EUVD-2026-28617
GHSA-2cxw-35rj-wxq7
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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4DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
bpf: reject direct access to nullable PTR_TO_BUF pointers
check_mem_access() matches PTR_TO_BUF via base_type() which strips PTR_MAYBE_NULL, allowing direct dereference without a null check.
Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL. On stop callbacks these are NULL, causing a kernel NULL dereference.
Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the existing PTR_TO_BTF_ID pattern.
AnalysisAI
Kernel NULL pointer dereference in Linux kernel's BPF verifier allows local authenticated users to trigger a denial of service. The vulnerability stems from improper handling of nullable PTR_TO_BUF pointers in check_mem_access(), where map iterator callbacks can dereference NULL ctx->key or ctx->value pointers without validation, causing a kernel crash. …
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