RHSA-2026:57251HighCVSS 8.8

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Published
August 20, 2026
Last Modified
October 30, 2026

🔗 CVE IDs covered (25)

CVE-2026-64017 →CVE-2026-68388 →CVE-2026-53136 →CVE-2026-53329 →CVE-2026-53374 →CVE-2026-63884 →CVE-2026-63888 →CVE-2026-64382 →CVE-2026-43237 →CVE-2026-43493 →CVE-2026-45878 →CVE-2026-46185 →CVE-2026-63879 →CVE-2026-64219 →CVE-2026-64386 →CVE-2026-64560 →CVE-2026-43206 →CVE-2026-53356 →CVE-2026-63886 →CVE-2026-63952 →CVE-2026-64379 →CVE-2026-74580 →CVE-2026-45991 →CVE-2026-52991 →CVE-2026-53143 →

📋 Description

CVE-2026-43206 — kernel: drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set() CVE-2026-43237 — kernel: drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4 CVE-2026-43493 — kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests CVE-2026-45878 — kernel: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 CVE-2026-45991 — kernel: udf: fix partition descriptor append bookkeeping CVE-2026-46185 — kernel: smb/client: fix out-of-bounds read in symlink_data() CVE-2026-52991 — kernel: sched/psi: fix race between file release and pressure write CVE-2026-53136 — kernel: drm/amd/display: Clamp VBIOS HDMI retimer register count to array size CVE-2026-53143 — kernel: drm/amdkfd: Fix buffer overflow in SDMA queue checkpoint/restore on GFX11 CVE-2026-53329 — kernel: drm/amd/display: Use krealloc_array() in dal_vector_reserve() CVE-2026-53356 — kernel: drm/i915/gem: Fix phys BO pread/pwrite with offset CVE-2026-53374 — kernel: drm/amdgpu: zero-initialize GART table on allocation CVE-2026-63879 — kernel: drm/amdgpu: fix amdgpu_hmm_range_get_pages CVE-2026-63884 — kernel: drm/i915: Fix potential UAF in TTM object purge CVE-2026-63886 — kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode CVE-2026-63888 — kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() CVE-2026-63952 — kernel: memfd: deny writeable mappings when implying SEAL_WRITE CVE-2026-64017 — kernel: blk-mq: pop cached request if it is usable CVE-2026-64219 — kernel: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async CVE-2026-64379 — kernel: smb: client: mask server-provided mode to 07777 in modefromsid CVE-2026-64382 — kernel: smb: client: fix double-free in SMB2_open() replay CVE-2026-64386 — kernel: smb: client: fix query_info() replay double-free CVE-2026-64560 — kernel: posix-cpu-timers: Prevent UAF caused by non-leader exec() race CVE-2026-68388 — kernel: smb/client: handle overlapping allocated ranges in fallocate CVE-2026-74580 — kernel: vhost: reset the vring metadata cache on vring reconfiguration

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • Red Hat Enterprise Linux Real Time (v. 10)
  • Red Hat Enterprise Linux Real Time for NFV (v. 10)
  • kernel-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.49.1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.49.1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.49.1.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.49.1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-core-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-core-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux Real Time (v. 10)
  • kernel-64k-debug-devel-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-devel-matched-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-modules-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-modules-core-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-modules-extra-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux Real Time (v. 10)
  • kernel-64k-devel-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-devel-matched-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-modules-0:6.12.0-211.49.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • +170 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Workaround: To mitigate this issue, prevent the `amdkfd` kernel module from loading if it is not required. This can be achieved by blacklisting the module. 1. Create a new file `/etc/modprobe.d/blacklist-amdkfd.conf` with the following content: `blacklist amdkfd` 2. Regenerate the initramfs to ensure the blacklist is applied during boot: `sudo dracut -f -v` (for RHEL 8/9) `sudo mkinitrd -f -v /boot/initramfs-$(uname -r).img $(uname -r)` (for RHEL 7) 3. Reboot the system for the changes to take effect. Note: Blacklisting the `amdkfd` module may impact functionality that relies on the AMD KFD driver, such as certain AMD GPU compute features. Evaluate the necessity of this module before applying the mitigation. Workaround: To mitigate this vulnerability, prevent the amdgpu kernel module from loading if AMD GPU hardware is not required on the system. 1. Create a configuration file in `/etc/modprobe.d/` to blacklist the module: ```bash echo "blacklist amdgpu" > /etc/modprobe.d/amdgpu-blacklist.conf echo "install amdgpu /bin/true" >> /etc/modprobe.d/amdgpu-blacklist.conf ``` 2. If the module is already loaded, unload it or reboot the machine: ```bash rmmod amdgpu ``` Caveats: Disabling the `amdgpu` driver will prevent graphical output, video acceleration, and compute functionality on systems equipped with AMD Radeon graphics hardware. Warning: Unloading active kernel modules or applying configuration changes may require a full system restart to take effect if the driver is currently in use by the display server or running applications. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: To mitigate this vulnerability, prevent the `cifs` kernel module from being loaded if SMB/CIFS network file systems are not required. 1. Add the module to the modprobe blacklist configuration: # echo "install cifs /bin/true" >> /etc/modprobe.d/disable-cifs.conf # echo "blacklist cifs" >> /etc/modprobe.d/disable-cifs.conf 2. If the module is currently loaded, unmount all active CIFS shares and unload the module: # modprobe -r cifs Caveats: Disabling the module prevents the system from mounting or accessing remote SMB/CIFS file shares. If the module cannot be unloaded immediately due to active usage, a system restart will be required for the configuration to take effect. Workaround: Prevent the vhost kernel module from loading on systems where kernel-accelerated virtio is not required. 1. Add a configuration entry in /etc/modprobe.d to disable autoloading: # echo "install vhost /bin/true" > /etc/modprobe.d/disable-vhost.conf 2. If the module is already loaded and no guests are using it, unload the vhost drivers: # modprobe -r vhost_net vhost_vsock vhost_scsi vhost Caveats: Disabling vhost prevents in-kernel acceleration for virtio networking, storage, and vsock communication, which may degrade I/O performance or cause virtual machine instances dependent on vhost devices to fail to start. Warning: A system reboot or stopping active virtual machines is required if the driver is currently loaded and actively in use.

🔗 References (27)