CVE-2026-89481
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3f2304f8c6d6ed97849057bd16fee99e434ca796 | affected | git | 49a4dcf57608ebf6432dbcb203ed25e7ed581445 | Unavailable | None listed |
| 3f2304f8c6d6ed97849057bd16fee99e434ca796 | affected | git | bc4013c7cce58d46f792c8c87bc8c8318a70190e | Unavailable | None listed |
| 3f2304f8c6d6ed97849057bd16fee99e434ca796 | affected | git | a4c3c7310156493797c920b10d8648c07aa05403 | Unavailable | None listed |
| 3f2304f8c6d6ed97849057bd16fee99e434ca796 | affected | git | 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c | Unavailable | None listed |
| 3f2304f8c6d6ed97849057bd16fee99e434ca796 | affected | git | 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5 | Unavailable | None listed |
| 3f2304f8c6d6ed97849057bd16fee99e434ca796 | affected | git | 6efbc52237facda35d2d874fe1765bb4839275d8 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.0 | Unavailable | None listed |
| 6.1.188 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.109 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.50 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.4 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |