CVE-2025-21832 (GCVE-0-2025-21832)
Vulnerability from cvelistv5 – Published: 2025-03-06 16:22 – Updated: 2026-08-05 11:54
VLAI
EPSS
VEX
Title
block: don't revert iter for -EIOCBQUEUED
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.
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < 6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb
(git)
Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < 84671b0630ccb46ae9f1f99a45c7d63ffcd6a474 (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < 68f16d3034a06661245ecd22f0d586a8b4e7c473 (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < a58f136bad29f9ae721a29d98c042fddbee22f77 (git) Affected: 3e1f941dd9f33776b3df4e30f741fe445ff773f3 , < b13ee668e8280ca5b07f8ce2846b9957a8a10853 (git) |
guessed | |
| 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) |
guessed |
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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\u0027t revert for -EIOCBQUEUED, like what is done in other\\nspots.\"},{\"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. 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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-07-30T10:13:30+00:00",
"cve": "CVE-2025-21832",
"id": "CVE-2025-21832",
"initial_release_date": "2025-03-06T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: block: don\u0027t revert iter for -EIOCBQUEUED",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21832.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-12T16:52:31Z",
"cve": "CVE-2025-21832",
"id": "CVE-2025-21832",
"initial_release_date": "2025-03-07T02:37:05Z",
"product_status:known_affected": "479",
"product_status:known_not_affected": "327",
"product_status:recommended": "384",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-21832",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21832.json",
"version": "49"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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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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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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