RHEL 10 : krb5 (RHSA-2026:99624)

high Nessus Plugin ID 379618

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:99624 advisory.

Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).

Security Fix(es):

* krb5: MIT krb5 kadmind unauthenticated memory exhaustion via failed AUTH_GSSAPI_INIT requests (CVE-2026-112323)

* krb5: MIT krb5 kadmind unauthenticated CPU DoS via AUTH_GSSAPI client states cleanup (CVE-2026-112322)

* krb5: MIT krb5 GSS-RPC client memory leak on XID mismatch retries (CVE-2026-112314)

* krb5: Unauthenticated KDC NULL pointer dereference KDC DoS via crafted PKINIT pre-auth request (CVE-2026-71200)

* krb5: MIT krb5 kadmind unauthenticated memory leak DoS via AUTH_GSSAPI_INIT error paths (CVE-2026-112321)

* krb5: MIT krb5 kadmind unauthenticated memory leak DoS via GSS-RPC auth flavor switching (CVE-2026-112320)

* krb5: Unauthorized key reset of protected principal via kpasswd (CVE-2026-107884)

* krb5: MIT krb5 kadmind authenticated memory exhaustion DoS via unbounded RPC XDR allocation (CVE-2026-112319)

* krb5: MIT krb5 kadmind authenticated DoS exploiting dereference of null policy name pointers (CVE-2026-112318)

* krb5: MIT krb5 KDC unauthenticated memory leak DoS in KDB keytab key decryption error path (CVE-2026-112317)

* krb5: MIT krb5 KDC unauthenticated CPU DoS via quadratic ASN.1 SEQUENCE OF decoding (CVE-2026-119079)

* krb5: MIT krb5 kadmind authenticated memory leak DoS in xdr_krb5_tl_data() decode failure (CVE-2026-112316)

* krb5: Improper authorization via flawed PAC checksum verification (CVE-2026-111423)

* krb5: MIT krb5 kadmind unauthenticated memory leak DoS in RPCSEC_GSS buffer decode failure (CVE-2026-112315)

* krb5: krb5: Denial of Service via malformed PAC in S4U2Proxy requests (CVE-2026-107708)

* krb5: krb5: Denial of Service via crafted forwarded credentials (CVE-2026-107778)

* krb5: Alteration of authentication indicators in CAMMAC container (CVE-2026-71199)

* krb5: kadmind: request alteration and protected information disclosure (CVE-2026-118380)

* krb5: Unauthenticated KDC DoS based on ASN.1 decoder read overrun (CVE-2026-107364)

Bug Fix(es) and Enhancement(s):

* Set PKINIT CMS signatureAlgorithm based on certificate public key type [rhel-10.3.z] (JIRA:RHEL-278063)

* auth_gssapi_wrap_data xdr_bytes failure leak [rhel-10.3.z] (JIRA:RHEL-296012)

* xdr_bytes() does not free its allocation on partial decode failure [rhel-10.3.z] (JIRA:RHEL-296023)

* RPCSEC_GSS context lifecycle leaks [rhel-10.3.z] (JIRA:RHEL-296034)

* xdr_krb5_principal decode leak [rhel-10.3.z] (JIRA:RHEL-296045)

* process_chpw_request leak [rhel-10.3.z] (JIRA:RHEL-296056)

* Read overruns in GSSRPC svcauth_unix [rhel-10.3.z] (JIRA:RHEL-296067)

* Null dereference in KDC dispatch corner case [rhel-10.3.z] (JIRA:RHEL-296081)

* KDC DoS based on otherName value in PKINIT SAN code [rhel-10.3.z] (JIRA:RHEL-296095)

* Memory leak on krb5 gss_accept_sec_context() failure [rhel-10.3.z] (JIRA:RHEL-296112)

* KDC authdata filter does not catch KDC-issued types nested inside AD-IF-RELEVANT containers [rhel-10.3.z] (JIRA:RHEL-296127)

* Dereference of empty first credential list element in GSS mechanism [rhel-10.3.z] (JIRA:RHEL-296997)

* Null dereference of principal names in krb5_rd_cred() [rhel-10.3.z] (JIRA:RHEL-297000)

* Fix validation issues for trusted inputs [rhel-10.3.z] (JIRA:RHEL-299144)

* Skip expired keys when iterating over KEYRING ccache [rhel-10.3.z] (JIRA:RHEL-299145)

* Pass through null deleg_cred from SPNEGO to mech [rhel-10.3.z] (JIRA:RHEL-299146)

* Fix leaks on error in PKINIT signed-data creation [rhel-10.3.z] (JIRA:RHEL-299147)

* Fix hex key input handling in ktutil addent [rhel-10.3.z] (JIRA:RHEL-299148)

* Check reply length before V4 reply check [rhel-10.3.z] (JIRA:RHEL-299149)

* Fix memory leak in mpool_get() error paths [rhel-10.3.z] (JIRA:RHEL-299150)

* json: Correctly abort parse on invalid array [rhel-10.3.z] (JIRA:RHEL-299151)

* Prevent unsigned int overflow in iakerb_save_token() [rhel-10.3.z] (JIRA:RHEL-299152)

* Fix ksu memory leak in fcmd_resolve() [rhel-10.3.z] (JIRA:RHEL-299153)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 379618

File Name: redhat-RHSA-2026-99624.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 11/12/2026

Updated: 11/12/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.5

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:N

CVSS Score Source: CVE-2026-71199

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-119079

CVSS v4

Risk Factor: High

Base Score: 7.1

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-107778

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.3, p-cpe:/a:redhat:enterprise_linux:krb5-devel, p-cpe:/a:redhat:enterprise_linux:krb5-libs, p-cpe:/a:redhat:enterprise_linux:krb5-pkinit, p-cpe:/a:redhat:enterprise_linux:krb5-server-ldap, p-cpe:/a:redhat:enterprise_linux:krb5-server, p-cpe:/a:redhat:enterprise_linux:krb5-workstation, p-cpe:/a:redhat:enterprise_linux:krb5-xrealmauthz, p-cpe:/a:redhat:enterprise_linux:krb5, p-cpe:/a:redhat:enterprise_linux:libkadm5

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2026

Vulnerability Publication Date: 10/8/2026

Reference Information

CVE: CVE-2026-107364, CVE-2026-107708, CVE-2026-107778, CVE-2026-107884, CVE-2026-111423, CVE-2026-112314, CVE-2026-112315, CVE-2026-112316, CVE-2026-112317, CVE-2026-112318, CVE-2026-112319, CVE-2026-112320, CVE-2026-112321, CVE-2026-112322, CVE-2026-112323, CVE-2026-118380, CVE-2026-119079, CVE-2026-71199, CVE-2026-71200

CWE: 125, 354, 408, 476, 620, 770, 772, 924

RHSA: 2026:99624

Detections

Analytics

RHEL 10 : krb5 (RHSA-2026:99624)

high Nessus Plugin ID 379618

Synopsis

Description

Solution

See Also

Plugin Details

Risk Information

VPR

Vendor

CVSS v2

CVSS v3

CVSS v4

Vulnerability Information

Reference Information