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CVE Record

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

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.

HighCVSS 7.8Known exploitedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux kernel authenticated-encryption handling can let a low-privileged local attacker cause severe confidentiality, integrity, and availability impact. It is not presented as a remote attack, but CISA KEV inclusion makes exposed multi-user Linux systems urgent patching candidates.

Executive priority

Treat this as a high-priority kernel remediation because exploitation is acknowledged through CISA KEV and public exploit material exists. Prioritize systems where untrusted users, compromised services, or tenants can execute locally. Emergency remote-service shutdown is not justified by the supplied local attack vector alone.

Technical view

The vulnerable algif_aead implementation attempted unnecessary in-place processing even though source and destination use different mappings. Linux resolved the issue by reverting that behavior, restoring out-of-place operation, and directly copying associated data. The supplied CVSS 3.1 score is 7.8 with local, low-complexity, low-privilege attack requirements and no user interaction.

Likely exposure

Systems are candidates when their running Linux kernel contains the affected algif_aead behavior but lacks the applicable stable or distribution backport. Internet exposure alone does not establish vulnerability because the vector is local. The supplied version data is insufficiently clear for reliable version-string-only decisions.

Exploitation context

CISA KEV status supports known exploitation in the wild. The bundle also identifies a public exploit repository, increasing practical risk. Exploitation requires local low-privileged access according to the supplied CVSS vector; the sources do not establish a remotely reachable attack path.

Researcher notes

Exact affected-version boundaries are ambiguous in the supplied normalized data. Validate exposure through distribution advisories and fix-commit ancestry. Relevant stable fixes are represented by multiple kernel.org commits. The sources establish the implementation change and high-impact local vector, but this bundle does not provide enough detail to independently characterize every exploitation primitive or indicator.

Mitigation direction

  • Install the vendor kernel update containing the applicable algif_aead fix.
  • Reboot into the updated kernel; installing a package alone may leave the vulnerable kernel running.
  • Prioritize shared, multi-user, container-hosting, and externally accessible systems offering local account paths.
  • If immediate updating is impossible, follow the Linux distributor's documented mitigation guidance.

Validation and detection

  • Record the running kernel build and distribution package revision on every Linux asset.
  • Check vendor advisories for whether that exact package includes the applicable stable fix.
  • Verify the running kernel changed after reboot and matches the remediated package.
  • Confirm scanners use distribution backport data, not upstream version comparisons alone.
  • Review affected hosts for unexplained privilege changes or integrity events during the exposure window.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-1288: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-669: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-31431 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
Yes
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
4ADP providers
59Source links

CISA KEV status

Status
Known exploited
Source
CISA-ADP
Date added
KEV reference

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: activeAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-31431Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Reported to Red Hat.

  3. ADP timelineredhat-SADP

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. Added to KEVCISA-ADP

    CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.

  6. ADP timelineCISA-ADP

    CVE-2026-31431 added to CISA KEV

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvcother:kev
  • 2026-05-01T00:00:00.000Z: CVE-2026-31431 added to CISA KEV
CVECVE Program Container
siemens-SADPADP container
redhat-SADPkernel: crypto: algif_aead - Revert to operating out-of-place
other:Red Hat severity ratingcvssV3_1
  • 2026-04-22T00:00:00.000Z: Reported to Red Hat.
  • 2026-04-22T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7unaffected
LinuxLinux4.14, 0, 5.10.254, 5.15.204, 6.1.170, 6.6.137, 6.12.85, 6.18.22, 6.19.12, 7.0affected
Weakness

CWE details

CWE-1288CWE-669

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.