{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80713","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.788Z","datePublished":"2026-08-28T06:53:12.438Z","dateUpdated":"2026-08-29T06:22:29.500Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-29T06:22:29.500Z"},"descriptions":[{"lang":"en","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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/cancel.c","io_uring/tctx.c","io_uring/tctx.h"],"versions":[{"version":"ed82f35b926b2e505c14b7006473614b8f58b4f4","lessThan":"fcef9325afeecced693a7438e975e4a3f8e2716f","status":"affected","versionType":"git"},{"version":"ed82f35b926b2e505c14b7006473614b8f58b4f4","lessThan":"bc0e8faf90e776a2f1f3967a04e8091e6bdb4977","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/cancel.c","io_uring/tctx.c","io_uring/tctx.h"],"versions":[{"version":"7.0","status":"affected"},{"version":"0","lessThan":"7.0","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/fcef9325afeecced693a7438e975e4a3f8e2716f"},{"url":"https://git.kernel.org/stable/c/bc0e8faf90e776a2f1f3967a04e8091e6bdb4977"}],"title":"io_uring: preserve task restrictions across exec","x_generator":{"engine":"bippy-1.2.0"}}}}