CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2026-112316 Krb5: mit krb5 kadmind authenticated memory leak dos in xdr_krb5_tl_data() decode failure
Medium (6.5) in red hat. EPSS 0.9% estimated probability of exploitation activity in the next 30 days.
On this page
xdr_krb5_tl_data() in lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) does not free partially decoded data on failure, which allows remote authenticated users to cause a denial of service (memory leak in kadmind) via crafted RPC requests that trigger a decode failure.
Severity
- EPSS
- 0.9% estimated probability of exploitation activity in the next 30 days; 61st percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-772 Missing Release of Resource after Effective Lifetime
- Published
- Modified
- Assigned by
- redhat (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- red hat:red hat enterprise linux 10
- red hat:red hat enterprise linux 10.2 extended update support
- red hat:red hat enterprise linux 6
- red hat:red hat enterprise linux 7
- red hat:red hat enterprise linux 8
- red hat:red hat enterprise linux 9
- red hat:red hat enterprise linux 9.8 extended update support
- red hat:red hat hardened images
Versions
From the CNA's record in the CVE List.
Fixed in
| Product | Fixed in |
|---|---|
| Red Hat Enterprise Linux 10 | 0:1.21.3-11.el10_3.2 |
| Red Hat Enterprise Linux 10.2 Extended Update Support | 0:1.21.3-10.el10_2.2 |
| Red Hat Enterprise Linux 9 | 0:1.21.1-10.el9_9.2 |
| Red Hat Enterprise Linux 9.8 Extended Update Support | 0:1.21.1-10.el9_8.3 |
| Red Hat Hardened Images | 1.22.3-0.1.hum1 |
Fix and patched versions
- Red Hat Red Hat Enterprise Linux 10: fixed in 0:1.21.3-11.el10_3.2
- Red Hat Red Hat Enterprise Linux 10.2 Extended Update Support: fixed in 0:1.21.3-10.el10_2.2
- Red Hat Red Hat Enterprise Linux 9: fixed in 0:1.21.1-10.el9_9.2
- Red Hat Red Hat Enterprise Linux 9.8 Extended Update Support: fixed in 0:1.21.1-10.el9_8.3
- Red Hat Red Hat Hardened Images: fixed in 1.22.3-0.1.hum1
- Red Hat, Rocky Linux, Alpine, Alpaquita: fixed package versions per release
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13, 14 | krb5 | no fix listed | DEBIAN-CVE-2026-112316 |
| Ubuntu | 20.04:LTS, 22.04:LTS, 24.04:LTS and 5 more | krb5 | no fix listed | UBUNTU-CVE-2026-112316 |
| Red Hat | enterprise_linux:9::appstream | krb5-devel, krb5-debuginfo, krb5-debugsource and 7 more | 0:1.21.1-10.el9_9.2 | RHSA-2026:99715 |
| Red Hat | enterprise_linux:9::baseos | krb5, libkadm5, krb5-libs and 14 more | 0:1.21.1-10.el9_9.2 | RHSA-2026:99715 |
| Red Hat | enterprise_linux:10.3 | krb5, libkadm5, krb5-libs and 15 more | 0:1.21.3-11.el10_3.2 | RHSA-2026:99624 |
| Red Hat | enterprise_linux_eus:10.2 | krb5, libkadm5, krb5-libs and 15 more | 0:1.21.3-10.el10_2.2 | RHSA-2026:99625 |
| Red Hat | hummingbird:1 | krb5, libkadm5, krb5-libs and 7 more | 0:1.22.3-0.1.hum1 | RHSA-2026:97811 |
| Red Hat | rhel_eus:9.8::appstream | krb5-devel, krb5-debuginfo, krb5-debugsource and 7 more | 0:1.21.1-10.el9_8.3 | RHSA-2026:99716 |
| Red Hat | rhel_eus:9.8::baseos | krb5, libkadm5, krb5-libs and 14 more | 0:1.21.1-10.el9_8.3 | RHSA-2026:99716 |
| Rocky Linux | 9 | libkadm5, krb5-libs, krb5-devel and 14 more | 0:1.21.1-10.el9_9.2 | RLSA-2026:99715 |
| Rocky Linux | 10 | libkadm5, krb5-libs, krb5-devel and 14 more | 0:1.21.3-11.el10_3.2 | RLSA-2026:99624 |
| Alpine | v3.23, v3.24 | krb5 | 1.22.3-r0 | ALPINE-CVE-2026-112316 |
| Azure Linux | 3 | krb5 | no fix listed | AZL-113549 |
| Alpaquita | 23 | krb5 | 1.20.2-r5 | BELL-CVE-2026-112316 |
| Alpaquita | 25, stream | krb5 | 1.22.3-r0 | BELL-CVE-2026-112316 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Red Hat Security Data © Red Hat, Inc., CC BY 4.0; Rocky Linux's errata, BSD-3-Clause; the Alpine secdb, CC BY-SA 4.0; Microsoft's Azure Linux vulnerability data, MIT; BellSoft's OSV database, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · Red Hat · Alpine · Alpaquita.
Red Hat
Red Hat rates this Important.
Red Hat rates this vulnerability as an Important severity flaw because an authenticated remote principal can induce unbounded heap memory exhaustion in the Kerberos administration daemon (`kadmind`), resulting in a persistent denial of service. Any legitimate client session can exploit the issue prior to administrative authorization checks. The flaw does not warrant a Critical rating because exploitation requires valid authentication and is confined strictly to process memory exhaustion without enabling arbitrary code execution or data leakage.
Restrict network access to kadmind to trusted hosts, or disable it in favor of kadmin.local server-side command line tool for administration operations if possible.
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | krb5-0:1.21.3-11.el10_3.2 | Fixed 2026-11-12 | RHSA-2026:99624 |
| Red Hat Enterprise Linux 10.2 Extended Update Support | krb5-0:1.21.3-10.el10_2.2 | Fixed 2026-11-12 | RHSA-2026:99625 |
| Red Hat Enterprise Linux 9 | krb5-0:1.21.1-10.el9_9.2 | Fixed 2026-11-12 | RHSA-2026:99715 |
| Red Hat Enterprise Linux 9.8 Extended Update Support | krb5-0:1.21.1-10.el9_8.3 | Fixed 2026-11-12 | RHSA-2026:99716 |
| Red Hat Enterprise Linux 6 | krb5 | Out of support scope | |
| Red Hat Enterprise Linux 7 | krb5 | Affected | |
| Red Hat Enterprise Linux 8 | krb5 | Affected | |
| Red Hat Hardened Images | krb5 | Affected |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-112316.
Attack patterns (CAPEC)
- CAPEC-469 HTTP DoS Severity: Low
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.
References
- https://access.redhat.com/errata/RHSA-2026:97811
- https://access.redhat.com/errata/RHSA-2026:99624
- https://access.redhat.com/errata/RHSA-2026:99625
- https://access.redhat.com/errata/RHSA-2026:99715
- https://access.redhat.com/errata/RHSA-2026:99716
- https://access.redhat.com/security/cve/CVE-2026-112316
- https://bugzilla.redhat.com/show_bug.cgi?id=2479331