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CVE-2026-68278— drm/dp/mst: fix buffer overflows in sideband chunk accumulation

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_sideband_append_payload()函数在处理设备提供的sideband回复数据时存在缓冲区溢出，可能导致越界读写。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.24% · P15

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ad7f8a1f9ced7f049f9b66d588723f243a7034cd< ef2ecb6cf268debf3890df99fea01b6452dcf78e affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< d4e05dedb252ed3e540a0c9be511e427f098110a affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 4d5109075a787de28c9e89940f9dee45269f91fa affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 53937a2787d29c7a460e984dc4f20ff6ac91dc65 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< ef0dbcc200c3389f1f781ab181932a97e54b51af affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 1e5827839ad0ceb0079d1560c321fa3656b54f21 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< a6366b551079c79bf7bdbadd74c97358bcfe2d58 affected
ad7f8a1f9ced7f049f9b66d588723f243a7034cd< 55bd5e685bda455b9b50c835f8c8442d52a344a3 affected
… +10 more rows
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I. Basic Information for CVE-2026-68278

Vulnerability Information
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Vulnerability Title
drm/dp/mst: fix buffer overflows in sideband chunk accumulation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix buffer overflows in sideband chunk accumulation drm_dp_sideband_append_payload() has three related bugs when processing device-provided sideband reply data: 1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken directly from the DP sideband header. If a device sends msg_len=0, curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len) is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow). drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy() writes 255 bytes into msg[], both far out of bounds. 2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks until curchunk_idx reaches curchunk_len, writing up to 15 bytes past the end of chunk[] into msg[]. 3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256], so the memcpy can spill into adjacent struct fields. All three are reachable from any DP MST device that can forge sideband reply messages on a physical connection.
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_sideband_append_payload()函数在处理设备提供的sideband回复数据时存在缓冲区溢出，可能导致越界读写。
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 ~ ef2ecb6cf268debf3890df99fea01b6452dcf78e -
Linux Linux 3.17 -

II. Public POCs for CVE-2026-68278

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III. Intelligence Information for CVE-2026-68278

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Patches & Fixes for CVE-2026-68278 (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-2026-68278

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