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NVD / CVE Program· CNA Linux

CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place

HighCVSS 7.8 · v3.1KEVWeaponized Fix available

Noroxi assessment

Priority: Now (action score 90/100)

  • CISA has confirmed exploitation in the wild (May 1, 2026). Remediation deadline for US federal agencies: May 15, 2026.
  • A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 98.1% (FIRST EPSS); higher than 99.9% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 19d43105a97be0810edbda875f2cd03f30dc130c, 3115af9644c342b356f3f07a4dd1c8905cd9a6fc, 893d22e0135fa394db81df88697fba6032747667; azl3 kernel 6.6.134.1-2 on Azure Linux 3.0 6.6.137.1-1; azl3 kernel-hwe 0:6.12-1 on Azure Linux 3.0 6.12.85.1-1.

Patch today or shut off access. Upgrade to Linux Linux 19d43105a97be0810edbda875f2cd03f30dc130c, 3115af9644c342b356f3f07a4dd1c8905cd9a6fc, 893d22e0135fa394db81df88697fba6032747667; azl3 kernel 6.6.134.1-2 on Azure Linux 3.0 6.6.137.1-1; azl3 kernel-hwe 0:6.12-1 on Azure Linux 3.0 6.12.85.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Published
Apr 22, 2026
Updated
Nov 11, 2026
EPSS
98.1% · 99th percentile

Report tools

JSON

Action score

90

Now

Patch today or shut off access.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
29 / 30 · 98.1%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on May 1, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: May 15, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-31431

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatopenshift container platform
redhatenterprise linux
redhatenterprise linux aus
redhatenterprise linux eus
redhatenterprise linux tus
redhatenterprise linux update services for sap solutions
amazonamazon linux
canonicalubuntu linux
debiandebian linux
opensuseleap
susecaas platform

and 48 more

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.14affected
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before 893d22e0135fa394db81df88697fba6032747667affected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before 19d43105a97be0810edbda875f2cd03f30dc130caffected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before 961cfa271a918ad4ae452420e7c303149002875baffected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before 3115af9644c342b356f3f07a4dd1c8905cd9a6fcaffected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before 8b88d99341f139e23bdeb1027a2a3ae10d341d82affected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8affected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before ce42ee423e58dffa5ec03524054c9d8bfd4f6237affected · git
    • 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and later · before a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5affected · git
    • before 4.14not affected · semver
Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • amazon amazon linuxall versions
  • arista cloudvision agni2024.4.0 and later · up to 2025.2.2 inclusive
  • arista cloudvision portal2024.2.0 and later · up to 2026.1.0 inclusive
  • arista netvisor osbefore 7.1.0
  • arista netvisor os7.1.0
  • arista velocloud edge4.5.0 and later · up to 6.4.1 inclusive
  • arista velocloud gatewayall versions
  • arista velocloud orchestratorall versions
  • canonical ubuntu linuxall versions
  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux20.04
  • canonical ubuntu linux22.04
  • canonical ubuntu linux24.04
  • canonical ubuntu linux25.10
  • debian debian linux11.0
  • debian debian linux12.0
  • debian debian linux13.0
  • linux linux kernel4.14 and later · before 5.10.254

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernelbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64kbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64kbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-modules-internalbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-modules-partnerbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-uki-virtbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1
AlmaLinux:10kernel-64k-debug-uki-virt-addonsbefore 6.12.0-124.52.2.el10_16.12.0-124.52.2.el10_1

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect…KEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31429Apr 20, 2026 · net: skb: fix cross-cache free of KFENCE-allocated skb head
    22Monitor
  • ← EarlierCVE-2026-31430Apr 20, 2026 · X.509: Fix out-of-bounds access when parsing extensions
    28Monitor
  • Later →CVE-2026-31432Apr 22, 2026 · ksmbd: fix OOB write in QUERY_INFO for compound requests
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux19d43105a97be0810edbda875f2cd03f30dc130cVendor (CNA)
Linux Linux3115af9644c342b356f3f07a4dd1c8905cd9a6fcVendor (CNA)
Linux Linux893d22e0135fa394db81df88697fba6032747667Vendor (CNA)
Linux Linux8b88d99341f139e23bdeb1027a2a3ae10d341d82Vendor (CNA)
Linux Linux961cfa271a918ad4ae452420e7c303149002875bVendor (CNA)
Linux Linuxa664bf3d603dc3bdcf9ae47cc21e0daec706d7a5Vendor (CNA)
Linux Linuxce42ee423e58dffa5ec03524054c9d8bfd4f6237Vendor (CNA)
Linux Linuxfafe0fa2995a0f7073c1c358d7d3145bcc9aedd8Vendor (CNA)
azl3 kernel 6.6.134.1-2 on Azure Linux 3.06.6.137.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel-hwe 0:6.12-1 on Azure Linux 3.06.12.85.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
almalinux:kernel5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-611.54.1.el9_7 · AlmaLinux:9Package registry (OSV)
alpine:docker29.4.2-r0 · Alpine:v3.23Package registry (OSV)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)
opensuse:docker29.7.2_ce-41.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:systemtap5.5-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-611.54.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-611.54.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-611.54.1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+24

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×50

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHub50 repositories2026-03-08 → 2026-04-30
Metasploit moduleexploit/linux/local/cve_2026_31431_copy_failCopy Fail AF_ALG + authencesn Page-Cache Writeexploit2026-04-29
Nuclei detection templateNuclei template CVE-2026-31431 —

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-45 d
  2. Published
  3. Metasploit+7 d
  4. CISA KEV+9 d
  5. TodayNov 14, 2026+206 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-98125156 days apartsmb/client: fix stale page cache in insert/collapse range
    22Monitor

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: patch commit or PR link · researcher credit.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-669 · Incorrect Resource Transfer Between Spheres

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records