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CVE-2026-68279— drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers

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存在安全漏洞，该漏洞源于drm/dp/mst远程DPCD/I2C sideband回复解析器未检查数据长度，可能导致越界读取。

AI Predicted 7.5 Difficulty: Hard EPSS 0.18% · P8

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 185de1d74e658e2edb723ba76fa61903f77d8a68 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< d7b9b1e33b4ed8c48d4db6e6e21c257ebbbb2586 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< c2fbda0fe0163c55ba3820ee6cea0c6b43622eda affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 04d953f50d61e542e94a5977822cc53735f8c0ce affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 533d9e2bede4aeefdc2a0561d7071cfede95958f affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< e6ef5455b06cb4e5d181aabcd723791587c79f12 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 1a8f537f5a1eeac941f262fe73078d6b08ba83c0 affected
… +10 more rows
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I. Basic Information for CVE-2026-68279

Vulnerability Information
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Vulnerability Title
drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers drm_dp_sideband_parse_remote_dpcd_read() reads num_bytes from the raw message and then unconditionally does: memcpy(bytes, &raw->msg[idx], num_bytes); without checking that idx + num_bytes <= raw->curlen. raw->msg[] is 256 bytes; if a malicious or misbehaving MST hub sets num_bytes larger than the remaining payload, the memcpy reads past the received data into whatever follows in raw->msg[]. drm_dp_sideband_parse_remote_i2c_read_ack() has the same flaw (noted with a /* TODO check */ comment since the code was introduced). Fix both functions by using a single combined check (idx + num_bytes > curlen) before each memcpy. Since num_bytes is u8, it is always >= 0, so this strictly subsumes the simpler idx > curlen form and no separate step is needed. [added missing fixes tag]
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
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存在安全漏洞，该漏洞源于drm/dp/mst远程DPCD/I2C sideband回复解析器未检查数据长度，可能导致越界读取。
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 ad7f8a1f9ced7f049f9b66d588723f243a7034cd ~ 185de1d74e658e2edb723ba76fa61903f77d8a68 -
Linux Linux 3.17 -

II. Public POCs for CVE-2026-68279

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III. Intelligence Information for CVE-2026-68279

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Patches & Fixes for CVE-2026-68279 (8)

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

CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
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-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
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-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
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-2026-68124 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-2026-68279

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