Vulnerability-Lookup

FKIE_CVE-2026-43333

Vulnerability from fkie_nvd - Published: 2026-05-08 14:16 - Updated: 2026-05-15 20:07

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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}

CVE-2026-43333 (GCVE-0-2026-43333)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-05-23 16:06

Title

bpf: reject direct access to nullable PTR_TO_BUF pointers

Summary

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/10bc4a4dcded509c5…
https://git.kernel.org/stable/c/21a10c06ffae24cb0…
https://git.kernel.org/stable/c/8755066f7bd0f4ac4…
https://git.kernel.org/stable/c/70abd9d118da2f56b…
https://git.kernel.org/stable/c/63276547debc4d8a7…
https://git.kernel.org/stable/c/4f6c99dc0420f1a3d…
https://git.kernel.org/stable/c/b0db1accbc7395657…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b453361384c2db1c703dacb806d5fd36aec4ceca , < 10bc4a4dcded509c5d5c67d497900c3922c604cd (git) Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 21a10c06ffae24cb01fd174a7ab7736001d2ea56 (git) Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 8755066f7bd0f4ac46a29d1708c7b20894539252 (git) Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 70abd9d118da2f56beb4ec22e3a29becae373535 (git) Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 63276547debc4d8a73eefb2c5273b2a905c961b0 (git) Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 (git) Affected: 20b2aff4bc15bda809f994761d5719827d66c0b4 , < b0db1accbc7395657c2b79db59fa9fae0d6656f3 (git) Affected: e982070f8970bb62e69ed7c9cafff886ed200349 (git) Affected: 5.15.37 , < 5.15.203 (semver) Affected: 5.16.11 , < 5.17 (semver)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-43333

CVE-2026-43333 (GCVE-0-2026-43333)

Tags

Sightings

Nomenclature