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-2026-43442",
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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": "2026-05-01T14:12:56.009Z",
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"datePublished": "2026-05-08T14:22:10.656Z",
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"dateUpdated": "2026-08-05T12:27:59.003Z"
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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": "2026-08-05T12:27:59.003Z"
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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 physical SQE bounds check for SQE_MIXED 128-byte ops\n\nWhen IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY,\nthe boundary check for 128-byte SQE operations in io_init_req()\nvalidated the logical SQ head position rather than the physical SQE\nindex.\n\nThe existing check:\n\n !(ctx->cached_sq_head & (ctx->sq_entries - 1))\n\nensures the logical position isn't at the end of the ring, which is\ncorrect for NO_SQARRAY rings where physical == logical. However, when\nsq_array is present, an unprivileged user can remap any logical\nposition to an arbitrary physical index via sq_array. Setting\nsq_array[N] = sq_entries - 1 places a 128-byte operation at the last\nphysical SQE slot, causing the 128-byte memcpy in\nio_uring_cmd_sqe_copy() to read 64 bytes past the end of the SQE\narray.\n\nReplace the cached_sq_head alignment check with a direct validation\nof the physical SQE index, which correctly handles both sq_array and\nNO_SQARRAY cases."
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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 through local io_uring syscalls and userspace-controlled SQ/SQE mappings, not by remote packets or physical access.\nAC:L - The attacker controls ring setup flags, sq_array contents, SQEs, and submission order; no race or external timing condition is required.\nPR:L - A basic unprivileged local user can create io_uring instances on the default kernel.io_uring_disabled=0 configuration and can use accessible uring_cmd files such as /dev/null or sockets.\nUI:N - Exploitation only requires the attacker's own syscall sequence and mapped ring manipulation, with no victim action.\nS:U - The issue remains within the kernel security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bad 128-byte memcpy can read 64 bytes past the SQE array; for page-boundary layouts this can read adjacent kernel memory, so confidentiality impact is high.\nI:N - The investigated primitive is an out-of-bounds read into a valid request buffer, with no out-of-bounds write or direct arbitrary modification primitive identified.\nA:H - The same out-of-bounds read can fault or trigger kernel diagnostics/oops conditions and is repeatable by the local attacker."
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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/io_uring.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": "1f794f9bed3e5cf7250a3b4daf112a72ed1513e9",
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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": "6f02c6b196036dbb6defb4647d8707d29b7fe95b",
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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/io_uring.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": "6.19.9",
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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": "6.19",
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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": "6.19",
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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/1f794f9bed3e5cf7250a3b4daf112a72ed1513e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f02c6b196036dbb6defb4647d8707d29b7fe95b"
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}
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],
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"title": "io_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |