214 lines
11 KiB
JSON
214 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2023-52903",
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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": "2024-08-21T06:07:11.014Z",
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"datePublished": "2024-08-21T06:10:43.857Z",
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"dateUpdated": "2026-08-05T09:11:53.830Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:11:53.830Z"
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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: lock overflowing for IOPOLL\n\nsyzbot reports an issue with overflow filling for IOPOLL:\n\nWARNING: CPU: 0 PID: 28 at io_uring/io_uring.c:734 io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734\nCPU: 0 PID: 28 Comm: kworker/u4:1 Not tainted 6.2.0-rc3-syzkaller-16369-g358a161a6a9e #0\nWorkqueue: events_unbound io_ring_exit_work\nCall trace:\n io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734\n io_req_cqe_overflow+0x5c/0x70 io_uring/io_uring.c:773\n io_fill_cqe_req io_uring/io_uring.h:168 [inline]\n io_do_iopoll+0x474/0x62c io_uring/rw.c:1065\n io_iopoll_try_reap_events+0x6c/0x108 io_uring/io_uring.c:1513\n io_uring_try_cancel_requests+0x13c/0x258 io_uring/io_uring.c:3056\n io_ring_exit_work+0xec/0x390 io_uring/io_uring.c:2869\n process_one_work+0x2d8/0x504 kernel/workqueue.c:2289\n worker_thread+0x340/0x610 kernel/workqueue.c:2436\n kthread+0x12c/0x158 kernel/kthread.c:376\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:863\n\nThere is no real problem for normal IOPOLL as flush is also called with\nuring_lock taken, but it's getting more complicated for IOPOLL|SQPOLL,\nfor which __io_cqring_overflow_flush() happens from the CQ waiting path."
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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 bug is in io_uring IOPOLL completion overflow (`io_do_iopoll` → `io_fill_cqe_req` → `io_req_cqe_overflow`), reachable only via local `io_uring_setup`/`io_uring_enter` on an attacker-owned ring, not via network packet processing.\nAC:L - An attacker can force CQ overflow on an IOPOLL ring while concurrently posting aux CQEs (e.g. `IORING_MSG_DATA` via msg_ring’s `io_post_aux_cqe`, which took only `completion_lock`) so both sides of the `cq_overflow_list` race are attacker-controlled.\nPR:L - io_uring is usable by unprivileged local users by default (`kernel.io_uring_disabled=0`); IOPOLL and msg_ring require no CAP_SYS_ADMIN or init-namespace root.\nUI:N - The attacker creates the ring(s), submits IOPOLL work, overflows the CQ, and drives concurrent overflow/aux posting themselves; no victim action is required.\nS:U - Impact is kernel memory corruption within the host OS authority (local privilege escalation); no VM escape, IOMMU bypass, or sandbox boundary is crossed.\nC:H - Missing `completion_lock` while mutating `cq_overflow_list` races with other overflow/aux posters holding that lock, enabling linked-list corruption and use-after-free of overflow entries that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Concurrent unlocked list add/delete/kfree on `cq_overflow_list` yields classic heap UAF/double-free primitives exploitable for arbitrary write and control-flow hijacking.\nA:H - The same race can oops/panic the kernel via list corruption, and the observed lockdep path is a `WARN` in `io_cqring_event_overflow` (High under panic_on_warn / oops deployments)."
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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/rw.c"
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],
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"version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e",
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"io_uring/rw.c"
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"version": "0",
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"lessThan": "5.1",
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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": "5.10.165",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.89",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.7",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.2",
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"status": "unaffected",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/de77faee280163ff03b7ab64af6c9d779a43d4c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed4629d1e968359fbb91d0a3780b1e86a2c08845"
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},
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"url": "https://git.kernel.org/stable/c/7fc3990dad04a677606337ebc61964094d6cb41b"
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{
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"url": "https://git.kernel.org/stable/c/544d163d659d45a206d8929370d5a2984e546cb7"
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}
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],
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"title": "io_uring: lock overflowing for IOPOLL",
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"content": {
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"id": "CVE-2023-52903",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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{
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"Technical Impact": "partial"
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"version": "2.0.3",
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"timestamp": "2024-09-10T16:03:21.069603Z"
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} |