Answer in brief
CVE-2025-21832 records a High severity (CVSS 7.8) vulnerability in block: don't revert iter for -EIOCBQUEUED. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.17:rc8:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3e1f941dd9f33776b3df4e30f741fe445ff773f3 <6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb || >=3e1f941dd9f33776b3df4e30f741fe445ff773f3 <84671b0630ccb46ae9f1f99a45c7d63ffcd6a474 || >=3e1f941dd9f33776b3df4e30f741fe445ff773f3 <68f16d3034a06661245ecd22f0d586a8b4e7c473 || >=3e1f941dd9f33776b3df4e30f741fe445ff773f3 <a58f136bad29f9ae721a29d98c042fddbee22f77 || >=3e1f941dd9f33776b3df4e30f741fe445ff773f3 <b13ee668e8280ca5b07f8ce2846b9957a8a10853 | 6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb, 84671b0630ccb46ae9f1f99a45c7d63ffcd6a474, 68f16d3034a06661245ecd22f0d586a8b4e7c473, a58f136bad29f9ae721a29d98c042fddbee22f77, b13ee668e8280ca5b07f8ce2846b9957a8a10853 |
| Linux/Linuxgeneric | 5.17 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Mar 6, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.