What is CVE-2026-31431?

CVE-2026-31431 is crypto: algif_aead - Revert to operating out-of-place. The supplied enrichment data classifies it as Remote Code Exec mapped to CWE-669 CWE-669; CWE-1288 CWE-1288.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Yes: CISA KEV signal present. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

Is there a public exploit?

793 public PoC repositories reported; 0 marked weaponized in current dataset. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with EDR process telemetry, host service logs where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2026-31431 using CVSS 7.8, EPSS 100%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Treat as emergency remediation because CISA KEV status is present. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

CISA KEVhighRemote Code Execpublic exploit

CVE-2026-31431

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

Q: Is it in CISA KEV?

Yes. The supplied enrichment data lists CVE-2026-31431 in CISA KEV with required action: "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

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, 2026Updated Jul 15, 2026Sources: NVD, Linux (CNA), CISA, FIRST EPSS, GitHub, GitHub Security Advisory

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Confirmed

CISA KEV, listed May 1, 2026

EPSS

100%

top of FIRST's scoreset

Affects

Linux

18 products listed

CVSS base

7.8

high

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

Active

none · proof-of-concept · active

Automatable

can an attacker script all four kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

The vendor's own words where we have them.

Upgrade Linux to a fixed release (0 to < 4.14). Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

CISA required action

"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Federal deadline May 15, 2026 — passed 105 days ago

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Treat as emergency remediation because CISA KEV status is present.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7 to < 893d22e0135fa394db81df88697fba6032747667	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7 to < 19d43105a97be0810edbda875f2cd03f30dc130c	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7 to < 961cfa271a918ad4ae452420e7c303149002875b	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7 to < 3115af9644c342b356f3f07a4dd1c8905cd9a6fc	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7 to < 8b88d99341f139e23bdeb1027a2a3ae10d341d82	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7	Vulnerable
Linux	Linux	72548b093ee38a6d4f2a19e6ef1948ae05c181f7	Vulnerable
Linux	Linux	4.14	Vulnerable
Linux	Linux	0 to < 4.14	Patched
Linux	Linux	5.10.254 to <= 5.10.*	Patched
Linux	Linux	5.15.204 to <= 5.15.*	Patched

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

High

Confidentiality

High

Integrity

High

Scope

Unchanged

Attack Complexity

Low

Attack Vector

Local

Privileges Req

Low

User Interaction

None

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
7.8	CVSS 3.1	high	1.8	5.9	CNA, Linux (CNA), GHSA

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

Weakness & attack patterns

CWE-669
CWE-1288

Inferred from the weakness class — not observed against this CVE.

CAPEC-242 · Code InjectionCAPEC-35 · Leverage Executable Code in Non-Executable Files

CISA KEV details

CISA lists a CVE here once it has evidence of exploitation against real targets.

CISAThat month →

Listed

May 1, 2026

Federal deadline

May 15, 2026

passed 105 days ago

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a date to argue against.

Public exploit

Capability, not use: code existing is a different claim from anyone running it.

Repositories

793

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Monitor for scanner or exploit-pattern traffic after 793 public PoC repositories were reported.

EDR process telemetryhost service logs

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 7.8 (AV:L)
Jul 15, 2026 · NVD
Added to CISA KEV catalog
May 1, 2026 · CISA
Initial · CVE published
Apr 22, 2026 · NVD
Added · GHSA-2274-3hgr-wxv6 published (high)
Apr 22, 2026 · GitHub Security Advisory

References

129 on the record

Elsewhere on this site

Linuxevery CVE for this vendor
May 2026what else CISA listed
Remote Code Execsame class
CWE-669other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2026-31431 is crypto: algif_aead - Revert to operating out-of-place, a high vulnerability affecting Linux from Linux. The current evidence lists it in CISA KEV, and the exploit status is: Yes: CISA KEV signal present. Public exploit evidence is: 793 public PoC repositories reported; 0 marked weaponized in current dataset. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 7.8 describes technical severity, while EPSS 100% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.