CVE-2021-47475
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47475
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47475.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47475
- Related
- Published
- 2024-05-22T09:15:09Z
- Modified
- 2024-09-11T04:41:12.044844Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
comedi: vmk80xx: fix transfer-buffer overflows
The driver uses endpoint-sized USB transfer buffers but up until recently had no sanity checks on the sizes.
Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize of usb endpoints found") inadvertently fixed NULL-pointer dereferences when accessing the transfer buffers in case a malicious device has a zero wMaxPacketSize.
Make sure to allocate buffers large enough to handle also the other accesses that are done without a size check (e.g. byte 18 in vmk80xxcntinsnread() for the VMK8061MODEL) to avoid writing beyond the buffers, for example, when doing descriptor fuzzing.
The original driver was for a low-speed device with 8-byte buffers. Support was later added for a device that uses bulk transfers and is presumably a full-speed device with a maximum 64-byte wMaxPacketSize.
- References
-
- https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50
- https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9
- https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47
- https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00
- https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7
- https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f
- https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088
- https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1
- https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba
- https://security-tracker.debian.org/tracker/CVE-2021-47475
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source