ublk: validate auto buf reg before taking uring_cmd
In the Linux kernel, the following vulnerability has been resolved: ublk: validate auto buf reg before taking uring_cmd With UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after ublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE. The uring_cmd is completed while the tag stays active, which can hang teardown. Split validation from buffer apply so the check has no side effects, then take the uring_cmd and store the already-validated buffer. Apply the same order in FETCH so io->buf is not written before __ublk_fetch() state checks.
CVE-2026-90323
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-2026-90323
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": "52460dda3a775a73f226312b43c0a0211e8665ea",
"lessThan": "8397942b67128e0b1275cfedb5abf4faafac5fd0",
"versionType": "git"
},
{
"status": "affected",
"version": "52460dda3a775a73f226312b43c0a0211e8665ea",
"lessThan": "653d22269a8b83b491f7f186a5d7872f14e6ddca",
"versionType": "git"
},
{
"status": "affected",
"version": "52460dda3a775a73f226312b43c0a0211e8665ea",
"lessThan": "ca5a01eee34c7cbe0f531a613b0292a3ad1a419b",
"versionType": "git"
}
],
"programFiles": [
"drivers/block/ublk_drv.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": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/block/ublk_drv.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90323
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36671 · Revision 1
- Added to Heist Feed
- Publisher date