CVE-2026-35091: Red Hat Enterprise Linux 10 · Incorrect Check of Function Return Value
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 8.2 High.
Data as of 30 Oct 2026, 06:59 UTC
- 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:HExploitation evidence
Disclosed: evidence found.
CVE published 1 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 29 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10corosync | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10corosync | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10.0 Extended Update Supportcorosync | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7 Extended Lifecycle Supportcorosync | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8corosync | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportcorosync | Affected– | 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
- access.redhat.com/errata/RHSA-2026:13644 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:13657 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:13673 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14205 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14210 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14211 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14212 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14213 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14214 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14215 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:14216 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:19043 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:19200 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20916 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-35091 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2453169 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2453813 (opens in a new tab)