{"id":"CVE-2025-21832","title":"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…","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-252"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.17.1, < 6.1.129","linux_kernel >= 6.2, < 6.6.78","linux_kernel >= 6.7, < 6.12.14","linux_kernel >= 6.13, < 6.13.3","linux_kernel = 5.17"],"patched":["linux_kernel 6.13.3"],"published":"2025-03-06","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:18:09.777","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-21832","references":[{"url":"https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21832.json"},{"url":"https://access.redhat.com/security/cve/CVE-2025-21832"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2350402"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-21832"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21832"},{"url":"https://lore.kernel.org/linux-cve-announce/2025030635-CVE-2025-21832-943e@gregkh/T"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00191,"epssPercentile":0.08725,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:43:12.218426Z"},"scores":{"nvd":7.8,"vendor":4.4},"ingestedAt":"2026-07-30T06:53:10.380Z","slug":"CVE-2025-21832","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 5.17.1, < 6.1.129`\n- `linux_kernel >= 6.2, < 6.6.78`\n- `linux_kernel >= 6.7, < 6.12.14`\n- `linux_kernel >= 6.13, < 6.13.3`\n- `linux_kernel = 5.17`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.13.3`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21832.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}