CVE-2021-47267 Affecting kernel-default-livepatch-devel package, versions <5.3.18-150200.24.194.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES152-KERNELDEFAULTLIVEPATCHDEVEL-7363193
- published25 Jun 2024
- disclosed24 Jun 2024
Introduced: 24 Jun 2024
CVE-2021-47267 (opens in a new tab)How to fix?
Upgrade SLES:15.2 kernel-default-livepatch-devel to version 5.3.18-150200.24.194.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-default-livepatch-devel package and not the kernel-default-livepatch-devel package as distributed by SLES.
See How to fix? for SLES:15.2 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
usb: fix various gadget panics on 10gbps cabling
usb_assign_descriptors() is called with 5 parameters, the last 4 of which are the usb_descriptor_header for: full-speed (USB1.1 - 12Mbps [including USB1.0 low-speed @ 1.5Mbps), high-speed (USB2.0 - 480Mbps), super-speed (USB3.0 - 5Gbps), super-speed-plus (USB3.1 - 10Gbps).
The differences between full/high/super-speed descriptors are usually substantial (due to changes in the maximum usb block size from 64 to 512 to 1024 bytes and other differences in the specs), while the difference between 5 and 10Gbps descriptors may be as little as nothing (in many cases the same tuning is simply good enough).
However if a gadget driver calls usb_assign_descriptors() with a NULL descriptor for super-speed-plus and is then used on a max 10gbps configuration, the kernel will crash with a null pointer dereference, when a 10gbps capable device port + cable + host port combination shows up. (This wouldn't happen if the gadget max-speed was set to 5gbps, but it of course defaults to the maximum, and there's no real reason to artificially limit it)
The fix is to simply use the 5gbps descriptor as the 10gbps descriptor, if a 10gbps descriptor wasn't provided.
Obviously this won't fix the problem if the 5gbps descriptor is also NULL, but such cases can't be so trivially solved (and any such gadgets are unlikely to be used with USB3 ports any way).
References
- https://www.suse.com/security/cve/CVE-2021-47267.html
- https://bugzilla.suse.com/1224993
- https://git.kernel.org/stable/c/032e288097a553db5653af552dd8035cd2a0ba96
- https://git.kernel.org/stable/c/45f9a2fe737dc0a5df270787f2231aee8985cd59
- https://git.kernel.org/stable/c/5ef23506695b01d5d56a13a092a97f2478069d75
- https://git.kernel.org/stable/c/70cd19cb5bd94bbb5bacfc9c1e4ee0071699a604
- https://git.kernel.org/stable/c/b972eff874637402ddc4a7dd11fb22538a0b6d28
- https://git.kernel.org/stable/c/ca6bc277430d90375452b60b047763a090b7673e
- https://git.kernel.org/stable/c/fd24be23abf3e94260be0f00bb42c7e91d495f87