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CVE-2026-68277— drm/dp/mst: fix OOB reads on 2-byte fields in 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drivers/gpu/drm/display/drm_dp_mst_topology.c中drm_dp_sideband_parse_enum_path_resources_ack、drm_dp_sideband_parse_allocate_payload_ack和drm_dp_sideband_parse_query_payload_ack解析器读取16位字段时未正确检查边界，可能

AI Predicted 7.8 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ad7f8a1f9ced7f049f9b66d588723f243a7034cd< c1f72a13d54ffd16647d3fa540d961f5deba8790 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 192e146c2d57ad033b0d418ec64ee390f8dc074e affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 6e3107e6522109a07fc9bb0fc4ec463f1982e113 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< bdf0508b1e6785d4a8982c637e97e68d60b47d7b affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< d5c70523cafa26ad2c7a37b612849abe2683baa8 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 6b89ba3dba2f583626fb693e47e951ffb8bf591f affected
… +10 more rows
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I. Basic Information for CVE-2026-68277

Vulnerability Information
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Vulnerability Title
drm/dp/mst: fix OOB reads on 2-byte fields in 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 on 2-byte fields in sideband reply parsers Three sideband reply parsers read 16-bit fields as: val = (raw->msg[idx] << 8) | (raw->msg[idx+1]); and check bounds only after the fact. When idx == raw->curlen, raw->msg[idx+1] reads one byte past the received message data into the following struct fields (curchunk_len, curchunk_idx, curlen). Affected functions: - drm_dp_sideband_parse_enum_path_resources_ack() full_payload_bw_number and avail_payload_bw_number fields - drm_dp_sideband_parse_allocate_payload_ack() allocated_pbn field - drm_dp_sideband_parse_query_payload_ack() allocated_pbn field Fix by using a single combined check (idx + 2 > curlen) before each 2-byte read. Since the check is strictly tighter than idx > curlen, no separate step is needed. [added 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drivers/gpu/drm/display/drm_dp_mst_topology.c中drm_dp_sideband_parse_enum_path_resources_ack、drm_dp_sideband_parse_allocate_payload_ack和drm_dp_sideband_parse_query_payload_ack解析器读取16位字段时未正确检查边界，可能
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 ~ c1f72a13d54ffd16647d3fa540d961f5deba8790 -
Linux Linux 3.17 -

II. Public POCs for CVE-2026-68277

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III. Intelligence Information for CVE-2026-68277

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Patches & Fixes for CVE-2026-68277 (6)

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-2026-68277

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