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Fencer Vulns
high 7.5

CVE-2026-31467 json

erofs: add GFP_NOIO in the bio completion if needed

published 2026-04-22 6 mo ago modified 2026-08-05 3 mo ago also EUVD-2026-24814

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

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

erofs: add GFP_NOIO in the bio completion if needed

The bio completion path in the process context (e.g. dm-verity) will directly call into decompression rather than trigger another workqueue context for minimal scheduling latencies, which can then call vm_map_ram() with GFP_KERNEL.

Due to insufficient memory, vm_map_ram() may generate memory swapping I/O, which can cause submit_bio_wait to deadlock in some scenarios.

Trimmed down the call stack, as follows:

f2fs_submit_read_io submit_bio //bio_list is initialized. mmc_blk_mq_recovery z_erofs_endio vm_map_ram __pte_alloc_kernel __alloc_pages_direct_reclaim shrink_folio_list __swap_writepage submit_bio_wait //bio_list is non-NULL, hang!!!

Use memalloc_noio_{save,restore}() to wrap up this path.

Patch / fix

  • Linux Linux 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11, 7.0
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.11-1

debian advisories DEBIAN-CVE-2026-31467

  • linux Ubuntu 22.04 LTS 5.15.0-186.196
  • linux Ubuntu 24.04 LTS 6.8.0-136.136
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1112.119
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1061.64
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1112.122
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1064.72
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1108.114
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1059.67

ubuntu advisories UBUNTU-CVE-2026-31467

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 RHEL 10.2 6.12.0-211.22.1.el10_2
  • rv RHEL 10.2 6.12.0-211.22.1.el10_2
  • perf RHEL 10.2 6.12.0-211.22.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.22.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.22.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.22.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.22.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.22.1.el10_2

red hat advisories RHSA-2026:75560RHSA-2026:25191

  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.37.1
  • kernel-rt Linux Micro 6.2 6.12.0-160000.37.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1.160000.2.19
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-azure SLES 16.0, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-obs-qa SLES 16.0, SLES for SAP applications 16.0 6.12.0-160000.37.1

suse advisories SUSE-SU-2026:23237-1SUSE-SU-2026:23068-1SUSE-SU-2026:23221-1SUSE-SU-2026:23231-1SUSE-SU-2026:23066-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1

  • kernel AlmaLinux 10 6.12.0-211.22.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.22.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.22.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.22.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.22.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.22.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.22.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.22.1.el10_2

almalinux advisories ALSA-2026:25191

  • kernel Rocky Linux 10 6.12.0-211.22.1.el10_2

rocky linux advisories RLSA-2026:25191

  • kernel Azure Linux 3.0 6.6.134.1-2

azure linux advisories AZL-83363

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-31467 updated cvss 5.5

kernel: Linux kernel: Denial of Service in erofs filesystem

  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.22.1.el10_2, perf 6.12.0-211.22.1.el10_2, rtla 6.12.0-211.22.1.el10_2, python3-perf 6.12.0-211.22.1.el10_2, kernel-devel-matched 6.12.0-211.22.1.el10_2, kernel-64k-devel-matched 6.12.0-211.22.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:25191
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.108.1.el10_0, perf 6.12.0-55.108.1.el10_0, rtla 6.12.0-55.108.1.el10_0, python3-perf 6.12.0-55.108.1.el10_0, kernel-devel-matched 6.12.0-55.108.1.el10_0, kernel-64k-devel-matched 6.12.0-55.108.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:75560
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.22.1.el10_2, kernel-64k 6.12.0-211.22.1.el10_2, kernel-core 6.12.0-211.22.1.el10_2, kernel-tools 6.12.0-211.22.1.el10_2, kernel-modules 6.12.0-211.22.1.el10_2, kernel-64k-core 6.12.0-211.22.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:25191
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.108.1.el10_0, kernel-64k 6.12.0-55.108.1.el10_0, kernel-core 6.12.0-55.108.1.el10_0, kernel-tools 6.12.0-55.108.1.el10_0, kernel-modules 6.12.0-55.108.1.el10_0, kernel-64k-core 6.12.0-55.108.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:75560
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.22.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.22.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.22.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.22.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.22.1.el10_2
    fixed: vendor fix RHSA-2026:25191
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.108.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.108.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.108.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.108.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.108.1.el10_0
    fixed: vendor fix RHSA-2026:75560
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.22.1.el10_2, kernel-rt-64k 6.12.0-211.22.1.el10_2, kernel-rt-core 6.12.0-211.22.1.el10_2, kernel-rt-modules 6.12.0-211.22.1.el10_2, kernel-rt-64k-core 6.12.0-211.22.1.el10_2, kernel-rt-debug-core 6.12.0-211.22.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:25191
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.108.1.el10_0, kernel-rt-64k 6.12.0-55.108.1.el10_0, kernel-rt-core 6.12.0-55.108.1.el10_0, kernel-rt-modules 6.12.0-55.108.1.el10_0, kernel-rt-64k-core 6.12.0-55.108.1.el10_0, kernel-rt-debug-core 6.12.0-55.108.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:75560
show 3 more
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.22.1.el10_2, kernel-rt-core 6.12.0-211.22.1.el10_2, kernel-rt-modules 6.12.0-211.22.1.el10_2, kernel-rt-debug-core 6.12.0-211.22.1.el10_2, kernel-rt-modules-core 6.12.0-211.22.1.el10_2, kernel-rt-debug-modules 6.12.0-211.22.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:25191
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.108.1.el10_0, kernel-rt-kvm 6.12.0-55.108.1.el10_0, kernel-rt-core 6.12.0-55.108.1.el10_0, kernel-rt-modules 6.12.0-55.108.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.108.1.el10_0, kernel-rt-debug-core 6.12.0-55.108.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:75560
  • 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
    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

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.