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CVE-2026-68209— media: sun4i-csi: Return queued buffers on start_streaming() failure

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.4版本存在安全漏洞，该漏洞源于drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c文件中的sun4i-csi驱动在start_streaming()失败时未正确返回排队缓冲区，可能导致缓冲区泄漏。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 577bbf23b758848f0c4a50d346460b690c753024< 29fce7bcb3b959f6d4fdcdff7d26330152fdf98d affected
577bbf23b758848f0c4a50d346460b690c753024< 7c2c30e282745a83d332c3cf92d1c0bcc491ac54 affected
577bbf23b758848f0c4a50d346460b690c753024< 3c0bd793b0083fd4639ba7f60d1e7db8c8ac459a affected
577bbf23b758848f0c4a50d346460b690c753024< 4872161e6fbe4e1783daea8bff79caddfae0fb82 affected
577bbf23b758848f0c4a50d346460b690c753024< a8abecc638a7feb20b78fabd563b05e30c071331 affected
577bbf23b758848f0c4a50d346460b690c753024< b5184b3f0e9d4cc47059ba1138c9a73d43d2493f affected
577bbf23b758848f0c4a50d346460b690c753024< 668face37fdb6b6900645dc8777195498541c9a7 affected
577bbf23b758848f0c4a50d346460b690c753024< bbba3e260a62810a717b4442a3bb96d0ec0f6309 affected
… +10 more rows
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I. Basic Information for CVE-2026-68209

Vulnerability Information
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Vulnerability Title
media: sun4i-csi: Return queued buffers on start_streaming() failure
Source: CVE Program / CVE List V5
Vulnerability 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").
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.4版本存在安全漏洞，该漏洞源于drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c文件中的sun4i-csi驱动在start_streaming()失败时未正确返回排队缓冲区，可能导致缓冲区泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 577bbf23b758848f0c4a50d346460b690c753024 ~ 29fce7bcb3b959f6d4fdcdff7d26330152fdf98d -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-68209

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III. Intelligence Information for CVE-2026-68209

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Patches & Fixes for CVE-2026-68209 (8)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68209

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