CVE-2025-21832

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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't revert for -EIOCBQUEUED, like what is done in other\nspots."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"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's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/fops.c"], "versions": [{"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb", "status": "affected", "versionType": "git"}, {"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "84671b0630ccb46ae9f1f99a45c7d63ffcd6a474", "status": "affected", "versionType": "git"}, {"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "68f16d3034a06661245ecd22f0d586a8b4e7c473", "status": "affected", "versionType": "git"}, {"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "a58f136bad29f9ae721a29d98c042fddbee22f77", "status": "affected", "versionType": "git"}, {"version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "b13ee668e8280ca5b07f8ce2846b9957a8a10853", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/fops.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.129", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.78", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.14", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.3", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.129"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.13.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.14"}]}]}], "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't revert iter for -EIOCBQUEUED", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T21:00:04.401Z"}}, {"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:04:38.526Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-21832", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:43:12.218426Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:51:53.845Z"}}]}}

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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's 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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb", "versionType": "git"}, {"status": "affected", "version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "84671b0630ccb46ae9f1f99a45c7d63ffcd6a474", "versionType": "git"}, {"status": "affected", "version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "68f16d3034a06661245ecd22f0d586a8b4e7c473", "versionType": "git"}, {"status": "affected", "version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "a58f136bad29f9ae721a29d98c042fddbee22f77", "versionType": "git"}, {"status": "affected", "version": "3e1f941dd9f33776b3df4e30f741fe445ff773f3", "lessThan": "b13ee668e8280ca5b07f8ce2846b9957a8a10853", "versionType": "git"}], "programFiles": ["block/fops.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.17"}, {"status": "unaffected", "version": "0", "lessThan": "5.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.129", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.78", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.14", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.3", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["block/fops.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.129", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.78", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.14", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.3", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14", "versionStartIncluding": "5.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:54:48.618Z"}}}, "cveMetadata": {"cveId": "CVE-2025-21832", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:51:53.845Z", "dateReserved": "2024-12-29T08:45:45.777Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-03-06T16:22:34.125Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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't 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. Sea sensato y no revierta para -EIOCBQUEUED, como lo que se hace en otros lugares."}], "id": "CVE-2025-21832", "lastModified": "2026-10-15T22:18:09.777", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21832", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:43:12.218426Z", "version": "2.0.3"}}]}, "published": "2025-03-06T17:15:23.177", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: block: don't revert iter for -EIOCBQUEUED", "id": "2350402", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2350402"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-252", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblock: don't revert iter for -EIOCBQUEUED\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.\nBe sane and don't revert for -EIOCBQUEUED, like what is done in other\nspots."], "name": "CVE-2025-21832", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21832\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21832\nhttps://lore.kernel.org/linux-cve-announce/2025030635-CVE-2025-21832-943e@gregkh/T"], "threat_severity": "Low"}

{}