block: reject polled dio with user integrity metadata
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: 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 Return -EOPNOTSUPP when HIPRI is combined with user metadata.
CVE-2026-98821
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98821
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-98821
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38738 · Revision 1
- Added to Heist Feed
- Publisher date