142 lines
8.0 KiB
JSON
142 lines
8.0 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-2026-80713",
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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": "2026-08-26T14:34:25.788Z",
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"datePublished": "2026-08-28T06:53:12.438Z",
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"dateUpdated": "2026-08-29T06:22:29.500Z"
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},
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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": "2026-08-29T06:22:29.500Z"
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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: preserve task restrictions across exec\n\nPer-task restrictions apply to all rings created by a task. Once\ninstalled, they should not be dropped across exec.\n\nFor a task that has used io_uring, the exec cancellation path calls\n__io_uring_free(). This frees both the task context and the per-task\nrestriction, so a ring created after exec is unrestricted.\n\nSplit task context cleanup into io_uring_free_tctx(), and use it from\nthe exec cancellation path. Keep __io_uring_free() for final task\ncleanup, where both the context and restriction are released."
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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:C/C:H/I:H/A:N",
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"baseScore": 8.4,
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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 flaw is reached only via local io_uring syscalls (io_uring_setup/io_uring_register) and execve(); fs/exec.c calls io_uring_task_cancel() which invokes the buggy __io_uring_free() path, and per kernel guidance io_uring is Local not Network.\nAC:L - The attacker fully controls the trigger by calling io_uring_setup() to create a task context then execve(); exec deterministically runs io_uring_cancel_generic(true) and frees per-task restrictions without races, special memory layout, or other uncontrollable conditions.\nPR:L - Exploitation requires only an unprivileged local process that had per-task io_uring restrictions installed by a parent/sandbox; the attacker needs no init-namespace CAP_SYS_ADMIN and can use io_uring unless blocked by sysctl or LSM policy.\nUI:N - No victim interaction is required; the confined attacker process itself performs io_uring_setup and execve to drop restrictions, then io_uring_setup again to obtain an unrestricted ring without administrator or other-user action.\nS:C - Per-task io_uring restrictions are a confinement policy enforced by a separate sandbox/parent authority; clearing them across exec lets post-exec code exceed that policy and access kernel interfaces explicitly withheld, crossing the intended sandbox security boundary.\nC:H - Dropping restrictions re-enables blocked io_uring SQEs, register operations, and BPF filters, including IORING_OP_URING_CMD and read-oriented ops against kernel/driver interfaces denied by policy, enabling disclosure beyond the confinement authority's intent.\nI:H - Bypass restores the full unrestricted io_uring opcode and register surface (writes, open/link ops, IORING_OP_URING_CMD, buffer/file registration), allowing post-exec integrity-affecting kernel and driver interactions explicitly denied by per-task restrictions.\nA:N - The vulnerability only incorrectly frees restriction metadata during exec cleanup; it does not directly cause kernel panics, oopses, deadlocks, or hangs, so there is no availability impact from the bug itself."
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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/cancel.c",
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"io_uring/tctx.c",
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"io_uring/tctx.h"
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],
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"versions": [
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{
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"lessThan": "fcef9325afeecced693a7438e975e4a3f8e2716f",
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"status": "affected",
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"versionType": "git"
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{
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"status": "affected",
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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/cancel.c",
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"io_uring/tctx.c",
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"io_uring/tctx.h"
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],
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"versions": [
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{
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"version": "7.0",
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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": "7.0",
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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": "7.1.8",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.1.8"
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},
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{
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"vulnerable": true,
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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/fcef9325afeecced693a7438e975e4a3f8e2716f"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc0e8faf90e776a2f1f3967a04e8091e6bdb4977"
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}
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],
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"title": "io_uring: preserve task restrictions across exec",
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