# CVE-2026-31734: linux: In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix is_bpf_migration_disabled() false... CVE-2026-31734 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2026-31734, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-31734 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0012 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 1, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix is_bpf_migration_disabled() false negative on non-PREEMPT_RCU Since commit 8e4f0b1ebcf2 ("bpf: use rcu_read_lock_dont_migrate() for trampoline.c"), the BPF prolog (__bpf_prog_enter) calls migrate_disable() only when CONFIG_PREEMPT_RCU is enabled, via rcu_read_lock_dont_migrate(). Without CONFIG_PREEMPT_RCU, the prolog never touches migration_disabled, so migration_disabled == 1 always means the task is truly migration-disabled regardless of whether it is the current task. The old unconditional p == current check was a false negative in this case, potentially allowing a migration-disabled task to be dispatched to a remote CPU and triggering scx_error in task_can_run_on_remote_rq(). Only apply the p == current disambiguation when CONFIG_PREEMPT_RCU is enabled, where the ambiguity with the BPF prolog still exists. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool6.18 amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel-livepatch-6.18.25-52.107 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | linux Debian 14 | 6.19.12-1 | [DEBIAN-CVE-2026-31734](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31734.md) | May 15, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.25-52.107.amzn2023 | [ALAS2023-2026-1746](https://patchblox.com/security/data/fix/linux/alas2023-2026-1746.md) | May 25, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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