CVE-2026-68209: Linux Vulnerability (CVSS 7.8)

Description

In the Linux kernel, the following vulnerability has been resolved: media: sun4i-csi: Return queued buffers on start_streaming() failure The vb2 framework hands buffers to the driver via buf_queue() before calling start_streaming(). If start_streaming() returns an error without first returning those buffers via vb2_buffer_done(), vb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued buffers leak. sun4i_csi_start_streaming() returned -EINVAL when no matching CSI format could be found, before any setup (scratch buffer allocation, pipeline start) had been performed. The remaining error paths already converge on the err_clear_dma_queue label, which calls return_all_buffers(..., VB2_BUF_STATE_QUEUED) under csi->qlock. Jump to that label directly: the intermediate err_disable_device / err_disable_pipeline / err_free_scratch_buffer labels are skipped, which is correct because nothing they would undo has happened yet. This mirrors the uvcvideo fix in commit 4cf3b6fd54eb ("media: uvcvideo: Return queued buffers on start_streaming() failure").

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.18%

7.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 577bbf23b758848f0c4a50d346460b690c753024, < 29fce7bcb3b959f6d4fdcdff7d26330152fdf98d; >= 577bbf23b758848f0c4a50d346460b690c753024, < 7c2c30e282745a83d332c3cf92d1c0bcc491ac54; >= 577bbf23b758848f0c4a50d346460b690c753024, < 3c0bd793b0083fd4639ba7f60d1e7db8c8ac459a; >= 577bbf23b758848f0c4a50d346460b690c753024, < 4872161e6fbe4e1783daea8bff79caddfae0fb82; >= 577bbf23b758848f0c4a50d346460b690c753024, < a8abecc638a7feb20b78fabd563b05e30c071331; >= 577bbf23b758848f0c4a50d346460b690c753024, < b5184b3f0e9d4cc47059ba1138c9a73d43d2493f; >= 577bbf23b758848f0c4a50d346460b690c753024, < 668face37fdb6b6900645dc8777195498541c9a7; >= 577bbf23b758848f0c4a50d346460b690c753024, < bbba3e260a62810a717b4442a3bb96d0ec0f6309
Linux	Linux	5.4

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 19, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-68209?

In the Linux kernel, the following vulnerability has been resolved: media: sun4i-csi: Return queued buffers on start_streaming() failure The vb2 framework hands buffers to the driver via buf_queue() before calling start_streaming(). If start_streaming() returns an error without first returning those buffers via vb2_buffer_done(), vb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued buffers leak. sun4i_csi_start_streaming() returned -EINVAL when no matching CSI format could be found, before any setup (scratch buffer allocation, pipeline start) had been performed. The remaining error paths already converge on the err_clear_dma_queue label, which calls return_all_buffers(..., VB2_BUF_STATE_QUEUED) under csi->qlock. Jump to that label directly: the intermediate err_disable_device / err_disable_pipeline / err_free_scratch_buffer labels are skipped, which is correct because nothing they would undo has happened yet. This mirrors the uvcvideo fix in commit 4cf3b6fd54eb ("media: uvcvideo: Return queued buffers on start_streaming() failure").

How severe is CVE-2026-68209?

CVE-2026-68209 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-68209?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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