195 lines
11 KiB
JSON
195 lines
11 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-2024-56709",
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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": "2024-12-27T15:00:39.857Z",
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"datePublished": "2024-12-29T08:42:58.403Z",
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"dateUpdated": "2026-08-05T11:46:12.483Z"
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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": "2026-08-05T11:46:12.483Z"
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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: check if iowq is killed before queuing\n\ntask work can be executed after the task has gone through io_uring\ntermination, whether it's the final task_work run or the fallback path.\nIn this case, task work will find ->io_wq being already killed and\nnull'ed, which is a problem if it then tries to forward the request to\nio_queue_iowq(). Make io_queue_iowq() fail requests in this case.\n\nNote that it also checks PF_KTHREAD, because the user can first close\na DEFER_TASKRUN ring and shortly after kill the task, in which case\n->iowq check would race."
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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 vulnerability is reached purely through the io_uring syscall interface (io_uring_setup/io_uring_enter, SQE submission, and close(2) of the ring fd), which requires local access to the machine. Per kernel scoring guidance io_uring bugs are Local.\nAC:L - The attacker controls both sides of the race — they choose exactly when to close the DEFER_TASKRUN ring (driving the request into the PF_KTHREAD fallback worker) and when to exit the submitting task (driving io_wq_put_and_exit/kfree), and can retry the whole sequence in a fresh process arbitrarily many times. The NULL-io_wq/BUG_ON variant is essentially deterministic once the exit ordering is arranged.\nPR:L - Any unprivileged local user with default io_uring access can create the ring, submit an IOSQE_ASYNC/IOSQE_IO_DRAIN request (REQ_F_FORCE_ASYNC), and trigger the exit race; no capabilities, root, or user-namespace tricks are required.\nUI:N - The entire sequence is performed by the attacker's own process and threads with no victim action of any kind.\nS:U - The corruption and its consequences are confined to the Linux kernel's own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed struct io_wq is read back after kfree (wq->state, wq->acct[], wq->free_list, wq->task, wq->do_work/free_work), so an attacker who reclaims the kmalloc-1k slot obtains a use-after-free read primitive over kernel heap contents, and per guidance a UAF is scored High.\nI:H - io_run_cancel() invokes wq->do_work(work) and wq->free_work(work) — indirect calls through function pointers read from the freed, attacker-reclaimable allocation — and io_wq_insert_work() writes list pointers into that freed memory, giving control-flow hijack and write primitives suitable for privilege escalation.\nA:H - The NULL-io_wq path hits BUG_ON() for a guaranteed kernel oops (full panic with panic_on_oops), and because it fires inside io_fallback_req_func() while holding ctx->uring_lock the mutex is leaked, permanently hanging io_ring_exit_work and any task touching that ring; the UAF variant additionally crashes on freed memory."
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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": "773af69121ecc6c53d192661af8d53bb3db028ae",
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"lessThan": "534d59ab38010aada88390db65985e65d0de7d9e",
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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": "773af69121ecc6c53d192661af8d53bb3db028ae",
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"lessThan": "2ca94c8de36091067b9ce7527ae8db3812d38781",
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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": "773af69121ecc6c53d192661af8d53bb3db028ae",
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"lessThan": "4f95a2186b7f2af09331e1e8069bcaf34fe019cf",
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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": "773af69121ecc6c53d192661af8d53bb3db028ae",
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"lessThan": "dbd2ca9367eb19bc5e269b8c58b0b1514ada9156",
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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": "5.14",
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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": "5.14",
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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": "6.1.122",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.68",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.7",
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"lessThanOrEqual": "6.12.*",
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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": "6.13",
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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": "5.14",
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"versionEndExcluding": "6.1.122"
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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": "5.14",
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"versionEndExcluding": "6.6.68"
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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": "5.14",
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"versionEndExcluding": "6.12.7"
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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": "5.14",
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"versionEndExcluding": "6.13"
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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/534d59ab38010aada88390db65985e65d0de7d9e"
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},
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{
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"url": "https://git.kernel.org/stable/c/2ca94c8de36091067b9ce7527ae8db3812d38781"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f95a2186b7f2af09331e1e8069bcaf34fe019cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/dbd2ca9367eb19bc5e269b8c58b0b1514ada9156"
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}
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],
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"title": "io_uring: check if iowq is killed before queuing",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T20:53:02.240Z"
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}
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}
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]
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}
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} |