# CVE-2026-53162: linux: In the Linux kernel, the following vulnerability has been resolved: memcg: use round-robin victim selection in refil... CVE-2026-53162 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-53162, released June 28, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-53162 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0017 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 25, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: memcg: use round-robin victim selection in refill_stock Harry Yoo reported that get_random_u32_below() is not safe to call in the nmi context and memcg charge draining can happen in nmi context. More specifically get_random_u32_below() is neither reentrant- nor NMI-safe: it acquires a per-cpu local_lock via local_lock_irqsave() on the batched_entropy_u32 state. An NMI that lands on a CPU mid-update of the ChaCha batch state and recurses into the random subsystem would corrupt that state. The memcg_stock local_trylock prevents re-entry on the percpu stock itself, but cannot protect an unrelated subsystem's per-cpu lock. Replace the random pick with a per-cpu round-robin counter stored in memcg_stock_pcp and serialized by the same local_trylock that already guards cached[] and nr_pages[]. No atomics, no random calls, no extra locks needed. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel-livepatch-6.18.36-69.134 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53162](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53162.md) | Jun 28, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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