275 lines
14 KiB
JSON
275 lines
14 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-2024-35880",
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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": "2024-05-17T13:50:33.111Z",
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"datePublished": "2024-05-19T08:34:37.262Z",
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"dateUpdated": "2026-08-05T11:30:38.073Z"
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},
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"dateUpdated": "2026-08-05T11:30:38.073Z"
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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/kbuf: hold io_buffer_list reference over mmap\n\nIf we look up the kbuf, ensure that it doesn't get unregistered until\nafter we're done with it. Since we're inside mmap, we cannot safely use\nthe io_uring lock. Rely on the fact that we can lookup the buffer list\nunder RCU now and grab a reference to it, preventing it from being\nunregistered until we're done with it. The lookup returns the\nio_buffer_list directly with it referenced."
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}
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"metrics": [
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{
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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 vulnerable path is entered only through local syscalls on an io_uring file descriptor — `mmap()` with `IORING_OFF_PBUF_RING` racing `io_uring_register(IORING_UNREGISTER_PBUF_RING)`. There is no network, adjacent, or remote-peer path into `io_uring_validate_mmap_request()`.\nAC:L - The attacker owns both sides of the race: one thread loops `mmap()` on the provided-buffer-ring offset while a second thread loops register/unregister of the same bgid on the same fd, with unlimited retries and no dependence on any condition outside the attacker's control.\nPR:L - Only an unprivileged local account is required — `io_uring_allowed()` permits any user when `sysctl_io_uring_disabled` is 0, which is the kernel default, and `IORING_REGISTER_PBUF_RING` with `IOU_PBUF_RING_MMAP` carries no capability check. This is reachable from inside containers and sandboxes as well.\nUI:N - The attacker performs every step itself — creating the ring, registering the buffer ring, and driving both racing threads. No victim action or interaction with any other user is needed.\nS:U - The defect and its consequences are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Without the reference, mmap consumes a `bl->buf_ring` address belonging to a buffer list being concurrently destroyed, and `remap_pfn_range()` installs a persistent `VM_PFNMAP` window onto kernel-allocated ring memory that has already been released back to the context's reusable region pool and can be re-handed to a different buffer group — an uncontrolled read of kernel memory, and per use-after-free scoring this is High.\nI:H - The resulting mapping is a writable `MAP_SHARED` view of that stale kernel region, so the attacker can write into memory the kernel no longer treats as belonging to the mapping's owner; use-after-free of a refcounted object also enables heap grooming toward a controlled-write primitive.\nA:H - Racing the teardown lets mmap operate on a `buf_ring` pointer being NULLed and on an `io_buffer_list` on its way to `kfree_rcu()`, producing oops/kernel panic; the race is repeatable at will by any local user, so availability loss is complete."
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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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"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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"io_uring/kbuf.c",
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"io_uring/kbuf.h"
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],
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"lessThanOrEqual": "6.8.*",
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"version": "6.9",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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