CVE-2026-89866: media: chips-media: wave5: Resume device before setting EOS flag

CVE-2026-89866: media: chips-media: wave5: Resume device before setting EOS flag

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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().

The Linux kernel CVE team has assigned CVE-2026-89866 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.8 with commit 9707a6254a8a6b978bde811a44fe07d86c229d1c and fixed in 7.2.5 with commit 2215e55ee1e5e69ad53862d968360c5aa63dd3a7
	Issue introduced in 6.8 with commit 9707a6254a8a6b978bde811a44fe07d86c229d1c and fixed in 7.3-rc1 with commit a52e6f7923c17a672135b485ffd96fbd72f46267

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-89866
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/2215e55ee1e5e69ad53862d968360c5aa63dd3a7
	https://git.kernel.org/stable/c/a52e6f7923c17a672135b485ffd96fbd72f46267