7464b95afbe5f0e9aa503",
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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": "1cba30bf9fdd6c982708f3587f609a30c370d889",
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"lessThan": "5170efd9c344c68a8075dcb8ed38d3f8a60e7ed4",
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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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"io_uring/fdinfo.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "6.19.11",
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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": "6.19",
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"versionEndExcluding": "6.19.11"
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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": "6.19",
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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/ba21ab247a5be5382da7464b95afbe5f0e9aa503"
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},
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{
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"url": "https://git.kernel.org/stable/c/5170efd9c344c68a8075dcb8ed38d3f8a60e7ed4"
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}
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],
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"title": "io_uring/fdinfo: fix OOB read in SQE_MIXED wrap check",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |