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CVE-2026-89725— media: cec: stm32: prevent out-of-bounds write on RX overflow

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.

在 Linux 内核中，以下漏洞已得到修复： media: cec: stm32: 防止接收溢出时的越界写 函数使用 作为写入索引，将每个接收到的 CEC 字节追加到 中，并在每次 RXBR（接收字节就绪）中断时递增该索引，但未对其与缓冲区大小进行校验： 其中， 是 中固定大小为 （16 字节）的数组，而 仅在 RXACKE/RXOVR 或消息接收完成（RXEND）时才会被重置。在 RXEND 之前接收到的字节数量由远端 CEC 设备决定（由其设置 EOM），而非由驱动程序控制。如果对端设备持续发送字节且不结束消息

AI Predicted 5.3 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1201 · Password Policy Discovery

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux d69ae57453c80a2193bcdb3fd762efbec447eecf< c3edd7fb8e3692423a702705509947fc9c30b3d1 affected
d69ae57453c80a2193bcdb3fd762efbec447eecf< 0c260d3f97e52978a8c769bb095ac0901333a3ac affected
d69ae57453c80a2193bcdb3fd762efbec447eecf< a85ce3b175615c2e13bc01e8a1b6b6b6910fde57 affected
d69ae57453c80a2193bcdb3fd762efbec447eecf< fb9dda38d4b9e90db07ed9a0ee2d35bf85494035 affected
4.13 affected
< 4.13 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89725

Vulnerability Information
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Vulnerability Title
media: cec: stm32: prevent out-of-bounds write on RX overflow
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: cec: stm32: prevent out-of-bounds write on RX overflow stm32_rx_done() appends each received CEC byte to rx_msg.msg[] using rx_msg.len as the write index, incrementing it on every RXBR (receive-byte-ready) interrupt without checking it against the buffer size: cec->rx_msg.msg[cec->rx_msg.len++] = val & 0xFF; rx_msg.msg[] is a fixed CEC_MAX_MSG_SIZE (16) byte array in struct cec_msg, and rx_msg.len is only reset on RXACKE/RXOVR or after a completed message (RXEND). The number of bytes received before RXEND is decided by the remote CEC device (it sets EOM), not by the driver. A peer that keeps sending bytes without ending the message drives RXBR repeatedly, pushing rx_msg.len past 16 and writing peer-controlled bytes out of bounds into the surrounding memory. This is reachable in normal operation once the driver has probed and receiving is enabled, from the IRQ thread, without any local privilege. The length check in the CEC core runs on the consumer side, after the byte has been stored, so it does not prevent the overflow. Bound the index in the driver before the store, as the other platform CEC drivers already do (e.g. tegra_cec), dropping the excess bytes of an overlong frame. Found by static analysis tool CodeQL.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux d69ae57453c80a2193bcdb3fd762efbec447eecf ~ c3edd7fb8e3692423a702705509947fc9c30b3d1 -
Linux Linux 4.13 -

II. Public POCs for CVE-2026-89725

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III. Intelligence Information for CVE-2026-89725

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Patches & Fixes for CVE-2026-89725 (3)

Other References for CVE-2026-89725 (1)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89725

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