SB20260925227 - Red Hat Enterprise Linux 9 update for kernel
Published: September 25, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 17 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-53290)
CWE-ID: CWE-416 - Use After Free
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 execute arbitrary code or cause a denial of service.
The vulnerability exists due to use-after-free in xe_eu_stall_stream_close() when closing an eu stall stream. A local user can trigger the close path to execute arbitrary code or cause a denial of service.
2) Use-after-free (CVE-ID: CVE-2026-80714)
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 ipvs connection handling logic when binding synced connections to a destination. A local user can trigger creation and expiry of a crafted synced connection state to cause a denial of service.
The issue occurs when a synced connection inherits the one-packet flag after it is already hashed, which can leave stale hash nodes pointing to a freed struct ip_vs_conn.
3) Use-after-free (CVE-ID: CVE-2026-68273)
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 use-after-free and NULL pointer dereference in the amdgpu context pstate handling code when initializing or finalizing GPU contexts while stable pstate state changes are processed. A local user can create and tear down crafted contexts to cause a denial of service.
The issue arises because context pstate ownership transitions were not consistently protected by the stable_pstate_ctx_lock, and sysfs-triggered state changes can race with context handling.
4) Use-after-free (CVE-ID: CVE-2026-68266)
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 use-after-free in the xe dma-buf imported buffer object handling when tearing down imported buffer objects after dma_buf_dynamic_attach() or buffer object creation fails. A local user can trigger creation of a crafted imported dma-buf buffer object to cause a denial of service.
The issue can be reached on failure paths where the buffer object already references the exporter's reservation object and that reservation object is later accessed asynchronously during delayed deletion.
5) Improper access control (CVE-ID: CVE-2026-68267)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass register access restrictions.
The vulnerability exists due to improper access control in the OA register whitelist handling in the xe DRM driver when initializing or resetting whitelist entries. A local user can access OA registers through non-privileged slots to bypass register access restrictions.
The issue can occur after probe, GT reset, resume, and engine reset.
6) Integer overflow (CVE-ID: CVE-2026-68257)
CWE-ID: CWE-190 - Integer overflow
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 integer overflow in drm/amdkfd queue buffer handling in kfd_queue_acquire_buffers() and kfd_queue_release_buffers() when calculating the CWSR save area size. A local user can provide crafted queue properties with large ctx_save_restore_area_size values to cause a denial of service.
The issue can result in an undersized CWSR save area that firmware later overruns.
7) Integer overflow (CVE-ID: CVE-2026-68108)
CWE-ID: CWE-190 - Integer overflow
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 out-of-bounds memory access.
The vulnerability exists due to integer overflow in amdgpu_vce_ring_parse_cs() in the VCE command stream parser when processing crafted VCE command streams with oversized image dimensions. A local user can submit a specially crafted command stream to cause out-of-bounds memory access.
The issue occurs when image dimensions wrap the calculated buffer size and bypass validation before reaching the GPU firmware.
8) Use-after-free (CVE-ID: CVE-2026-68121)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to a use-after-free in pppoe_sendmsg() when handling a blocked send while a non-Ethernet port is added to an empty team device. A local user can trigger skb head reallocation and subsequent writes through a stale PPPoE header pointer to cause memory corruption.
The issue occurs because device header callbacks may reallocate the skb head and invalidate saved pointers into it.
9) Improper locking (CVE-ID: CVE-2026-64098)
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 lock handling in virtio_gpu_cursor_plane_update() and virtio_gpu_resource_flush() when updating planes and flushing framebuffer resources. A local user can trigger error conditions that leave the dma_resv lock unheld and then reach fence-list updates to cause a denial of service.
The issue can race with concurrent readers or writers and corrupt the dma_resv fence list. The reported trigger used fault injection on the DRM_IOCTL_MODE_CURSOR path.
10) Use-after-free (CVE-ID: CVE-2025-40323)
CWE-ID: CWE-416 - Use After Free
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 escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the include/linux/fbcon.h. A local user can escalate privileges on the system.
11) Heap-based buffer overflow (CVE-ID: CVE-2026-53203)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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 heap-based buffer overflow in the ivpu_ms_get_info_ioctl function when processing a metric stream info query from firmware and copying the returned data into an allocated buffer. A local user can trigger the metric stream info query with a returned size larger than the allocated buffer to cause a denial of service.
The issue involves the accel/ivpu driver metric stream get_info ioctl path.
12) Use-after-free (CVE-ID: CVE-2026-52912)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in nf_queue when reinjecting queued bridge LOCAL_IN packets. A remote attacker can trigger packet queueing and later reinjection to cause a denial of service.
The issue occurs because skb->dev can still reference a freed bridge master device while the packet remains queued.
13) Race condition (CVE-ID: CVE-2026-46311)
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 locking in drm/amdgpu user queue handling in drivers/gpu/drm/amd/amdgpu/mes_userqueue.c when creating a user queue and accessing the wptr mapping. A local user can trigger queue creation while unmapping the wptr object and reusing another buffer object at the same address to cause a denial of service.
The issue involves stale wptr mapping access during queue creation.
14) Out-of-bounds read (CVE-ID: CVE-2026-46199)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in the drm/amdgpu vcn4 decoder message parser when parsing a decoder message from a buffer object. A local user can provide a specially crafted decoder message to disclose sensitive information.
15) Out-of-bounds read (CVE-ID: CVE-2026-46204)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in the amdgpu vcn4 IB parser when parsing IB data. A local user can provide a specially crafted IB to disclose sensitive information.
16) Out-of-bounds read (CVE-ID: CVE-2026-46230)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the amdgpu vcn3 decoder message parser when parsing decoder messages from a buffer object. A local user can supply a specially crafted decoder message to disclose sensitive information.
17) Race condition (CVE-ID: CVE-2026-31539)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a race condition in smbdirect credit management when processing incoming SMB Direct receive operations. A remote attacker can send network traffic that triggers incorrect credit granting to cause a denial of service.
Remediation
Install update from vendor's website.