# CVE-2026-93125: bpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max CVE-2026-93125 is fixed in 56 products on 1 platform, first by DEBIAN-CVE-2026-93125, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-93125 - Priority: High - CVSS: 7.8 (Moderate) - EPSS: 0.0013 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 17, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93125 ## Description In the Linux kernel, the following vulnerability has been resolved: bpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max check_kfunc_args() detects a kfunc argument named rdonly_buf_size or rdwr_buf_size and stores reg->var_off.value into meta->r0_size, a u64, and does not bound it. check_kfunc_call() later copies that value into the returned register's mem_size field: meta->r0_size = reg->var_off.value; ... regs[BPF_REG_0].mem_size = meta.r0_size; regs[BPF_REG_0].mem_size is u32. A constant whose upper 32 bits are set gets truncated instead of causing a load-time rejection, so the verifier records a PTR_TO_MEM register with an approximately 4 GiB mem_size for whatever allocation the kfunc returned. A later access check against that register uses the truncated, wrong bound. Reject rdonly_buf_size/rdwr_buf_size values that exceed U32_MAX at the point meta->r0_size is set. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | bpftool-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | bpftool6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | bpftool6.18 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-devel amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-headers amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.1.188-233.393 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.12.111-136.204 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.18.54-121.166 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel-modules-extra amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-tools amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-tools-devel amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-93125](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93125.md) | Sep 23, 2026 | | Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-93125](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93125.md) | Sep 23, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | perf amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | perf-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | perf6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | python3-perf amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.54-121.166.amzn2023 | [ALAS2023-2026-3192](https://patchblox.com/security/data/fix/linux/alas2023-2026-3192.md) | Nov 7, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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