Unrated severityNVD Advisory· Published Oct 21, 2024· Updated Nov 3, 2025
block, bfq: fix uaf for accessing waker_bfqq after splitting
CVE-2024-49854
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.
Affected products
64- osv-coords63 versionspkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-rt_debug&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/kernel-source-longterm&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/kernel-source-rt&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-syms-rt&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.6pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6pkg:rpm/suse/kernel-coco_debug&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6pkg:rpm/suse/kernel-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP6pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP6pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-livepatch-MICRO-6-0-RT_Update_5&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-livepatch-MICRO-6-0-RT_Update_5&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-livepatch-MICRO-6-0_Update_5&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-livepatch-MICRO-6-0_Update_5&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-livepatch-SLE15-SP6-RT_Update_7&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6pkg:rpm/suse/kernel-livepatch-SLE15-SP6_Update_7&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP6pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6pkg:rpm/suse/kernel-source-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6pkg:rpm/suse/kernel-syms-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6
< 6.4.0-150600.23.33.1+ 62 more
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.8.23.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1.150600.12.14.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.8.23.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.11.8-1.1
- (no CPE)range: < 6.12.11-1.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.8.23.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.8.23.1
- (no CPE)range: < 6.4.0-15061.12.coco15sp6.1
- (no CPE)range: < 6.4.0-15061.12.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.33.1.150600.12.14.1
- (no CPE)range: < 6.4.0-24.1.21.4
- (no CPE)range: < 6.4.0-24.1.21.4
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 1-1.1
- (no CPE)range: < 1-1.1
- (no CPE)range: < 1-1.2
- (no CPE)range: < 1-1.2
- (no CPE)range: < 1-150600.1.3.1
- (no CPE)range: < 1-150600.13.3.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.8.23.1
- (no CPE)range: < 6.4.0-15061.12.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-25.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.8.23.1
- (no CPE)range: < 6.4.0-15061.12.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.33.1
- (no CPE)range: < 6.4.0-150600.10.23.1
- (no CPE)range: < 6.4.0-150600.23.33.1
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7fmitre
- git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583mitre
- git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eafmitre
- git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726mitre
- git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04femitre
- git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bdmitre
News mentions
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