CVE-2025-21785VulnerabilityPublished 26 Mar 2025Updated 11 Oct 2026

SUSE · security update for kernel

Affects SUSESource GCVE Database

Not known to be exploited : upgrade to 8.10 soon.

Data as of 25 Oct 2026, 19:02 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.10

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Mar 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 2026-10-25.

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 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 redhat/kernel-rt to 8.10.

Affected software

Product	Affected	Fixed in
Red Hatredhat/kernel-rt`pkg:rpm/redhat/kernel-rt`Other threats	Affected >=8.0 <8.10	Fixed in 8.10

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available from Red Hat as detailed in advisory RHSA-2025:3127. Users should apply the updated kernel-rt packages and reboot their systems to ensure the fix is active. Follow the vendor's update instructions at https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the official fix.

Description

A high severity vulnerability (CVE-2025-21785) in the Linux kernel's arm64 cacheinfo code has been fixed. The flaw involved an out-of-bounds write to the cacheinfo array due to improper indexing when handling cache levels with separate data and instruction caches. This issue has been addressed by correcting the index increment logic. The vulnerability affects certain versions of the Linux kernel used in Red Hat Enterprise Linux 9.0 and related distributions. A patch is available and should be applied, with a system reboot required for the update to take effect.

Impact

The vulnerability could lead to memory corruption due to out-of-bounds writes in the kernel's cacheinfo array on arm64 systems. This may affect system stability or security depending on exploitation, but no known exploits are reported in the wild. The issue is rated as high severity by the vendor.

Summary

CVE-2025-21785 is a vulnerability in the Linux kernel's arm64 architecture cacheinfo code where the loop populating cache information did not properly account for cache levels with separate data and instruction caches. This resulted in an out-of-bounds write to the cacheinfo array. The fix involves incrementing the index for any populated leaf rather than any populated level, preventing the out-of-bounds condition. The issue affects kernel-rt packages in Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions and related products. The vendor has released patches to address this flaw.

CWE-787Out-of-bounds Write (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #5
The product writes data past the end, or before the beginning, of the intended buffer.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Oct 2026, 22:19 UTC

WeaknessesCWE-787

Technical details

References

Community reviews

Related threats