248 lines
12 KiB
JSON
248 lines
12 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-2021-47040",
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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": "2024-02-27T18:42:55.968Z",
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"datePublished": "2024-02-28T08:13:46.557Z",
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"dateUpdated": "2026-08-05T08:45:40.950Z"
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},
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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: fix overflows checks in provide buffers\n\nColin reported before possible overflow and sign extension problems in\nio_provide_buffers_prep(). As Linus pointed out previous attempt did nothing\nuseful, see d81269fecb8ce (\"io_uring: fix provide_buffers sign extension\").\n\nDo that with help of check_<op>_overflow helpers. And fix struct\nio_provide_buf::len type, as it doesn't make much sense to keep it\nsigned."
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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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},
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only through local io_uring syscalls (io_uring_setup/io_uring_enter) submitting IORING_OP_PROVIDE_BUFFERS; it is not reachable from network packet processing.\nAC:L - The attacker fully controls sqe addr/len/nbufs and can reliably choose values that overflow len*nbufs (especially on 32-bit, e.g. size wrapping to 0) so the access_ok check validates far less than the registered range.\nPR:L - An unprivileged local user can create an io_uring instance and submit PROVIDE_BUFFERS with no capability requirement; the later io_uring_disabled sysctl did not exist in the affected versions.\nUI:N - Exploitation requires no victim action; the attacker triggers the bug entirely with their own io_uring submissions and subsequent BUFFER_SELECT I/O.\nS:U - Impact is limited to the local kernel's authority (local privilege escalation / memory safety), with no VM, IOMMU, or other security-authority boundary crossed.\nC:H - Overflow bypasses the sole access_ok validation for provided buffers that BUFFER_SELECT paths later trust, enabling registration of ranges that can include kernel addresses and yield arbitrary kernel memory disclosure when used for reads.\nI:H - The same access_ok bypass lets attacker-controlled provided-buffer addresses/lengths be used for kernel writes via BUFFER_SELECT recv/read paths, which is memory corruption exploitable for integrity compromise and code execution.\nA:H - Invalid provided-buffer ranges and signed-length mishandling can cause kernel faults, oopses, or otherwise crash/hang the system when the corrupted buffers are selected for I/O."
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}
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/io_uring.c"
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"version": "5.13",
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"status": "unaffected",
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