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CVE-2026-68368— usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()

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ncm_unwrap_ntb()函数未正确验证数据报边界，可能导致恶意USB主机通过构造恶意NTB触发内核内存信息泄露。

AI Predicted 8.2 Difficulty: Moderate EPSS 0.21% · P11

Affected Version Matrix 34

VendorProduct Version RangeStatus
Linux Linux 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< 35d15bbaec0557330e774ec31412ef508de6e0e0 affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< 6b2be489eaa6293e60549005d91f15ceb150510f affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< f87ed889f0f7417b8938c98d8833f559b755373c affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< fff1059d139ef798bab917990524faaf25854ca8 affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< 40c706a0224bde194667e3378c689b542fec4b44 affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c affected
2b74b0a04d3e9f9f08ff026e5663dce88ff94e52< 1febec7e47cdcd01f43fb0211094e3010474666e affected
… +26 more rows
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I. Basic Information for CVE-2026-68368

Vulnerability Information
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Vulnerability Title
usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb() When unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length against frame_max but does not verify that the datagram fits within the declared block length. Additionally, when decoding multiple NTBs from a single socket buffer, subsequent block lengths are not checked against the actual remaining buffer data. With these checks missing, a malicious USB host can specify datagram offsets and lengths that point beyond the block, or supply secondary NTB headers declaring lengths larger than the buffer. skb_put_data() then copies adjacent kernel memory from skb_shared_info into the network skb. Fix this by verifying that sufficient buffer space remains for the NTB header before parsing, handling zero-length block declarations, ensuring that block lengths never exceed the remaining buffer space, and verifying that each datagram payload stays strictly within the block boundary.
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ncm_unwrap_ntb()函数未正确验证数据报边界，可能导致恶意USB主机通过构造恶意NTB触发内核内存信息泄露。
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 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ~ 35d15bbaec0557330e774ec31412ef508de6e0e0 -
Linux Linux 5.9 -

II. Public POCs for CVE-2026-68368

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III. Intelligence Information for CVE-2026-68368

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Patches & Fixes for CVE-2026-68368 (8)

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

CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
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-2026-68156 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-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
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-2026-68368

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