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In the Linux kernel, the following vulnerability has been resolved:
perf/core: Handle buffer mapping fail correctly in perf_mmap()
After successful allocation of a buffer or a successful attachment to an existing buffer perf_mmap() tries to map the buffer read only into the page table. If that fails, the already set up page table entries are zapped, but the other perf specific side effects of that failure are not handled. The calling code just cleans up the VMA and does not invoke perf_mmap_close().
This leaks reference counts, corrupts user->vm accounting and also results in an unbalanced invocation of event::event_mapped().
Cure this by moving the event::event_mapped() invocation before the map_range() call so that on map_range() failure perf_mmap_close() can be invoked without causing an unbalanced event::event_unmapped() call.
perf_mmap_close() undoes the reference counts and eventually frees buffers.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Suse | — | Upgrade dtb-amlogicUpgrade dtb-rockchipUpgrade kernel-rtUpgrade kselftests-kmp-64kbUpgrade dtb-exynosUpgrade dtb-caviumUpgrade kernel-default-optionalUpgrade kernel-rt-livepatchUpgrade kernel-zfcpdumpUpgrade kernel-rt-vdsoUpgrade dtb-lgUpgrade kernel-kvmsmall-develUpgrade cluster-md-kmp-rtUpgrade ocfs2-kmp-rtUpgrade dtb-alteraUpgrade dtb-xilinxUpgrade kernel-kvmsmallUpgrade dtb-apmUpgrade dtb-mediatekUpgrade dlm-kmp-64kbUpgrade dtb-nvidiaUpgrade kernel-default-vdsoUpgrade kernel-rt-extraUpgrade kernel-sourceUpgrade kernel-develUpgrade kernel-macrosUpgrade kernel-obs-buildUpgrade dtb-qcomUpgrade kernel-obs-qaUpgrade kernel-rt-develUpgrade dtb-armUpgrade kernel-default-extraUpgrade gfs2-kmp-rtUpgrade dtb-allwinnerUpgrade cluster-md-kmp-64kbUpgrade kselftests-kmp-rtUpgrade dtb-amdUpgrade gfs2-kmp-64kbUpgrade dtb-sprdUpgrade dtb-hisiliconUpgrade cluster-md-kmp-defaultUpgrade kernel-symsUpgrade kernel-default-livepatchUpgrade dlm-kmp-defaultUpgrade kernel-docs-htmlUpgrade dtb-broadcomUpgrade kernel-64kb-develUpgrade kernel-rt-optionalUpgrade dtb-renesasUpgrade dlm-kmp-rtUpgrade kernel-default-livepatch-develUpgrade kernel-64kbUpgrade kselftests-kmp-defaultUpgrade ocfs2-kmp-64kbUpgrade kernel-source-vanillaUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-develUpgrade dtb-marvellUpgrade dtb-freescaleUpgrade dtb-appleUpgrade kernel-docsUpgrade kernel-64kb-extraUpgrade dtb-amazonUpgrade dtb-socionextUpgrade kernel-defaultUpgrade kernel-rt-livepatch-develUpgrade gfs2-kmp-defaultUpgrade ocfs2-kmp-defaultUpgrade kernel-64kb-optional | Dec 5, 2025 | Nov 6, 2025 |
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