Alpine: multiple xorg-server packages: security update to 21.1.16-r0

high Tenable Self-Hosted Container Security Plugin ID 426123

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

- A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change
mask are evaluated one after the other, changing the trigger values as requested, and eventually,
SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not
adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.
(CVE-2025-26601)

- A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a
global variable. If a client frees the root cursor, the internal reference points to freed memory and
causes a use-after-free. (CVE-2025-26594)

- A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-
sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to
check the bounds of the buffer and would copy the data regardless of the size. (CVE-2025-26595)

- A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group,
it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is
later called with a non-zero value of groups, this will cause a buffer overflow because the key actions
are of the wrong size. (CVE-2025-26597)

- An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for
the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match
was found. However, the code will return the last element of the list if no matching device ID is found,
which can lead to out-of-bounds memory access. (CVE-2025-26598)

Plugin Details

Severity: High

ID: 426123

Version: Revision 1.4

Type: Local

Family: Alpine Linux Local Security Checks

Published: 5/16/2025

Updated: 6/1/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.36

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2025-26601

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2/18/2025

Reference Information

CVE: CVE-2025-26594, CVE-2025-26595, CVE-2025-26597, CVE-2025-26598, CVE-2025-26599, CVE-2025-26600, CVE-2025-26601

Detections

Analytics