CVE-2026-98821

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98821", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.372Z", "datePublished": "2026-10-18T15:49:13.154Z", "dateUpdated": "2026-10-19T09:26:14.186Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:26:14.186Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: reject polled dio with user integrity metadata\n\nIOCB_HAS_METADATA leaves iocb->private as a uio_meta, while\niocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I/O\nalways uses __blkdev_direct_IO(), which never publishes the bio for\npolling, so IOPOLL calls bio_poll() on the uio_meta.\n\nReproducer: io_uring IOPOLL plus a PI attribute on an integrity device\n(scsi_debug dif=1 dix=1). KASAN reports:\n\n Oops: general protection fault, probably for non-canonical\n address 0xdffffc0000000004\n KASAN: null-ptr-deref in range\n [0x0000000000000020-0x0000000000000027]\n RIP: 0010:bio_poll+0x9d/0x4b0\n Call Trace:\n iocb_bio_iopoll+0x5b/0x80\n io_uring_classic_poll+0xf3/0x140\n io_do_iopoll+0x4e3/0xc00\n io_iopoll_check+0x275/0x560\n __do_sys_io_uring_enter+0x2e5/0x720\n\nReturn -EOPNOTSUPP when HIPRI is combined with user metadata."}], "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": "2729a60bbfb9215997f25372ebe9b7964f038296", "lessThan": "c97ef13ad96be0e08af38dfa2ed40cded0b53e1b", "status": "affected", "versionType": "git"}, {"version": "2729a60bbfb9215997f25372ebe9b7964f038296", "lessThan": "dd33c03cefccdfcb223e9e6262643d64f8c1ae20", "status": "affected", "versionType": "git"}, {"version": "2729a60bbfb9215997f25372ebe9b7964f038296", "lessThan": "2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e", "status": "affected", "versionType": "git"}, {"version": "17ecefc9fdd8c554e0d03e5a990daef19f930add", "status": "affected", "versionType": "git"}, {"version": "6.16.8", "lessThan": "6.17", "status": "affected", "versionType": "semver"}]}, {"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": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.17", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c97ef13ad96be0e08af38dfa2ed40cded0b53e1b"}, {"url": "https://git.kernel.org/stable/c/dd33c03cefccdfcb223e9e6262643d64f8c1ae20"}, {"url": "https://git.kernel.org/stable/c/2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e"}], "title": "block: reject polled dio with user integrity metadata", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["block/fops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c97ef13ad96be0e08af38dfa2ed40cded0b53e1b", "status": "affected", "version": "2729a60bbfb9215997f25372ebe9b7964f038296", "versionType": "git"}, {"lessThan": "dd33c03cefccdfcb223e9e6262643d64f8c1ae20", "status": "affected", "version": "2729a60bbfb9215997f25372ebe9b7964f038296", "versionType": "git"}, {"lessThan": "2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e", "status": "affected", "version": "2729a60bbfb9215997f25372ebe9b7964f038296", "versionType": "git"}, {"status": "affected", "version": "17ecefc9fdd8c554e0d03e5a990daef19f930add", "versionType": "git"}, {"lessThan": "6.17", "status": "affected", "version": "6.16.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["block/fops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: reject polled dio with user integrity metadata\n\nIOCB_HAS_METADATA leaves iocb->private as a uio_meta, while\niocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I/O\nalways uses __blkdev_direct_IO(), which never publishes the bio for\npolling, so IOPOLL calls bio_poll() on the uio_meta.\n\nReproducer: io_uring IOPOLL plus a PI attribute on an integrity device\n(scsi_debug dif=1 dix=1). KASAN reports:\n\n Oops: general protection fault, probably for non-canonical\n address 0xdffffc0000000004\n KASAN: null-ptr-deref in range\n [0x0000000000000020-0x0000000000000027]\n RIP: 0010:bio_poll+0x9d/0x4b0\n Call Trace:\n iocb_bio_iopoll+0x5b/0x80\n io_uring_classic_poll+0xf3/0x140\n io_do_iopoll+0x4e3/0xc00\n io_iopoll_check+0x275/0x560\n __do_sys_io_uring_enter+0x2e5/0x720\n\nReturn -EOPNOTSUPP when HIPRI is combined with user metadata."}], "id": "CVE-2026-98821", "lastModified": "2026-10-19T10:19:46.173", "metrics": {}, "published": "2026-10-18T16:17:36.337", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c97ef13ad96be0e08af38dfa2ed40cded0b53e1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dd33c03cefccdfcb223e9e6262643d64f8c1ae20"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: block: reject polled dio with user integrity metadata", "id": "2555239", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555239"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-843", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblock: reject polled dio with user integrity metadata\nIOCB_HAS_METADATA leaves iocb->private as a uio_meta, while\niocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I/O\nalways uses __blkdev_direct_IO(), which never publishes the bio for\npolling, so IOPOLL calls bio_poll() on the uio_meta.\nReproducer: io_uring IOPOLL plus a PI attribute on an integrity device\n(scsi_debug dif=1 dix=1). KASAN reports:\nOops: general protection fault, probably for non-canonical\naddress 0xdffffc0000000004\nKASAN: null-ptr-deref in range\n[0x0000000000000020-0x0000000000000027]\nRIP: 0010:bio_poll+0x9d/0x4b0\nCall Trace:\niocb_bio_iopoll+0x5b/0x80\nio_uring_classic_poll+0xf3/0x140\nio_do_iopoll+0x4e3/0xc00\nio_iopoll_check+0x275/0x560\n__do_sys_io_uring_enter+0x2e5/0x720\nReturn -EOPNOTSUPP when HIPRI is combined with user metadata.", "A flaw was found in the Linux kernel's block layer. A local user could exploit this vulnerability to cause a denial of service (DoS) by initiating polled direct I/O operations combined with user integrity metadata. Because the kernel improperly attempts to poll integrity metadata as standard block I/O request structures, an invalid pointer dereference occurs, resulting in a system crash."], "name": "CVE-2026-98821", "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": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98821\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98821\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98821.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2729a60bbfb9215997f25372ebe9b7964f038296,c97ef13ad96be0e08af38dfa2ed40cded0b53e1b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2729a60bbfb9215997f25372ebe9b7964f038296,dd33c03cefccdfcb223e9e6262643d64f8c1ae20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2729a60bbfb9215997f25372ebe9b7964f038296,2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "17ecefc9fdd8c554e0d03f5a990daef19f930add"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.16.8,6.17)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.56,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.10,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-18T22:00:20.104769+00:00", "title": "Kernel Crash Triggered by io_uring IOPOLL with Integrity Metadata", "updated": "2026-10-24T01:45:17.364784+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476", "CWE-704", "CWE-843"]}