CVE-2026-58216: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 10
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.
AI Analysis
Technical Summary
CVE-2026-58216 is an out-of-bounds read vulnerability in the Samba Kerberos Key Distribution Center's (KDC) password change (kpasswd) service on Red Hat Enterprise Linux 10. When handling malformed ASN.1-encoded Kerberos password change requests, the Samba server miscalculates the structure size and reads up to six bytes beyond the allocated buffer. This typically results in a decryption failure, but if the read accesses unmapped memory, it causes the KDC process to crash. An authenticated attacker can exploit this by sending a crafted kpasswd request, causing denial of service via KDC process termination.
Potential Impact
The vulnerability can cause the Kerberos KDC process to crash, resulting in denial of service. There is no impact on confidentiality or integrity. Exploitation requires low privilege authentication and a specially crafted request. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-58216 for current remediation guidance. Until a patch is available, restrict access to the kpasswd service to trusted authenticated users to reduce risk. Monitor for abnormal KDC process crashes as an indicator of exploitation attempts.
CVE-2026-58216: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 10
Description
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.
CVSS v3.1
Score 5.3medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-58216 is an out-of-bounds read vulnerability in the Samba Kerberos Key Distribution Center's (KDC) password change (kpasswd) service on Red Hat Enterprise Linux 10. When handling malformed ASN.1-encoded Kerberos password change requests, the Samba server miscalculates the structure size and reads up to six bytes beyond the allocated buffer. This typically results in a decryption failure, but if the read accesses unmapped memory, it causes the KDC process to crash. An authenticated attacker can exploit this by sending a crafted kpasswd request, causing denial of service via KDC process termination.
Potential Impact
The vulnerability can cause the Kerberos KDC process to crash, resulting in denial of service. There is no impact on confidentiality or integrity. Exploitation requires low privilege authentication and a specially crafted request. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-58216 for current remediation guidance. Until a patch is available, restrict access to the kpasswd service to trusted authenticated users to reduce risk. Monitor for abnormal KDC process crashes as an indicator of exploitation attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-29T18:13:08.159Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-58216","vendor":"Red Hat"}]
Threat ID: 6a6b7a619c2644c7f85890ae
Added to database: 07/30/2026, 16:22:57 UTC
Last enriched: 07/30/2026, 16:39:32 UTC
Last updated: 07/30/2026, 23:51:54 UTC
Views: 8
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