CVE-2026-43333bpf: reject direct access to nullable PTR_TO_BUF pointers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- May 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b453361384c2db1c703dacb806d5fd36aec4ceca before 10bc4a4dcded509c5d5c67d497900c3922c604cd; from 20b2aff4bc15bda809f994761d5719827d66c0b4 before 21a10c06ffae24cb01fd174a7ab7736001d2ea56; from 20b2aff4bc15bda809f994761d5719827d66c0b4 before 8755066f7bd0f4ac46a29d1708c7b20894539252; from 20b2aff4bc15bda809f994761d5719827d66c0b4 before 70abd9d118da2f56beb4ec22e3a29becae373535; from 20b2aff4bc15bda809f994761d5719827d66c0b4 before 63276547debc4d8a73eefb2c5273b2a905c961b0; 20b2aff4bc15bda809f994761d5719827d66c0b4 builds before 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09; from 20b2aff4bc15bda809f994761d5719827d66c0b4 before b0db1accbc7395657c2b79db59fa9fae0d6656f3; e982070f8970bb62e69ed7c9cafff886ed200349; and 2 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15.37 before 5.15.203; from 5.16.11 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cdpatch
- https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56patch
- https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252patch
- https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535patch
- https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0patch
- https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09patch
- https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.