scsi: libiscsi_tcp: Check the data direction of a Data-In PDU

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98479
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:16:58 UTC
Updated2026-10-19 10:18:58 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff 79991b770fc3685b1d5cf805b659a879edd19931 git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff 8db1232945bc663fb94f300090a1fc108de99296 git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff 94e5bdd08e51c450d954bc592f591c233ca5c9df git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff de96dc11aee0d058927bff94a168e3c5c46483e2 git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff e3b25bf2cf2496e85bc05b33360faf9fdf880e03 git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff ee56b5e18f566c0b5a183379dcd63d402cebf2f8 git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff 24ffc919467d20951f0f132d1c75294e2e91e09b git Not specified
CNA Linux Linux affected a081c13e39b5c17052a7b46fafa61019c4c110ff bce07e2f37b5e4a427d36fd6b1c14067b27591db git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/24ffc919467d20951f0f132d1c75294e2e91e09b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8db1232945bc663fb94f300090a1fc108de99296 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e3b25bf2cf2496e85bc05b33360faf9fdf880e03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de96dc11aee0d058927bff94a168e3c5c46483e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79991b770fc3685b1d5cf805b659a879edd19931 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee56b5e18f566c0b5a183379dcd63d402cebf2f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bce07e2f37b5e4a427d36fd6b1c14067b27591db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94e5bdd08e51c450d954bc592f591c233ca5c9df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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