CVE-2026-89481nvme-tcp: fix host memory disclosure on R2T for a read command
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 49a4dcf57608ebf6432dbcb203ed25e7ed581445; from 3f2304f8c6d6ed97849057bd16fee99e434ca796 before bc4013c7cce58d46f792c8c87bc8c8318a70190e; from 3f2304f8c6d6ed97849057bd16fee99e434ca796 before a4c3c7310156493797c920b10d8648c07aa05403; 3f2304f8c6d6ed97849057bd16fee99e434ca796 builds before 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c; 3f2304f8c6d6ed97849057bd16fee99e434ca796 builds before 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5; from 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 6efbc52237facda35d2d874fe1765bb4839275d8 | CNA record |
References
- https://git.kernel.org/stable/c/49a4dcf57608ebf6432dbcb203ed25e7ed581445
- https://git.kernel.org/stable/c/bc4013c7cce58d46f792c8c87bc8c8318a70190e
- https://git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403
- https://git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c
- https://git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5
- https://git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.