# CVE-2026-112314: Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries

Status: published. Published: 2026-11-09. Updated: 2026-11-12.

clnttcp_call() in lib/rpc/clnt_tcp.c in MIT Kerberos 5 (aka krb5) does not free the RPC reply verifier between retries, which allows remote attackers to cause a denial of service (memory leak in GSS-RPC client programs) by injecting RPC replies with mismatched XIDs or by triggering authentication retries.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (krb5): ≥ 0:1.21.3-11.el10_3.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (krb5): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.92% as of 2026-11-10; percentile 60.44%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-772

## Exploit evidence

- exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2478446 (ADP: CISA-ADP)

## References

- https://access.redhat.com/errata/RHSA-2026:99624 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-112314 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478446 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478446 (ADP: CISA-ADP; exploit)

- https://access.redhat.com/security/cve/CVE-2026-112314 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478446 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478446 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-112314; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112314; retrieved 2026-11-10; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-112314; retrieved 2026-11-11; source updated Not reported

Revision: a7d10658e21584141cd7bccb02680fe9374009c8b6e68d6a8d5d6e8d6cbf2c63

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