nvme-tcp: fix host memory disclosure on R2T for a read command
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix host memory disclosure on R2T for a read command nvme_tcp_handle_r2t() does not check the direction of the request the R2T refers to. A malicious controller can send an R2T for a READ and the host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the H2CData header and nvme_tcp_try_send_data() sends the request's data buffer. That buffer is the READ destination, so its contents go to the controller. The command then completes normally and nothing is logged. Against a test controller that answers every READ with an R2T, a 4096 byte buffered read returned all 4096 bytes, split over two R2Ts. The pages contained stale kernel data, including an array of struct page pointers. Reject an R2T for a request that is not a write.
CVE-2026-89481
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-2026-89481
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": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
"lessThan": "49a4dcf57608ebf6432dbcb203ed25e7ed581445",
"versionType": "git"
},
{
"status": "affected",
"version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
"lessThan": "bc4013c7cce58d46f792c8c87bc8c8318a70190e",
"versionType": "git"
},
{
"status": "affected",
"version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
"lessThan": "a4c3c7310156493797c920b10d8648c07aa05403",
"versionType": "git"
},
{
"status": "affected",
"version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
"lessThan": "3b3d27670c0c890ba7cf1bc3614cab61bde6d25c",
"versionType": "git"
},
{
"status": "affected",
"version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
"lessThan": "3a0b05145053a5fad1a2ddb4e4d87b07385e63e5",
"versionType": "git"
},
{
"status": "affected",
"version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
"lessThan": "6efbc52237facda35d2d874fe1765bb4839275d8",
"versionType": "git"
}
],
"programFiles": [
"drivers/nvme/host/tcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nvme/host/tcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89481
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35009 · Revision 1
- Added to Heist Feed
- Publisher date