276 lines
14 KiB
JSON
276 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-2025-21832",
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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": "2024-12-29T08:45:45.777Z",
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"datePublished": "2025-03-06T16:22:34.125Z",
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"dateUpdated": "2026-10-15T21:51:53.845Z"
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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": "2026-08-05T11:54:48.618Z"
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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\nblock: don't revert iter for -EIOCBQUEUED\n\nblkdev_read_iter() has a few odd checks, like gating the position and\ncount adjustment on whether or not the result is bigger-than-or-equal to\nzero (where bigger than makes more sense), and not checking the return\nvalue of blkdev_direct_IO() before doing an iov_iter_revert(). The\nlatter can lead to attempting to revert with a negative value, which\nwhen passed to iov_iter_revert() as an unsigned value will lead to\nthrowing a WARN_ON() because unroll is bigger than MAX_RW_COUNT.\n\nBe sane and don't revert for -EIOCBQUEUED, like what is done in other\nspots."
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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 reached through local syscalls only — io_uring submission (or aio) of an O_DIRECT read against a block device file descriptor. There is no network-facing path into `blkdev_read_iter()`.\nAC:L - The attacker controls both sides of the race: setting `IOSQE_ASYNC` forces io-wq offload so the completion runs in parallel with the still-executing `blkdev_read_iter()`, and choosing a fast backing device (NVMe/brd/null_blk/loop) plus unbounded submission retries makes the window trivially winnable.\nPR:L - Only an unprivileged local account is needed, holding a readable block device node opened with O_DIRECT — commonly available via the disk/cdrom groups, udev uaccess on removable media, containers with device access, and embedded/automotive/IoT images where the application user has raw device access. No CAP_SYS_ADMIN or root is required.\nUI:N - The attacker submits the io_uring read entirely on their own; no victim action, mount, or file open by another user is involved.\nS:U - The freed object, the corruption, and the resulting impact are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free — `iov_iter_count()`/`iov_iter_revert()` read the recycled `io_async_rw` and walk backwards out of bounds through a freed or reused bvec/iovec array, and the resulting corrupted iter can be consumed by another in-flight request to DMA arbitrary kernel memory back to the attacker.\nI:H - `iov_iter_revert()` writes `count`, `iov_offset`, `nr_segs`, and the `bvec`/`__iov` pointer into freed/recycled heap memory with an attacker-influenced `unroll`, giving heap-spray-able corruption of a concurrently used iterator that is exploitable for out-of-bounds writes and control-flow hijacking.\nA:H - The reported symptom is a `WARN_ON()` in `iov_iter_revert()` (immediate panic under panic_on_warn), and for the common `ITER_UBUF`/xarray iters the same path hits an unconditional `BUG()`; the underlying use-after-free also crashes the kernel outright under KASAN or on heap corruption."
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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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"block/fops.c"
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],
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"versions": [
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{
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"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3",
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"lessThan": "6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb",
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"status": "affected",
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"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3",
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"lessThan": "84671b0630ccb46ae9f1f99a45c7d63ffcd6a474",
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"status": "affected",
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"status": "affected",
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"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3",
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"lessThan": "b13ee668e8280ca5b07f8ce2846b9957a8a10853",
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"status": "affected",
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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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"block/fops.c"
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],
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"versions": [
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{
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"version": "5.17",
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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": "5.17",
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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": "6.1.129",
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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": "6.6.78",
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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": "6.12.14",
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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": "6.13.3",
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"lessThanOrEqual": "6.13.*",
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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": "6.14",
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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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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.17",
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"url": "https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474"
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{
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"url": "https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473"
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"url": "https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853"
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}
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],
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"title": "block: don't revert iter for -EIOCBQUEUED",
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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/msg00028.html"
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"dateUpdated": "2026-10-15T01:04:38.526Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-21832",
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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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{
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:43:12.218426Z"
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}
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],
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"title": "CISA ADP Vulnrichment",
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