SB2026102915 - Red Hat Enterprise Linux 8 update for kernel-rt
Published: October 29, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-72288)
CWE-ID: CWE-416 - Use After Free
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 a use-after-free in the KVM arm64 virtual generic interrupt controller (vgic) AP list handling when racing interrupt affinity changes with LPI disabling. A local user can trigger concurrent interrupt state changes to cause a denial of service.
The issue occurs during LPI handling involving multiple vCPUs.
2) Race condition (CVE-ID: CVE-2026-72289)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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 a race condition in vgic_prune_ap_list() in the KVM arm64 virtual generic interrupt controller when migrating an interrupt to another vCPU while locks are temporarily dropped. A local user can trigger interrupt migration during this race to cause a denial of service.
The issue can result in list_del() being performed on an interrupt entry that has already been removed from the ap_list.
3) Out-of-bounds read (CVE-ID: CVE-2026-90011)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the iSCSI target login payload buffer when processing a crafted login PDU without a terminating null byte. A remote attacker can send a crafted login PDU to disclose sensitive information and cause a denial of service.
Exploitation is reachable through the CHAP authentication path on a portal configured for CHAP.
4) Integer overflow (CVE-ID: CVE-2026-98222)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to write beyond an allocated kernel heap buffer.
The vulnerability exists due to integer overflow in encrypted_key_alloc() when calculating encrypted key payload lengths. A local user can supply key data whose combined lengths exceed the 16-bit allocation size limit to write beyond an allocated kernel heap buffer.
Remediation
Install update from vendor's website.