7.5

CVE-2026-89481: linux

CVSS: 7.5v3.1HighReceived
AliasesUBUNTU-CVE-2026-89481DEBIAN-CVE-2026-89481
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-89481 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 5
OPENSUSE-SU-2026:11880-1OPENSUSE-SU-2026:22091-1RHSA-2026:71602RHSA-2026:75746RHSA-2026:75747RHSA-2026:76739

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

0.00 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu165 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 49a4dcf57608ebf6432dbcb203ed25e7ed581445 | ≥ 3f2304f8c6d6ed97849057bd16fee99e434ca796, < bc4013c7cce58d46f792c8c87bc8c8318a70190e | ≥ 3f2304f8c6d6ed97849057bd16fee99e434ca796, < a4c3c7310156493797c920b10d8648c07aa05403 | ≥ 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c | ≥ 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5 | ≥ 3f2304f8c6d6ed97849057bd16fee99e434ca796, < 6efbc52237facda35d2d874fe1765bb4839275d8 | 5.0

3 vendors · 168 products

References

11 links
Show all 11 references