Strix
64.5K

CVE-2026-89481

HIGHCVSS 7.5/10EPSS 0.38%

Last modified

CVE-2026-89481 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability
0.38%

31.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 49a4dcf57608ebf6432dbcb203ed25e7ed581445; >= 3f2304f8c6d6ed97849057bd16fee99e434ca796, < bc4013c7cce58d46f792c8c87bc8c8318a70190e; >= 3f2304f8c6d6ed97849057bd16fee99e434ca796, < a4c3c7310156493797c920b10d8648c07aa05403; >= 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c; >= 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5; >= 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 6efbc52237facda35d2d874fe1765bb4839275d8
LinuxLinux5.0

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89481?
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.
How severe is CVE-2026-89481?
CVE-2026-89481 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89481?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-89481?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST