Bug 2535385 (CVE-2026-89866)

Summary:	CVE-2026-89866 kernel: media: chips-media: wave5: Resume device before setting EOS flag
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	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 `chips-media: wave5` driver. This vulnerability occurs when the End-Of-Stream (EOS) flag is set while the video processing unit (VPU) device is in a suspended state. This improper handling of device power states can lead to an attempt to access powered-down hardware. A local attacker could exploit this to trigger a kernel panic, resulting in a system crash and a denial of service (DoS).	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 2026-09-16 12:29:06 UTC

In the Linux kernel, the following vulnerability has been resolved:

media: chips-media: wave5: Resume device before setting EOS flag

Setting the EOS flag talks to the firmware via send_firmware_command(),
which accesses VPU registers. Both the STREAMOFF path
(wave5_vpu_dec_job_abort()) and the V4L2_DEC_CMD_STOP path
(wave5_vpu_dec_stop()) can run while the device is runtime suspended, so
those register accesses hit powered-down hardware and the SoC raises an
asynchronous SError, panicking the kernel:

  SError Interrupt on CPU3, code 0x00000000bf000000 -- SError
   send_firmware_command+0x2c/0x160 [wave5]
   wave5_vpu_dec_set_bitstream_flag+0x6c/0x80 [wave5]
   wave5_vpu_dec_update_bitstream_buffer+0x80/0xec [wave5]
   wave5_vpu_dec_job_abort+0x44/0xa0 [wave5]
   v4l2_m2m_cancel_job+0x110/0x19c [v4l2_mem2mem]
   v4l2_m2m_streamoff+0x24/0x140 [v4l2_mem2mem]

Resume the device with pm_runtime_resume_and_get() around the EOS
firmware command and release it with pm_runtime_put_autosuspend(),
matching the runtime PM handling already done in
wave5_vpu_dec_device_run().

Comment 1 Mauro Matteo Cascella 2026-09-17 13:14:12 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89866.mbox