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CVE-2026-80749— drm/connector/hdmi: Fix out of bounds memory read

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 6.11版本存在安全漏洞，该漏洞源于drm/connector/hdmi中复制音频infoframe时错误使用了目标大小而非源大小，导致越界内存读取，可能引发内存访问违规。

CVSS 7.1 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1202 · Indirect Command Execution

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f378b77227bc4732922c57f92be89438bb1018a1< d9f7454c185c0c7f0973e11d62ad6c06862c324c affected
f378b77227bc4732922c57f92be89438bb1018a1< e5b527804a1ea4f70e139179d3062cf5de8c06ab affected
f378b77227bc4732922c57f92be89438bb1018a1< f72bb95732bc5ca87b50c52c8f087ba501950809 affected
f378b77227bc4732922c57f92be89438bb1018a1< 9ecf8ba763d0ffe0673538eb4bf7806f20455d19 affected
6.11 affected
< 6.11 unaffected
6.12.105≤ 6.12.* unaffected
6.18.46≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-80749

Vulnerability Information
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Vulnerability Title
drm/connector/hdmi: Fix out of bounds memory read
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/connector/hdmi: Fix out of bounds memory read A helper function was copying a given audio infoframe into the connector's copy but using the size of the destination (a generic target, sized to accept many different data blocks) not the source (a very specific type of data block). Thus, it was copying 60 bytes of data from a 28 byte allocation. Fix that by using the source size instead, together with a build bug on the source size actually being smaller than the destination. I hit this running KUnit tests under KASAN (while debugging something else entirely). In the real world, it seems unlikely to cause an actual problem. It is a read not a write so it can't corrupt any memory. However, it could potentially fall off the end of a page and cause an accvio bug.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 6.11版本存在安全漏洞，该漏洞源于drm/connector/hdmi中复制音频infoframe时错误使用了目标大小而非源大小，导致越界内存读取，可能引发内存访问违规。
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 f378b77227bc4732922c57f92be89438bb1018a1 ~ d9f7454c185c0c7f0973e11d62ad6c06862c324c -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-80749

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III. Intelligence Information for CVE-2026-80749

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Patches & Fixes for CVE-2026-80749 (4)

Same Patch Batch · Linux · 2026-09-03 · 32 CVEs total

CVE-2026-80726 9.3 CRITICAL KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page
CVE-2026-80734 8.8 HIGH btrfs: initialize inode mapping flags for cached inodes
CVE-2026-80753 8.4 HIGH ovpn: run deferred work on a module-owned workqueue
CVE-2026-80752 8.4 HIGH Input: psxpad-spi - set driver data before use
CVE-2026-80750 8.4 HIGH pmdomain: mediatek: fix remaining %pOF after of_node_put()
CVE-2026-80745 8.4 HIGH regulator: fp9931: Fix VPOS/VNEG voltage selector table
CVE-2026-80747 8.0 HIGH drm/amdkfd: Add bounds check for CRAT subtype length
CVE-2026-80737 7.8 HIGH serial: amba-pl011: synchronize DMA teardown
CVE-2026-80732 7.8 HIGH ata: pata_sl82c105: fix bridge revision use-after-free
CVE-2026-80731 7.8 HIGH net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header
CVE-2026-80736 7.8 HIGH thunderbolt: Fix bandwidth group reservation indexing
CVE-2026-80748 7.8 HIGH mmc: loongson2: Fix sg iteration in data reorder functions
CVE-2026-80751 7.8 HIGH pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()
CVE-2026-80754 7.8 HIGH Input: synaptics-rmi4 - fix F55 transmitter electrode count typo
CVE-2026-80735 7.3 HIGH ovpn: ensure socket is owned by ovpn before deref sk_user_data
CVE-2026-80738 7.3 HIGH bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie
CVE-2026-80741 7.1 HIGH drm/log: Fix out-of-bounds read on empty message length
CVE-2026-80727 x86/mce: Set up the polling timer before CMCI discovery
CVE-2026-80740 drm/log: Fix infinite loop when scale is too large for display
CVE-2026-80733 net: remove WARN_ON_ONCE() from sk_mc_loop()

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80749

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