AlmaLinux recently distributed a series of important security advisories for version 9. The updates cover essential infrastructure components like several dotnet framework versions, Redis seven, OpenSSL, and the base Linux kernel. Each notification highlights critical flaws including remote code execution risks, denial of service vulnerabilities, and dangerous memory corruption issues that attackers could easily exploit. IT teams need to apply these patches immediately to secure their servers against known threats before any damage occurs.

ALSA-2026:25221: .NET 9.0 security update (Important)
ALSA-2026:25219: redis:7 security update (Important)
ALSA-2026:25222: .NET 10.0 security update (Important)
ALSA-2026:25220: .NET 8.0 security update (Important)
ALSA-2026:25239: openssl security update (Important)
ALSA-2026:24381: kernel security update (Important)

ALSA-2026:25221: .NET 9.0 security update (Important)

Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-12

Summary:

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.118 and .NET Runtime 9.0.17.Security Fix(es):

* dotnet: .NET: Local file tampering via link following vulnerability (CVE-2026-45491)
* dotnet: ASP.NET Core: Denial of Service via uncontrolled resource consumption (CVE-2026-45591)

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.

Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-25221.html

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Kind regards,
AlmaLinux Team

ALSA-2026:25219: redis:7 security update (Important)

Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-12

Summary:

Redis is an advanced key-value store. It is often referred to as a data-structure server since keys can contain strings, hashes, lists, sets, and sorted sets. For performance, Redis works with an in-memory data set. You can persist it either by dumping the data set to disk every once in a while, or by appending each command to a log.

Security Fix(es):

* redis: use-after-free in unblock client flow may allow remote code execution (CVE-2026-23479)
* redis: Remote code execution via use-after-free in Lua scripting (CVE-2026-23631)
* redis: RESTORE invalid memory access may allow remote code execution (CVE-2026-25243)

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.

Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-25219.html

This message is automatically generated, please don’t reply. For further questions, please, contact us via the AlmaLinux community chat: https://chat.almalinux.org/.
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Kind regards,
AlmaLinux Team

ALSA-2026:25222: .NET 10.0 security update (Important)

Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-12

Summary:

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 10.0.109 and .NET Runtime 10.0.9.Security Fix(es):

* dotnet: .NET: Local file tampering via link following vulnerability (CVE-2026-45491)
* dotnet: ASP.NET Core: Denial of Service via uncontrolled resource consumption (CVE-2026-45591)

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.

Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-25222.html

This message is automatically generated, please don’t reply. For further questions, please, contact us via the AlmaLinux community chat: https://chat.almalinux.org/.
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Kind regards,
AlmaLinux Team

ALSA-2026:25220: .NET 8.0 security update (Important)

Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-12

Summary:

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.128 and .NET Runtime 8.0.28.Security Fix(es):

* dotnet: .NET: Local file tampering via link following vulnerability (CVE-2026-45491)
* dotnet: ASP.NET Core: Denial of Service via uncontrolled resource consumption (CVE-2026-45591)

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.

Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-25220.html

This message is automatically generated, please don’t reply. For further questions, please, contact us via the AlmaLinux community chat: https://chat.almalinux.org/.
Want to change your notification settings? Sign in and manage mailing lists on https://lists.almalinux.org.

Kind regards,
AlmaLinux Team

ALSA-2026:25239: openssl security update (Important)

Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-12

Summary:

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

* openssl: OpenSSL: Heap buffer overflow due to signed integer overflow in Unicode output sizing (CVE-2026-7383)
* openssl: OpenSSL: Denial of Service due to heap out-of-bounds read in CMS password-based decryption (CVE-2026-9076)
* openssl: OpenSSL: Heap buffer over-read in ASN.1 decoding can lead to denial of service or information disclosure. (CVE-2026-34180)
* openssl: PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys (CVE-2026-34181)
* openssl: CMS AuthEnvelopedData Processing May Accept Forged Messages (CVE-2026-34182)
* openssl: Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler (CVE-2026-34183)
* openssl: NULL pointer dereference in QUIC server initial packet handling (CVE-2026-42764)
* openssl: Possible NULL Dereference in Password-Based CMS Decryption (CVE-2026-42766)
* openssl: NULL Pointer Dereference in CRMF EncryptedValue Decryption (CVE-2026-42767)
* openssl: Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt() (CVE-2026-42768)
* openssl: Trust-Anchor Substitution via cert/issuer Typo in CMP rootCaKeyUpdate (CVE-2026-42769)
* openssl: FFC-DH Peer Validation Uses Attacker-Supplied q (CVE-2026-42770)
* openssl: AES-OCB IV Ignored on EVP_Cipher() Path (CVE-2026-45445)
* openssl: Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes (CVE-2026-45446)
* openssl: Heap Use-After-Free in OpenSSL PKCS7_verify() (CVE-2026-45447)

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.

Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-25239.html

This message is automatically generated, please don’t reply. For further questions, please, contact us via the AlmaLinux community chat: https://chat.almalinux.org/.
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Kind regards,
AlmaLinux Team

ALSA-2026:24381: kernel security update (Important)

Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-11

Summary:

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)
* kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)
* kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)

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.

Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-24381.html

This message is automatically generated, please don’t reply. For further questions, please, contact us via the AlmaLinux community chat: https://chat.almalinux.org/.
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Kind regards,
AlmaLinux Team