SB2026080314 - Red Hat Enterprise Linux 9 update for kernel
Published: August 3, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 13 vulnerabilities.
1) Resource management error (CVE-ID: CVE-2025-40026)
CWE-ID: CWE-399 - Resource Management Errors
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 perform a denial of service (DoS) attack.
The vulnerability exists due to resource management error within the emulator_is_smm() and x86_emulate_instruction() functions in arch/x86/kvm/x86.c. A local user can perform a denial of service (DoS) attack.
2) Improper locking (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper memory synchronization in broadcast TLBI completion in the arm64 TLB invalidation handling when performing broadcast TLB invalidation on affected Arm CPUs. A local user can trigger affected memory access patterns to disclose sensitive information, modify data, or cause a denial of service.
The issue affects completion of memory accesses translated by an invalidated TLB entry, while TLB entries themselves are still invalidated correctly.
3) Race condition (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper memory synchronization in broadcast TLB invalidation completion handling in the arm64 CPU errata handling for affected Arm CPUs when performing broadcast TLB invalidation sequences. A local user can trigger memory accesses relying on an invalidated TLB entry to disclose sensitive information, modify data, or cause a denial of service.
The issue affects only the completion of memory accesses translated by an invalidated TLB entry; the TLB entries themselves are still invalidated correctly.
4) Improper locking (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper memory access ordering in arm64 TLB invalidation handling when performing broadcast TLB invalidation on affected Arm CPUs. A local user can trigger affected memory access completion conditions to disclose sensitive information, modify data, or cause a denial of service.
The issue affects only memory accesses translated by an invalidated TLB entry; TLB entries themselves are still invalidated correctly.
5) Improper locking (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper synchronization in broadcast TLB invalidation handling in the arm64 TLB invalidation logic when processing TLBI and DSB sequences on affected Arm CPUs. A local user can trigger memory accesses involving translations from an invalidated TLB entry to disclose sensitive information, modify data, or cause a denial of service.
The issue affects only the completion of memory accesses translated by an invalidated TLB entry and does not prevent the actual invalidation of TLB entries.
6) Improper locking (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-667 - Improper Locking
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 improper hardware synchronization in broadcast TLBI completion on affected arm64 CPUs when performing broadcast TLB invalidation. A local user can trigger memory access activity that relies on an invalidated TLB entry to cause a denial of service.
The issue affects only the completion of memory accesses translated by an invalidated TLB entry; the TLB invalidation itself still occurs correctly.
7) Race condition (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 improper synchronization in broadcast TLBI completion in the arm64 TLB invalidation handling when performing broadcast TLB invalidation on affected Arm CPUs. A local user can trigger memory access patterns that rely on invalidated TLB entries to cause a denial of service.
The issue affects the completion of memory accesses translated by an invalidated TLB entry, while the TLB invalidation itself still occurs correctly.
8) Race condition (CVE-ID: CVE-2025-10263)
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 improper synchronization in broadcast TLB invalidation completion handling in the arm64 CPU errata logic when performing memory accesses translated by an invalidated TLB entry after a TLBI;DSB sequence. A local user can trigger affected memory access patterns to cause a denial of service.
The issue affects certain Arm CPUs on arm64 systems and does not prevent invalidation of TLB entries themselves.
9) Improper locking (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-667 - Improper Locking
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 improper hardware synchronization in arm64 TLB invalidation handling when processing broadcast TLB invalidation sequences on affected Arm CPUs. A local user can trigger memory accesses that rely on an invalidated TLB entry to cause a denial of service.
The issue affects only the completion of memory accesses translated by an invalidated TLB entry and does not affect the actual invalidation of TLB entries.
10) Race condition (CVE-ID: CVE-2025-10263)
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 improper synchronization in broadcast TLB invalidation completion handling in the arm64 TLB invalidation logic when performing memory accesses translated by an invalidated TLB entry after a TLBI;DSB sequence. A local user can trigger affected memory access patterns to cause a denial of service.
The issue affects only the completion of memory accesses translated by an invalidated TLB entry and does not prevent the actual invalidation of TLB entries.
11) Improper locking (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-667 - Improper Locking
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 improper memory synchronization in broadcast TLB invalidation completion handling in the arm64 CPU errata logic when performing broadcast TLB invalidation on affected Arm CPUs. A local user can trigger memory access patterns that rely on invalidated TLB entries to cause a denial of service.
The issue affects only completion of memory accesses translated by an invalidated TLB entry and does not prevent the actual invalidation of TLB entries.
12) Improper access control (CVE-ID: CVE-2025-10263)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to improper access control in Stage 2 translation handling when invalidating translation lookaside buffer entries on affected Arm systems. A local user can trigger writes from a malicious guest after write permissions have been revoked to escalate privileges.
Only Xen on Arm in multi-core configurations is affected. The issue does not affect reads.
13) Use-after-free (CVE-ID: CVE-2026-52923)
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 ipc_idr_alloc() in the checkpoint/restore SysV IPC allocation path when processing a request for the next SysV IPC id. A local user can request allocation beyond the valid IPC id range to cause a denial of service.
A subsequent walk of /proc/sysvipc/shm can dereference freed memory through a stale IDR entry.
Remediation
Install update from vendor's website.