ALSA: control: Validate buf_len before strnlen() in snd_ctl_elem_init_enum_names()

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Summary

CVECVE-2026-46088
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:30 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.051520000 (date 2026-05-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 1fbe46d2b72754d8bd580e13e59ccb5d3d0e8cb0 git Not specified
CNA Linux Linux affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 8ba0214c3dd32b8ec652947e3f2bc5b8f6e6be9e git Not specified
CNA Linux Linux affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 654c818a69c21d2bea4e8fd9eae7da865df9a5c8 git Not specified
CNA Linux Linux affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 82012fd3e78a14360fbc2f1a7491589896704f97 git Not specified
CNA Linux Linux affected 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4 e0da8a8cac74f4b9f577979d131f0d2b88a84487 git Not specified
CNA Linux Linux affected 3.2 Not specified
CNA Linux Linux unaffected 3.2 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/654c818a69c21d2bea4e8fd9eae7da865df9a5c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82012fd3e78a14360fbc2f1a7491589896704f97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1fbe46d2b72754d8bd580e13e59ccb5d3d0e8cb0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ba0214c3dd32b8ec652947e3f2bc5b8f6e6be9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0da8a8cac74f4b9f577979d131f0d2b88a84487 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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