# CVE-2026-98034: bpf: Mark NULL kptr stores precise CVE-2026-98034 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-98034, released October 2, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-98034 - Priority: High - CVSS: 7.1 (Moderate) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 25, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98034 ## Description In the Linux kernel, the following vulnerability has been resolved: bpf: Mark NULL kptr stores precise check_map_kptr_access() permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it does not mark that register precise. A state checkpoint reached with an imprecise zero can therefore prune a second path that reaches the store with an arbitrary nonzero scalar. The program can write attacker-controlled bits into the kptr field and load them back as a PTR_TO_BTF_ID. Call mark_chain_precision() before accepting a known-zero register. This forces state equivalence to compare its scalar range and makes the verifier visit and reject a path carrying a nonzero value. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | bpftool-debuginfo amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | bpftool6.12 amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | bpftool6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-debuginfo amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-devel amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-headers amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.1.189-236.399 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.12.113-138.209 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.18.56-125.164 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel-modules-extra amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-tools amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel-tools-devel amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | kernel6.12 amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-98034](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98034.md) | Oct 2, 2026 | | Linux | linux Debian 14 | 7.2.7-1 | [DEBIAN-CVE-2026-98034](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98034.md) | Oct 2, 2026 | | Linux | microvm-kernel amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | perf amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | perf-debuginfo amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | perf6.12 amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | python3-perf amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.189-236.399.amzn2023 | [ALAS2023-2026-3336](https://patchblox.com/security/data/fix/linux/alas2023-2026-3336.md) | Nov 7, 2026 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.113-138.209.amzn2023 | [ALAS2023-2026-3335](https://patchblox.com/security/data/fix/linux/alas2023-2026-3335.md) | Nov 7, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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