# CVE-2024-49854: linux: In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq aft... CVE-2024-49854 is fixed in 27 products on 1 platform, first by DEBIAN-CVE-2024-49854, released October 21, 2024. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2024-49854 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0022 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 21, 2024 ## Description In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe. Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.23.1 | [SUSE-SU-2025:0117-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0117-1.md) | Jan 15, 2025 | | Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.23.1 | [SUSE-SU-2025:0117-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0117-1.md) | Jan 15, 2025 | | Linux | kernel-coco sles 15.6 | 6.4.0-15061.12.coco15sp6.1 | [SUSE-SU-2025:0289-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0289-1.md) | Jan 29, 2025 | | Linux | kernel-coco_debug sles 15.6 | 6.4.0-15061.12.coco15sp6.1 | [SUSE-SU-2025:0289-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0289-1.md) | Jan 29, 2025 | | Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-default sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.33.1.150600.12.14.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.33.1.150600.12.14.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-livepatch-SLE15-SP6-RT_Update_7 sles 15.6 | 1-150600.1.3.1 | [SUSE-SU-2025:0153-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0153-1.md) | Jan 17, 2025 | | Linux | kernel-livepatch-SLE15-SP6_Update_7 sles 15.6 | 1-150600.13.3.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.23.1 | [SUSE-SU-2025:0153-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0153-1.md) | Jan 17, 2025 | | Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.23.1 | [SUSE-SU-2025:0153-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0153-1.md) | Jan 17, 2025 | | Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-source sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.23.1 | [SUSE-SU-2025:0117-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0117-1.md) | Jan 15, 2025 | | Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.23.1 | [SUSE-SU-2025:0117-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0117-1.md) | Jan 15, 2025 | | Linux | kernel-source-coco sles 15.6 | 6.4.0-15061.12.coco15sp6.1 | [SUSE-SU-2025:0289-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0289-1.md) | Jan 29, 2025 | | Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.23.1 | [SUSE-SU-2025:0153-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0153-1.md) | Jan 17, 2025 | | Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.23.1 | [SUSE-SU-2025:0117-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0117-1.md) | Jan 15, 2025 | | Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.23.1 | [SUSE-SU-2025:0117-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0117-1.md) | Jan 15, 2025 | | Linux | kernel-syms-coco sles 15.6 | 6.4.0-15061.12.coco15sp6.1 | [SUSE-SU-2025:0289-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0289-1.md) | Jan 29, 2025 | | Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.23.1 | [SUSE-SU-2025:0153-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0153-1.md) | Jan 17, 2025 | | Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.33.1 | [SUSE-SU-2025:0154-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0154-1.md) | Jan 17, 2025 | | Linux | linux Debian 12.15 (bookworm) | 6.1.115-1 | [DEBIAN-CVE-2024-49854](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49854.md) | Oct 21, 2024 | | Linux | linux Debian 13.5 (trixie) | 6.11.2-1 | [DEBIAN-CVE-2024-49854](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49854.md) | Oct 21, 2024 | | Linux | linux Debian 14 | 6.11.2-1 | [DEBIAN-CVE-2024-49854](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49854.md) | Oct 21, 2024 | | Linux | linux-6.1 Debian 11.6 (bullseye) | 6.1.119-1~deb11u1 | [DEBIAN-CVE-2024-49854](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49854.md) | Oct 21, 2024 | --- Data as of 2026-11-09T01:18:40Z UTC. 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