CVE-2026-43333
bpf: reject direct access to nullable PTR_TO_BUF pointers
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 8, 2026 |
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Affected Versions
Linux / Linux
b453361384c2db1c703dacb806d5fd36aec4ceca < 10bc4a4dcded509c5d5c67d497900c3922c604cd 20b2aff4bc15bda809f994761d5719827d66c0b4 < 21a10c06ffae24cb01fd174a7ab7736001d2ea56 20b2aff4bc15bda809f994761d5719827d66c0b4 < 8755066f7bd0f4ac46a29d1708c7b20894539252 20b2aff4bc15bda809f994761d5719827d66c0b4 < 70abd9d118da2f56beb4ec22e3a29becae373535 20b2aff4bc15bda809f994761d5719827d66c0b4 < 63276547debc4d8a73eefb2c5273b2a905c961b0 20b2aff4bc15bda809f994761d5719827d66c0b4 < 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 20b2aff4bc15bda809f994761d5719827d66c0b4 < b0db1accbc7395657c2b79db59fa9fae0d6656f3 e982070f8970bb62e69ed7c9cafff886ed200349
Linux / Linux
5.17
References
git.kernel.org: https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd git.kernel.org: https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56 git.kernel.org: https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252 git.kernel.org: https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535 git.kernel.org: https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0 git.kernel.org: https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 git.kernel.org: https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3