Kernel memory disclosure via unchecked NTB bounds
Published Aug 10, 2026 · Updated Aug 10, 2026
Out-of-bounds read in the Linux kernel USB gadget NCM driver allows physically proximate attackers to disclose adjacent kernel memory. ncm_unwrap_ntb() accepts datagram and secondary block lengths beyond the declared or remaining buffer, after which skb_put_data() copies data from skb_shared_info. Exploitation requires a malicious USB host connected to a system exposing the NCM gadget function; the demonstrated consequence is kernel-memory disclosure.
Summary
What happened
Out-of-bounds read in the Linux kernel USB gadget NCM driver allows physically proximate attackers to disclose adjacent kernel memory. ncm_unwrap_ntb() accepts datagram and secondary block lengths beyond the declared or remaining buffer, after which skb_put_data() copies data from skb_shared_info. Exploitation requires a malicious USB host connected to a system exposing the NCM gadget function; the demonstrated consequence is kernel-memory disclosure.
The record
- CVE
- CVE-2026-68368
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 <1febec7e47cdcd01f43fb0211094e3010474666e
- Affected versionversion=2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 <40c706a0224bde194667e3378c689b542fec4b44
- Affected versionversion=2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 <41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c
- Affected versionversion=2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 <e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f
- Affected versionversion=2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 <fff1059d139ef798bab917990524faaf25854ca8
- Affected versionversion=4.14.196 <4.15
- Affected versionversion=4.14.328 <4.15
- Affected versionversion=4.19.143 <4.20
- Affected versionversion=4.19.297 <4.20
- Affected versionversion=471b23586387a32857778c511be60ab31c98dcfd
- Affected versionversion=4.9.235 <4.10
- Affected versionversion=4f529c4d1e436230d3af7c09a3239677a14d2b46
- Affected versionversion=5.4.259 <5.5
- Affected versionversion=5.4.62 <5.5
- Affected versionversion=5.8.6 <5.9
- Affected versionversion=5.9
- Affected versionversion=5bdf93a2f5459f944b416b188178ca4a92fd206f
- Affected versionversion=ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8
- Affected versionversion=b88ad6e714284b33a47834f5f2a294c2b37c66aa
- Affected versionversion=e7ca00f35d8a17af1ae19d529193ebc21bfda164
- Affected versionversion=f7e0611e207d8908c4f2858e244370529a76dbf7
- Affected versionversion=ff3ba016263ee93a1c6209bf5ab1599de7ab1512
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
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