Bug 2513379 (CVE-2026-68305)

Summary: CVE-2026-68305 kernel: drm/xe/vf: Add drm_dev guards when detaching CCS read/write buffers
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's Direct Rendering Manager (DRM) subsystem. This vulnerability arises when graphics buffer objects are deallocated prematurely while the DRM structure remains active. This can lead to a null pointer dereference when the system attempts to access these freed resources. A local attacker could exploit this to cause a system crash, resulting in a denial of service.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-10 12:34:08 UTC
In the Linux kernel, the following vulnerability has been resolved:

drm/xe/vf: Add drm_dev guards when detaching CCS read/write buffers

CCS read/write buffers are freed during BO destruction. In some cases,
BOs may be destroyed after the device is unbound but while the DRM
structure remains valid, leading to NULL pointer dereferences when
accessing device resources.

BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: Oops: 0000 [#1] SMP NOPTI
CPU: 0 UID: 0 PID: 9376 Comm: xe_pat Not tainted 7.2.0-rc2+ #1 PREEMPT(lazy)
RIP: 0010:xe_sriov_vf_ccs_rw_update_bb_addr+0x4d/0xa0 [xe]
RSP: 0018:ffffcf304110b9c8 EFLAGS: 00010246
RAX: ffff8a85c38a0a00 RBX: 00000000810ef000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8a85c39c1888
RBP: ffffcf304110b9e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8a85c39c1888
R13: 0000000000000000 R14: ffff8a85c39b4f28 R15: ffff8a85c3885000
FS:  0000000000000000(0000) GS:ffff8a878b809000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010314a002 CR4: 0000000000772ef0
PKRU: 55555554
Call Trace:
 <TASK>
 xe_migrate_ccs_rw_copy_clear+0x98/0x120 [xe]
 xe_sriov_vf_ccs_detach_bo+0x2c/0x60 [xe]
 xe_ttm_bo_delete_mem_notify+0xc8/0xe0 [xe]
 ttm_bo_cleanup_memtype_use+0x26/0x80 [ttm]
 ttm_bo_release+0x29e/0x2d0 [ttm]
 ttm_bo_fini+0x39/0x70 [ttm]
 xe_gem_object_free+0x1f/0x30 [xe]
 drm_gem_object_free+0x1d/0x40
 ttm_bo_vm_close+0x5f/0x90 [ttm]
 remove_vma+0x2c/0x70
 tear_down_vmas+0x63/0xf0
 exit_mmap+0x20d/0x3f0
 __mmput+0x45/0x170
 mmput+0x31/0x40
 do_exit+0x2ba/0xac0
 do_group_exit+0x2d/0xb0
 __x64_sys_exit_group+0x18/0x20
 x64_sys_call+0x14a0/0x2390
 do_syscall_64+0xdd/0x640
 ? count_memcg_events+0xea/0x240
 ? handle_mm_fault+0x1ec/0x2f0

(cherry picked from commit 1ae415a6eefe5004954a1d352b1718faca8844ef)