CVE-2026-89481High· 7.5▾ TwilightIn 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 control…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7.4
none → high
— → 7.4
none → high
— → 7.5
none → high
7.5 → 7.4
7.4 → 7.5
7.5 → 7
0.2% → 0.6%
7 → 7.1
7.1 → 7.5
Last analysed / modified upstream
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.
Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 49a4dcf57608ebf6432dbcb203ed25e7ed581445Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < bc4013c7cce58d46f792c8c87bc8c8318a70190eLinux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < a4c3c7310156493797c920b10d8648c07aa05403Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 3b3d27670c0c890ba7cf1bc3614cab61bde6d25cLinux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 6efbc52237facda35d2d874fe1765bb4839275d8Linux 5.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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