CVE-2021-47475
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
comedi: vmk80xx: fix transfer-buffer overflows
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 vmk80xx_cnt_insn_read() for the VMK8061_MODEL) 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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 5229159f1d052821007aff1a1beb7873eacf1a9f | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | ec85bcff4ed09260243d8f39faba99e1041718ba | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 7a2021b896de1ad559d33b5c5cdd20b982242088 | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 199acd8c110e3ae62833c24f632b0bb1c9f012a9 | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 33d7a470730dfe7c9bfc8da84575cf2cedd60d00 | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 278484ae93297b1bb1ce755f9d3b6d95a48c7d47 | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | 06ac746d57e6d32b062e220415c607b7e2e0fa50 | Unavailable | None listed |
| 985cafccbf9b7f862aa1c5ee566801e18b5161fb | affected | git | a23461c47482fc232ffc9b819539d1f837adf2b1 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 2.6.31 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 2.6.31 | Unavailable | None listed |
| 4.4.292 | unaffected | semver | Unavailable | 4.4.* | None listed |
| 4.9.290 | unaffected | semver | Unavailable | 4.9.* | None listed |
| 4.14.255 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.217 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.159 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.79 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.14.18 | unaffected | semver | Unavailable | 5.14.* | None listed |
| 5.15.2 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 5.16 | unaffected | original_commit_for_fix | Unavailable | * | None listed |