{"id":"CVE-2022-50546","summary":"ext4: fix uninititialized value in 'ext4_evict_inode'","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix uninititialized value in 'ext4_evict_inode'\n\nSyzbot found the following issue:\n=====================================================\nBUG: KMSAN: uninit-value in ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180\n ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180\n evict+0x365/0x9a0 fs/inode.c:664\n iput_final fs/inode.c:1747 [inline]\n iput+0x985/0xdd0 fs/inode.c:1773\n __ext4_new_inode+0xe54/0x7ec0 fs/ext4/ialloc.c:1361\n ext4_mknod+0x376/0x840 fs/ext4/namei.c:2844\n vfs_mknod+0x79d/0x830 fs/namei.c:3914\n do_mknodat+0x47d/0xaa0\n __do_sys_mknodat fs/namei.c:3992 [inline]\n __se_sys_mknodat fs/namei.c:3989 [inline]\n __ia32_sys_mknodat+0xeb/0x150 fs/namei.c:3989\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\n __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\n do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\n\nUninit was created at:\n __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578\n alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285\n alloc_slab_page mm/slub.c:1794 [inline]\n allocate_slab+0x1b5/0x1010 mm/slub.c:1939\n new_slab mm/slub.c:1992 [inline]\n ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180\n __slab_alloc mm/slub.c:3279 [inline]\n slab_alloc_node mm/slub.c:3364 [inline]\n slab_alloc mm/slub.c:3406 [inline]\n __kmem_cache_alloc_lru mm/slub.c:3413 [inline]\n kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429\n alloc_inode_sb include/linux/fs.h:3117 [inline]\n ext4_alloc_inode+0x5f/0x860 fs/ext4/super.c:1321\n alloc_inode+0x83/0x440 fs/inode.c:259\n new_inode_pseudo fs/inode.c:1018 [inline]\n new_inode+0x3b/0x430 fs/inode.c:1046\n __ext4_new_inode+0x2a7/0x7ec0 fs/ext4/ialloc.c:959\n ext4_mkdir+0x4d5/0x1560 fs/ext4/namei.c:2992\n vfs_mkdir+0x62a/0x870 fs/namei.c:4035\n do_mkdirat+0x466/0x7b0 fs/namei.c:4060\n __do_sys_mkdirat fs/namei.c:4075 [inline]\n __se_sys_mkdirat fs/namei.c:4073 [inline]\n __ia32_sys_mkdirat+0xc4/0x120 fs/namei.c:4073\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\n __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\n do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\n\nCPU: 1 PID: 4625 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-62821-gcb231e2f67ec #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\n=====================================================\n\nNow, 'ext4_alloc_inode()' didn't init 'ei-\u003ei_flags'. If new inode failed\nbefore set 'ei-\u003ei_flags' in '__ext4_new_inode()', then do 'iput()'. As after\n6bc0d63dad7f commit will access 'ei-\u003ei_flags' in 'ext4_evict_inode()' which\nwill lead to access uninit-value.\nTo solve above issue just init 'ei-\u003ei_flags' in 'ext4_alloc_inode()'.","modified":"2026-03-20T12:22:36.052632Z","published":"2025-10-07T15:21:09.963Z","related":["SUSE-SU-2025:4111-1","SUSE-SU-2025:4135-1","SUSE-SU-2025:4139-1","SUSE-SU-2025:4149-1","SUSE-SU-2025:4188-1","SUSE-SU-2025:4320-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50546.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/091f85db4c3fb1734a6d7fb4777a2b2831da6631"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c31d8d3ad95aef8cc17a4fcf317e46217148439"},{"type":"WEB","url":"https://git.kernel.org/stable/c/56491d60ddca9c697d885394cb0173675b9ab81f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ea71af94eaaaf6d9aed24bc94a05b977a741cb9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9f966e021c20caae639dd0e404c8761e8281a2c4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e431b4fb1fb8c2654b808086e9747a000adb9655"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0bffdcc7cb14598af2aa706f1e0f2a9054154ba"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50546.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50546"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bb337d8dd1e1d6b7719872e45e36392f3ab14b4f"},{"fixed":"f0bffdcc7cb14598af2aa706f1e0f2a9054154ba"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a5f9bd4beae8553480d02b569d4aabee1b49345d"},{"fixed":"e431b4fb1fb8c2654b808086e9747a000adb9655"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0e6fbc566fcc4c230bf80f76cf5df26b42142d8a"},{"fixed":"091f85db4c3fb1734a6d7fb4777a2b2831da6631"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0b885394fd009aa0b46d81b496a816ab11309f8a"},{"fixed":"3c31d8d3ad95aef8cc17a4fcf317e46217148439"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6bc0d63dad7f9f54d381925ee855b402f652fa39"},{"fixed":"56491d60ddca9c697d885394cb0173675b9ab81f"},{"fixed":"9f966e021c20caae639dd0e404c8761e8281a2c4"},{"fixed":"7ea71af94eaaaf6d9aed24bc94a05b977a741cb9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"819d16f7feaca0f2ed3409be14fe953127fc51b6"},{"last_affected":"458aee4a6e5be7ad862ee27dfaf07ce552d84f32"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50546.json"}}],"schema_version":"1.7.5"}