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VulnerabilityPublished Updated

CVE-2026-35091: Red Hat Enterprise Linux 10 · Incorrect Check of Function Return Value

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 8.2 High.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.8% chance of exploitation in 30 days – higher than 59% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10corosyncAffected–Fixed in–
Red Hat Enterprise Linux 10corosyncAffected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update SupportcorosyncAffected–Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle SupportcorosyncAffected–Fixed in–
Red Hat Enterprise Linux 8corosyncAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportcorosyncAffected–Fixed in–

AI-suggested

Red Hat has released official security updates for the corosync packages that address CVE-2026-35091. Applying these updates as per Red Hat's advisories (RHSA-2026:13644 for RHEL 10 and RHSA-2026:13657 for RHEL 8) is the recommended remediation. Detailed update instructions are available at https://access.redhat.com/articles/11258. Systems running affected versions of Red Hat Enterprise Linux should be updated promptly to mitigate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents

References

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