Vulnerability-Lookup

FKIE_CVE-2025-21832

Vulnerability from fkie_nvd - Published: 2025-03-06 17:15 - Updated: 2026-07-30 06:21

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: block: don't revert iter for -EIOCBQUEUED blkdev_read_iter() has a few odd checks, like gating the position and count adjustment on whether or not the result is bigger-than-or-equal to zero (where bigger than makes more sense), and not checking the return value of blkdev_direct_IO() before doing an iov_iter_revert(). The latter can lead to attempting to revert with a negative value, which when passed to iov_iter_revert() as an unsigned value will lead to throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT. Be sane and don't revert for -EIOCBQUEUED, like what is done in other spots.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.17
linux	linux_kernel	5.17
linux	linux_kernel	5.17
linux	linux_kernel	5.17
linux	linux_kernel	5.17
linux	linux_kernel	5.17
linux	linux_kernel	5.17

JSON

To clipboard

{
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    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: no revertir iter para -EIOCBQUEUED blkdev_read_iter() tiene algunas comprobaciones extra\u00f1as, como bloquear el ajuste de posici\u00f3n y conteo en funci\u00f3n de si el resultado es o no mayor o igual a cero (donde mayor que tiene m\u00e1s sentido), y no verificar el valor de retorno de blkdev_direct_IO() antes de hacer un iov_iter_revert(). Esto \u00faltimo puede llevar a intentar revertir con un valor negativo, que cuando se pasa a iov_iter_revert() como un valor sin signo conducir\u00e1 a lanzar un WARN_ON() porque unroll es mayor que MAX_RW_COUNT. Sea sensato y no revierta para -EIOCBQUEUED, como lo que se hace en otros lugares."
    }
  ],
  "id": "CVE-2025-21832",
  "lastModified": "2026-07-30T06:21:40.167",
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        "cvssData": {
          "attackComplexity": "LOW",
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}

CVE-2025-21832 (GCVE-0-2025-21832)

Vulnerability from cvelistv5 – Published: 2025-03-06 16:22 – Updated: 2026-08-05 11:54

Title

block: don't revert iter for -EIOCBQUEUED

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/6c26619effb1b4cb7…
https://git.kernel.org/stable/c/84671b0630ccb46ae…
https://git.kernel.org/stable/c/68f16d3034a066612…
https://git.kernel.org/stable/c/a58f136bad29f9ae7…
https://git.kernel.org/stable/c/b13ee668e8280ca5b…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < 6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < 84671b0630ccb46ae9f1f99a45c7d63ffcd6a474 (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < 68f16d3034a06661245ecd22f0d586a8b4e7c473 (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < a58f136bad29f9ae721a29d98c042fddbee22f77 (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < b13ee668e8280ca5b07f8ce2846b9957a8a10853 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.129 , ≤ 6.1.* (semver) Unaffected: 6.6.78 , ≤ 6.6.* (semver) Unaffected: 6.12.14 , ≤ 6.12.* (semver) Unaffected: 6.13.3 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T21:00:04.401Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "product": "Linux",
          "programFiles": [
            "block/fops.c"
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            {
              "lang": "en",
              "value": "AV:L - The bug is reached through local syscalls only \u2014 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 \u2014 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\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free \u2014 `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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:54:48.618Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb"
        },
        {
          "url": "https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474"
        },
        {
          "url": "https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473"
        },
        {
          "url": "https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77"
        },
        {
          "url": "https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853"
        }
      ],
      "title": "block: don\u0027t revert iter for -EIOCBQUEUED",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21832",
    "datePublished": "2025-03-06T16:22:34.125Z",
    "dateReserved": "2024-12-29T08:45:45.777Z",
    "dateUpdated": "2026-08-05T11:54:48.618Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2025-21832

CVE-2025-21832 (GCVE-0-2025-21832)

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