CVE-2026-58221

highcovered by 4 sourcesfirst seen 2026-07-28

It was discovered that Samba's pam_winbind incorrectly handled home directory ownership when mkhomedir was enabled. A local attacker could possibly use this issue to cause a denial of service by triggering a change in ownership of the root directory. (CVE-2026-15779) Arjun Basnet, Douglas Bagnall, and Andrew Tridgell discovered that Samba incorrectly handled TSIG packets with name compression. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2026-6949) Tristan Madani discovered that Samba incorrectly handled malformed ASN.1 kpasswd packets. An authenticated user could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2026-58216) Andrew Tridgell and Tristan Madani discovered that Samba incorrectly handled TKEY name registration. A remote attacker could possibly use this issue to exhaust the TKEY name cache, resulting in a denial of service. (CVE-2026-58218) It was discovered that Samba incorrectly handled internal LDB special directory names when processing authenticated LDAP requests. An authenticated user could possibly use this issue to perform unauthorized modifications and gain control of a domain. (CVE-2026-58221) Andrew Tridgell and Tristan Madani discovered that Samba incorrectly handled LDAP Compare requests. An authenticated user could possibly use this issue to obtain sensitive information. (CVE-2026-58222) Tristan Madani, Andrew Tridgell, and Martin Schwenke discovered that the CTDB protocol in Samba had insufficient bounds checking. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2026-58224)

CSIRTS triage

What: Samba has vulnerabilities that can lead to denial of service under certain conditions.
Who is affected: Local and remote attackers can exploit these vulnerabilities in Samba installations.
Urgency: Remediation is urgent as these vulnerabilities can cause service disruptions, although exploitation status is currently unknown.
Action: Users should apply updates to Samba to address these vulnerabilities.

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Advisory coverage (4)

high[NEW] [high] Samba: Multiple vulnerabilitiescert-bund · 2026-07-31
unknownUSN-8621-1: Samba vulnerabilitiesubuntu · 2026-07-28
unknownMultiple vulnerabilities in Samba (July 28, 2026)cert-fr-avis · 2026-07-28
unknownDSA-6401-1 samba - security updatedebian · 2026-07-28

External references

NVD record for CVE-2026-58221

CVE.org record

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