Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: comedi: Fix initialization of data for instructions that write to subdevice Some Comedi subdevice instruction handlers are known to access instruction data elements beyond the first `insn->n` elements in some cases. The `do_insn_ioctl()` and `do_insnlist_ioctl()` functions allocate at least `MIN_SAMPLES` (16) data elements to deal with this, but they do not initialize all of that. For Comedi instruction codes that write to the subdevice, the first `insn->n` data elements are copied from user-space, but the remaining elements are left uninitialized. That could be a problem if the subdevice instruction handler reads the uninitialized data. Ensure that the first `MIN_SAMPLES` elements are initialized before calling these instruction handlers, filling the uncopied elements with 0. For `do_insnlist_ioctl()`, the same data buffer elements are used for handling a list of instructions, so ensure the first `MIN_SAMPLES` elements are initialized for each instruction that writes to the subdevice.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 6f38c6380c3b38a05032b8881e41137385a6ce02; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 13e4d9038a1e869445a996a3f604a84ef52fe8f4; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 020eed5681d0f9bced73970368078a92d6cfaa9c; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before d3436638738ace8f101af7bdee2eae1bc38e9b29; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 673ee92bd2d31055bca98a1d96b653f5284289c4; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before c42116dc70af6664526f7aa82cf937824ab42649; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 46d8c744136ce2454aa4c35c138cc06817f92b8e |
| Linux / Linux | affected 2.6.29; unaffected 0 before 2.6.29; unaffected 5.4.297 through 5.4.*; unaffected 5.10.241 through 5.10.*; unaffected 5.15.190 through 5.15.*; unaffected 6.1.147 through 6.1.*; unaffected 6.6.100 through 6.6.*; unaffected 6.12.40 through 6.12.*; unaffected 6.15.8 through 6.15.*; unaffected 6.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6f38c6380c3b38a05032b8881e41137385a6ce02
- https://git.kernel.org/stable/c/13e4d9038a1e869445a996a3f604a84ef52fe8f4
- https://git.kernel.org/stable/c/020eed5681d0f9bced73970368078a92d6cfaa9c
- https://git.kernel.org/stable/c/d3436638738ace8f101af7bdee2eae1bc38e9b29
- https://git.kernel.org/stable/c/673ee92bd2d31055bca98a1d96b653f5284289c4
- https://git.kernel.org/stable/c/c42116dc70af6664526f7aa82cf937824ab42649
- https://git.kernel.org/stable/c/fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9
- https://git.kernel.org/stable/c/46d8c744136ce2454aa4c35c138cc06817f92b8e
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.