grub2 security update

An update is available for grub2. This update affects Rocky Linux 8. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list The grub2 packages provide version 2 of the Grand Unified Boot Loader GRUB, a...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2, where its configuration file, known as grub.cfg, is created with the wrong permission set, allowing non-privileged users to read its contents. This represents a minor confidentiality issue, as those users could potentially access any encrypted passwords contained i...

Astra Linux – Vulnerability in grub2

A carefully crafted JPEG image may cause the JPEG reader to underflow its data pointer, allowing user-controlled data to be written into the heap. For the attack to succeed, the attacker must analyze the heap layout and create an image with malicious format and payloads. This vulnerability can le...

Astra Linux – Vulnerability in grub2

A use-after-free vulnerability has been identified in the GNU GRUB Grand Unified Bootloader. The flaw occurs because the process that closes files improperly retains a memory pointer, leaving an invalid reference to a file system structure. An attacker could exploit this vulnerability to cause th...

Astra Linux – Vulnerability in grub2

A heap out-of-bounds write may occur during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. The impacts on confidentiality, integrity, and availability are considered low, as it is very complex for an attacker to control the encoding and...

Astra Linux – Vulnerability in grub2

A crafted 16-bit grayscale PNG image may lead to an out-of-bounds write in the heap area. An attacker may exploit this to cause heap data corruption or, ultimately, arbitrary code execution and circumvent secure boot protections. This issue is highly complex to exploit; an attacker needs to perfo...

Astra Linux – Vulnerability in grub2

Out-of-bounds write when handling split HTTP headers: When dealing with split HTTP headers, GRUB2’s HTTP code accidentally moves its internal data buffer point by one position. This can lead to an out-of-bounds write during the parsing of the HTTP request, resulting in writing a NULL byte beyond...

Astra Linux – Vulnerability in grub2

A out-of-bounds read flaw was discovered in Grub2’s NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack can result in sensitive data cached in memory or EFI variabl...

Astra Linux – Vulnerability in grub2

A out-of-bounds write flaw was discovered in grub2’s NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, resulting in corruption of grub’s heap metadata. In some cases, the attack may also corrupt the UEFI firmware heap metadata. As a...

Astra Linux – Vulnerability in grub2

When rendering certain Unicode sequences, Grub2’s font code does not properly validate whether the width and height of the glyph are within the bitmap size. As a result, an attacker can create an input that will cause an out-of-bounds write to Grub2’s heap, leading to memory corruption and...

Astra Linux – Vulnerability in grub2

There is a use-after-free vulnerability in the grubcmdchainloader function. The chainloader command is used to boot up operating systems that do not support multiboot and do not have direct support from GRUB2. When executing chainloader more than once, a use-after-free vulnerability is triggered...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2 in versions prior to 2.06. The option parser allows an attacker to overwrite a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The greatest threat from this vulnerability is to data confidentiality and...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2 in versions prior to 2.06. Variable names present in the supplied command line are expanded into their corresponding variable contents, using a 1 kB stack buffer for temporary storage. However, there is insufficient bounds checking. If the function is called with a...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read without sufficient bounds checking, assuming that the USB device provides valid values. If exploited properly, an attacker could cause memory corruption, leading to arbitrary code...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2 in versions prior to 2.06, where it incorrectly enabled the use of the ACPI command when Secure Boot was enabled. This flaw allows an attacker with privileged access to create a Secondary System Description Table SSDT containing code that can overwrite the Linux...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2. When reading the name of a symbolic link from a UFS filesystem, grub2 fails to validate the string length provided as input. This lack of validation may lead to a heap out-of-bounds write, causing data integrity issues and potentially allowing an attacker to...

CLSA-2026-1779219098 grub2: Fix of CVE-2023-4692

CVE-2023-4692: fix OOB write when parsing NTFS $ATTRIBUTELIST entries...

Exploit for Out-of-bounds Write in Linux Linux_Kernel

CVE-2026-43500 / CVE-2026-43284 / Dirty Frag mitigation rxrpc...

SUSE-SU-2026:21621-1 Security update for grub2

This update for grub2 fixes the following issues - CVE-2025-54770: Missing unregister call for netsetvlan command may lead to use-after-free bsc1252930. - CVE-2025-54771: grubfileclose does not properly controls the fs refcount bsc1252931. - CVE-2025-61661: Out-of-bounds write in grubusbgetstring...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: grub2 (UTSA-2026-017480)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017480 advisory. A flaw was found in grub2 in versions prior to 2.06. Setparamprefix in the menu rendering code performs a length calculation on the assumption that expressing a quot...