Source: grub2 Version: 2.14~git20250718.0e36779-2 Severity: important Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerabilities were published for grub2. CVE-2025-54770[0]: | A vulnerability has been identified in the GRUB2 bootloader's | network module that poses an immediate Denial of Service (DoS) risk. | This flaw is a Use-after-Free issue, caused because the net_set_vlan | command is not properly unregistered when the network module is | unloaded from memory. An attacker who can execute this command can | force the system to access memory locations that are no longer | valid. Successful exploitation leads directly to system instability, | which can result in a complete crash and halt system availability CVE-2025-54771[1]: | A use-after-free vulnerability has been identified in the GNU GRUB | (Grand Unified Bootloader). The flaw occurs because the file-closing | process incorrectly retains a memory pointer, leaving an invalid | reference to a file system structure. An attacker could exploit this | vulnerability to cause grub to crash, leading to a Denial of | Service. Possible data integrity or confidentiality compromise is | not discarded. CVE-2025-61661[2]: | A vulnerability has been identified in the GRUB (Grand Unified | Bootloader) component. This flaw occurs because the bootloader | mishandles string conversion when reading information from a USB | device, allowing an attacker to exploit inconsistent length values. | A local attacker can connect a maliciously configured USB device | during the boot sequence to trigger this issue. A successful | exploitation may lead GRUB to crash, leading to a Denial of Service. | Data corruption may be also possible, although given the complexity | of the exploit the impact is most likely limited. CVE-2025-61662[3]: | A Use-After-Free vulnerability has been discovered in GRUB's gettext | module. This flaw stems from a programming error where the gettext | command remains registered in memory after its module is unloaded. | An attacker can exploit this condition by invoking the orphaned | command, causing the application to access a memory location that is | no longer valid. An attacker could exploit this vulnerability to | cause grub to crash, leading to a Denial of Service. Possible data | integrity or confidentiality compromise is not discarded. CVE-2025-61663[4]: | A vulnerability has been identified in the GRUB2 bootloader's normal | command that poses an immediate Denial of Service (DoS) risk. This | flaw is a Use-after-Free issue, caused because the normal command is | not properly unregistered when the module is unloaded. An attacker | who can execute this command can force the system to access memory | locations that are no longer valid. Successful exploitation leads | directly to system instability, which can result in a complete crash | and halt system availability. Impact on the data integrity and | confidentiality is also not discarded. CVE-2025-61664[5]: | A vulnerability in the GRUB2 bootloader has been identified in the | normal module. This flaw, a memory Use After Free issue, occurs | because the normal_exit command is not properly unregistered when | its related module is unloaded. An attacker can exploit this | condition by invoking the command after the module has been removed, | causing the system to improperly access a previously freed memory | location. This leads to a system crash or possible impacts in data | confidentiality and integrity. If you fix the vulnerabilities please also make sure to include the CVE (Common Vulnerabilities & Exposures) ids in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2025-54770 https://www.cve.org/CVERecord?id=CVE-2025-54770 [1] https://security-tracker.debian.org/tracker/CVE-2025-54771 https://www.cve.org/CVERecord?id=CVE-2025-54771 [2] https://security-tracker.debian.org/tracker/CVE-2025-61661 https://www.cve.org/CVERecord?id=CVE-2025-61661 [3] https://security-tracker.debian.org/tracker/CVE-2025-61662 https://www.cve.org/CVERecord?id=CVE-2025-61662 [4] https://security-tracker.debian.org/tracker/CVE-2025-61663 https://www.cve.org/CVERecord?id=CVE-2025-61663 [5] https://security-tracker.debian.org/tracker/CVE-2025-61664 https://www.cve.org/CVERecord?id=CVE-2025-61664 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
