# CVE-2026-31617: usb: gadget: f_ncm: validate minimum block_len in ncm_unwrap_ntb() CVE-2026-31617 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2026-31617, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-31617 - Priority: High - CVSS: 7.8 (Important) - EPSS: 0.0013 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 24, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31617 ## Description In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: validate minimum block_len in ncm_unwrap_ntb() The block_len read from the host-supplied NTB header is checked against ntb_max but has no lower bound. When block_len is smaller than opts->ndp_size, the bounds check of: ndp_index > (block_len - opts->ndp_size) will underflow producing a huge unsigned value that ndp_index can never exceed, defeating the check entirely. The same underflow occurs in the datagram index checks against block_len - opts->dpe_size. With those checks neutered, a malicious USB host can choose ndp_index and datagram offsets that point past the actual transfer, and the skb_put_data() copies adjacent kernel memory into the network skb. Fix this by rejecting block lengths that cannot hold at least the NTB header plus one NDP. This will make block_len - opts->ndp_size and block_len - opts->dpe_size both well-defined. Commit 8d2b1a1ec9f5 ("CDC-NCM: avoid overflow in sanity checking") fixed a related class of issues on the host side of NCM. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool ol 8 | 0:5.15.0-323.211.3.3.el9uek | [bpftool 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-bpftool-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | bpftool ol 9 | 0:5.15.0-323.211.3.3.el9uek | [bpftool 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-bpftool-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-64kb sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-azure sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-default sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-default sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23237-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23237-1.md) | Aug 11, 2026 | | Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.37.1.160000.2.19 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.73.2.150700.17.41.4 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-default-base sles 16.0 | 6.12.0-160000.37.1.160000.2.19 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.73.1 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-docs sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-livepatch-SLE15-SP7-RT_Update_18 sles 15.7 | 1-150700.1.5.1 | [SUSE-SU-2026:3130-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3130-1.md) | Jul 20, 2026 | | Linux | kernel-livepatch-SLE15-SP7_Update_19 sles 15.7 | 1-150700.15.3.4 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-source sles 15.7 | 6.4.0-150700.53.73.1 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-source sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.73.1 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-syms sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | kernel-uek ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-container ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-container 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-container-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-container ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-container 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-container-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-container-debug 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-container-debug-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-container-debug 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-container-debug-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-core ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-core 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-core-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-core ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-core 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-core-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-debug-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-debug-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-core 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-debug-core-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-core 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-debug-core-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-devel 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-debug-devel-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-devel 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-debug-devel-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-modules 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-debug-modules-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-modules 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-debug-modules-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-modules-extra 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-debug-modules-extra-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-debug-modules-extra 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-debug-modules-extra-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-devel ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-devel 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-devel-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-devel ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-devel 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-devel-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-doc ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-doc 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-doc-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-doc ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-doc 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-doc-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-modules ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-modules 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-modules-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-modules ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-modules 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-modules-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-modules-extra 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek-modules-extra-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek-modules-extra 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek-modules-extra-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek64k-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek64k-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-core ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-core 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek64k-core-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-core ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-core 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek64k-core-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-devel 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek64k-devel-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-devel 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek64k-devel-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-modules 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek64k-modules-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-modules 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek64k-modules-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-modules-extra 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-8-kernel-uek64k-modules-extra-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-323.211.3.3.el9uek | [kernel-uek64k-modules-extra 0:5.15.0-323.211.3.3.el9uek](https://patchblox.com/security/data/fix/linux/ol-9-kernel-uek64k-modules-extra-0-5.15.0-323.211.3.3.el9uek.md) | Aug 11, 2026 | | Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.37.1 | [OPENSUSE-SU-2026:21555-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21555-1.md) | Aug 12, 2026 | | Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.73.2 | [SUSE-SU-2026:3166-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3166-1.md) | Jul 21, 2026 | | Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.37.1 | [SUSE-SU-2026:23231-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23231-1.md) | Aug 11, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.176-1 | [DEBIAN-CVE-2026-31617](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31617.md) | May 15, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-31617](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31617.md) | May 15, 2026 | | Linux | linux Debian 14 | 6.19.14-1 | [DEBIAN-CVE-2026-31617](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31617.md) | May 15, 2026 | --- Data as of 2026-11-09T13:31:49Z UTC. 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