SB20260825141 - Red Hat Enterprise Linux 8 update for kernel
Published: August 25, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 vulnerabilities.
1) Improper input validation (CVE-ID: CVE-2026-31411)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in sigd_send() when handling sendmsg() input containing a forged vcc pointer. A local user can send a specially crafted message to cause a denial of service.
Exploitation requires control of the ATM signaling daemon role via the ATMSIGD_CTRL ioctl.
2) Out-of-bounds read (CVE-ID: CVE-2026-43051)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in wacom_intuos_bt_irq when processing Bluetooth HID reports. A remote attacker can send a specially crafted short report to disclose sensitive information.
Report ID 0x03 requires at least 22 bytes, and report ID 0x04 requires at least 32 bytes.
3) Improper access control (CVE-ID: CVE-2026-46054)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass SELinux access controls.
The vulnerability exists due to improper access control in SELinux overlayfs mmap() and mprotect() access checks when handling mmap() and mprotect() operations on overlayfs filesystems. A local user can map or change protections on an overlayfs file to bypass SELinux access controls.
4) Out-of-bounds write (CVE-ID: CVE-2026-53016)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in ccp_aes_complete() when processing AF_ALG rfc3686-ctr-aes-ccp requests. A local user can supply a request with an 8-byte IV to cause a denial of service.
5) Double free (CVE-ID: CVE-2026-63888)
CWE-ID: CWE-415 - Double Free
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a double free in iscsit_handle_text_cmd() when handling a Text PDU with a bad DataDigest on connections using ErrorRecoveryLevel greater than 0. A remote user can send a specially crafted text request to cause a denial of service.
On hardened kernels the flaw can trigger a remote kernel BUG(), while on non-hardened kernels it can corrupt the slab freelist. A follow-up Text Request on the same ITT or session teardown can free the same pointer again.
6) Out-of-bounds read (CVE-ID: CVE-2026-63888)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in iscsit_handle_text_cmd() when processing Text PDUs with DataDigest enabled. A remote user can send a specially crafted text request to cause a denial of service.
The issue is triggered when DataDigest is negotiated for the connection.
Remediation
Install update from vendor's website.