VulnerabilityPublished 11 Sep 2025Updated 21 Oct 2026

CVE-2025-39789: Linux kernel · crypto: x86/aegis – Add missing error checks

Affects Linux kernelSource CVE Database V5

Not known to be exploited · CVSS 7.3 High · fixed in b4ba650125d21e937f82fcafcd2738fe31209c05 : patch Linux kernel soon.

Data as of 26 Oct 2026, 12:55 UTC

CVSS 3.1 base score

7.3High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b4ba650125d21e937f82fcafcd2738fe31209c05, 475104178f4d30e749ee4f5473c87f692b93bebb, 74d3b91f1598eedf87a977702f9f55e32698206d +1

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

Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to b4ba650125d21e937f82fcafcd2738fe31209c05, 475104178f4d30e749ee4f5473c87f692b93bebb, 74d3b91f1598eedf87a977702f9f55e32698206d or 3d9eb180fbe8828cce43bce4c370124685b205c3.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1d373d4e8e15b358f08de52956b32e0e38a11f84, < b4ba650125d21e937f82fcafcd2738fe31209c05	Fixed in b4ba650125d21e937f82fcafcd2738fe31209c05
LinuxLinux	Affected ≥ 1d373d4e8e15b358f08de52956b32e0e38a11f84, < 475104178f4d30e749ee4f5473c87f692b93bebb	Fixed in 475104178f4d30e749ee4f5473c87f692b93bebb
LinuxLinux	Affected ≥ 1d373d4e8e15b358f08de52956b32e0e38a11f84, < 74d3b91f1598eedf87a977702f9f55e32698206d	Fixed in 74d3b91f1598eedf87a977702f9f55e32698206d
LinuxLinux	Affected ≥ 1d373d4e8e15b358f08de52956b32e0e38a11f84, < 3d9eb180fbe8828cce43bce4c370124685b205c3	Fixed in 3d9eb180fbe8828cce43bce4c370124685b205c3
LinuxLinux	Affected =4.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: x86/aegis - Add missing error checks The skcipher_walk functions can allocate memory and can fail, so checking for errors is necessary.

References

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