CVE-2026-98821
Status: ReceivedUnscored—
Severity—Unscored
Exploitation probability0.17 %higher than 5% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found
In the Linux kernel, the following vulnerability has been resolved:
block: reject polled dio with user integrity metadata
IOCB_HAS_METADATA leaves iocb->private as a uio_meta, while iocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I/O always uses __blkdev_direct_IO(), which never publishes the bio for polling, so IOPOLL calls bio_poll() on the uio_meta.
Reproducer: io_uring IOPOLL plus a PI attribute on an integrity device (scsi_debug dif=1 dix=1). KASAN reports:
Return -EOPNOTSUPP when HIPRI is combined with user metadata.
Technical details traces, logs and code from the original report
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004 KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] RIP: 0010:bio_poll+0x9d/0x4b0 Call Trace: iocb_bio_iopoll+0x5b/0x80 io_uring_classic_poll+0xf3/0x140 io_do_iopoll+0x4e3/0xc00 io_iopoll_check+0x275/0x560 __do_sys_io_uring_enter+0x2e5/0x720
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.17 %
- Percentile among all scored CVEs
- 5
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
Raw JSON (NVD)
Show
{
"id": "CVE-2026-98821",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2729a60bbfb9215997f25372ebe9b7964f038296",
"lessThan": "c97ef13ad96be0e08af38dfa2ed40cded0b53e1b",
"versionType": "git"
},
{
"status": "affected",
"version": "2729a60bbfb9215997f25372ebe9b7964f038296",
"lessThan": "dd33c03cefccdfcb223e9e6262643d64f8c1ae20",
"versionType": "git"
},
{
"status": "affected",
"version": "2729a60bbfb9215997f25372ebe9b7964f038296",
"lessThan": "2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e",
"versionType": "git"
},
{
"status": "affected",
"version": "17ecefc9fdd8c554e0d03e5a990daef19f930add",
"versionType": "git"
},
{
"status": "affected",
"version": "6.16.8",
"lessThan": "6.17",
"versionType": "semver"
}
],
"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": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"block/fops.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:36.337",
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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."
}
],
"lastModified": "2026-10-19T10:19:46.173",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}