media: cec: stm32: prevent out-of-bounds write on RX overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89725
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:02 UTC
Updated2026-09-11 20:20:02 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d69ae57453c80a2193bcdb3fd762efbec447eecf c3edd7fb8e3692423a702705509947fc9c30b3d1 git Not specified
CNA Linux Linux affected d69ae57453c80a2193bcdb3fd762efbec447eecf 0c260d3f97e52978a8c769bb095ac0901333a3ac git Not specified
CNA Linux Linux affected d69ae57453c80a2193bcdb3fd762efbec447eecf a85ce3b175615c2e13bc01e8a1b6b6b6910fde57 git Not specified
CNA Linux Linux affected d69ae57453c80a2193bcdb3fd762efbec447eecf fb9dda38d4b9e90db07ed9a0ee2d35bf85494035 git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fb9dda38d4b9e90db07ed9a0ee2d35bf85494035 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c260d3f97e52978a8c769bb095ac0901333a3ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a85ce3b175615c2e13bc01e8a1b6b6b6910fde57 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3edd7fb8e3692423a702705509947fc9c30b3d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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