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Fencer Vulns
no cvss —

CVE-2026-90384 json

iomap: release the folio batch on iomap callback failures

published 2026-09-17 52 d ago modified 2026-10-19 21 d ago also EUVD-2026-82045

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

iomap: release the folio batch on iomap callback failures

A sashiko review of an unrelated patch points out that the folio batch mechanism used for iomap zero range fails to release the batch in a couple error scenarios. If either calls to ->iomap_end() or ->iomap_begin() fail, the direct return paths bypass the batch cleanup.

The ->iomap_end() case is not a practical issue at the moment because there is no user of the mechanism that returns an error from this path. The ->iomap_begin() case is theoretically possible because XFS can invoke the fill helper and error out at various points thereafter. This subtly complicates things because XFS does not transfer iomap_flags to the iomap data structure in the error path.

To deal with both of these issues, first make sure to invoke the cleanup helper in the error path for either fs callback. Second, update the helper to clear the flag unconditionally and release the batch so long as it is populated. This more clearly delineates the purpose of the flag to control the I/O path and not necessarily the status of the fbatch, so add a comment around this as well.

Patch / fix

  • Linux Linux 7.2.6, 7.3
  • linux Debian 14 7.2.6-1

debian advisories DEBIAN-CVE-2026-90384

  • linux Ubuntu 26.04 LTS 7.0.0-42.42
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1016.18
  • linux-ibm Ubuntu 26.04 LTS 7.0.0-1017.17
  • linux-riscv Ubuntu 26.04 LTS 7.0.0-42.42.1
  • linux-oracle Ubuntu 26.04 LTS 7.0.0-1015.16
  • linux-hwe-7.0 Ubuntu 24.04 LTS 7.0.0-42.42~24.04.1
  • linux-oem-7.0 Ubuntu 26.04 LTS 7.0.0-1017.17

ubuntu advisories UBUNTU-CVE-2026-90384

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-source openSUSE Tumbleweed 7.2.8-1.1

opensuse advisories openSUSE-SU-2026:11893-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-90384 updated cvss 5.5

kernel: iomap: release the folio batch on iomap callback failures

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

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