Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ALSA: control: Validate buf_len before strnlen() in snd_ctl_elem_init_enum_names() snd_ctl_elem_init_enum_names() advances pointer p through the names buffer while decrementing buf_len. If buf_len reaches zero but items remain, the next iteration calls strnlen(p, 0). While strnlen(p, 0) returns 0 and would hit the existing name_len == 0 error path, CONFIG_FORTIFY_SOURCE's fortified strnlen() first checks maxlen against __builtin_dynamic_object_size(). When Clang loses track of p's object size inside the loop, this triggers a BRK exception panic before the return value is examined. Add a buf_len == 0 guard at the loop entry to prevent calling fortified strnlen() on an exhausted buffer. Found by kernel fuzz testing through Xiaomi Smartphone.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before 708f6ec9bcdf58bfd561409110baaf4fd3be4ea3; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before bfcbb4994da9e979c4bcfcf24aaaac69e457e48e; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before a470f7cabc4df72d9bd132f5719a8717292bb440; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before 1fbe46d2b72754d8bd580e13e59ccb5d3d0e8cb0; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before 8ba0214c3dd32b8ec652947e3f2bc5b8f6e6be9e; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before 654c818a69c21d2bea4e8fd9eae7da865df9a5c8; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before 82012fd3e78a14360fbc2f1a7491589896704f97; affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 before e0da8a8cac74f4b9f577979d131f0d2b88a84487 |
| Linux / Linux | affected 3.2; unaffected 0 before 3.2; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/708f6ec9bcdf58bfd561409110baaf4fd3be4ea3
- https://git.kernel.org/stable/c/bfcbb4994da9e979c4bcfcf24aaaac69e457e48e
- https://git.kernel.org/stable/c/a470f7cabc4df72d9bd132f5719a8717292bb440
- https://git.kernel.org/stable/c/1fbe46d2b72754d8bd580e13e59ccb5d3d0e8cb0
- https://git.kernel.org/stable/c/8ba0214c3dd32b8ec652947e3f2bc5b8f6e6be9e
- https://git.kernel.org/stable/c/654c818a69c21d2bea4e8fd9eae7da865df9a5c8
- https://git.kernel.org/stable/c/82012fd3e78a14360fbc2f1a7491589896704f97
- https://git.kernel.org/stable/c/e0da8a8cac74f4b9f577979d131f0d2b88a84487
ADP enrichment
No English description supplied.