{"api_version":"1","generated_at":"2026-08-22T17:47:31+00:00","cve":"CVE-2022-48674","urls":{"html":"https://cve.report/CVE-2022-48674","api":"https://cve.report/api/cve/CVE-2022-48674.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-48674","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-48674"},"summary":{"title":"erofs: fix pcluster use-after-free on UP platforms","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n <TASK>\n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n erofs_shrink_workstation+0x11f/0x210\n erofs_shrink_scan+0xdc/0x170\n shrink_slab.constprop.0+0x296/0x530\n drop_slab+0x1c/0x70\n drop_caches_sysctl_handler+0x70/0x80\n proc_sys_call_handler+0x20a/0x2f0\n vfs_write+0x555/0x6c0\n ksys_write+0xbe/0x160\n do_syscall_64+0x3b/0x90\n\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\n\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly 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the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n <TASK>\n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n 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fix pcluster use-after-free on UP platforms","CVE":"CVE-2022-48674","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"48674","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n <TASK>\n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n erofs_shrink_workstation+0x11f/0x210\n erofs_shrink_scan+0xdc/0x170\n shrink_slab.constprop.0+0x296/0x530\n drop_slab+0x1c/0x70\n drop_caches_sysctl_handler+0x70/0x80\n proc_sys_call_handler+0x20a/0x2f0\n vfs_write+0x555/0x6c0\n ksys_write+0xbe/0x160\n do_syscall_64+0x3b/0x90\n\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\n\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly instead.","Type":"Description","Title":"erofs: fix pcluster use-after-free on UP platforms"}]}}}