scsi: libiscsi_tcp: Check the data direction of a Data-In PDU
In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi_tcp: Check the data direction of a Data-In PDU The Data-In branch of iscsi_tcp_hdr_dissect() resolves the ITT to a task and copies the PDU's data segment into that command's scatterlist without asking whether the command was reading. iscsi_tcp_r2t_rsp() in the same file does ask, and rejects an R2T for a command that is not DMA_TO_DEVICE. A target that answers a WRITE command's ITT with a Data-In therefore has the initiator write target-supplied bytes into the pages that write was about to send. Those are the caller's own pinned pages for an O_DIRECT write, and page cache pages for a buffered one. Observed against a test target that emits one 512-byte Data-In naming a 128 KB write's ITT, after the R2T for that write. With O_DIRECT the caller's buffer ends up holding 512 bytes of the target's data while pwrite() returns 131072. Buffered is quieter: pwrite() and fsync() both succeed, nothing is logged, and reading those blocks back returns the target's bytes out of the page cache without a command going on the wire. Check the direction before using the scatterlist, the way the R2T path already does.
CVE-2026-98479
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-2026-98479
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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "79991b770fc3685b1d5cf805b659a879edd19931",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "8db1232945bc663fb94f300090a1fc108de99296",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "94e5bdd08e51c450d954bc592f591c233ca5c9df",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "de96dc11aee0d058927bff94a168e3c5c46483e2",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "e3b25bf2cf2496e85bc05b33360faf9fdf880e03",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "ee56b5e18f566c0b5a183379dcd63d402cebf2f8",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "24ffc919467d20951f0f132d1c75294e2e91e09b",
"versionType": "git"
},
{
"status": "affected",
"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
"lessThan": "bce07e2f37b5e4a427d36fd6b1c14067b27591db",
"versionType": "git"
}
],
"programFiles": [
"drivers/scsi/libiscsi_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": "2.6.29"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.29",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/scsi/libiscsi_tcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98479
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #55600 · Revision 1
- Added to Heist Feed
- Publisher date