CVE-2026-23205 in Linux
요약
\~에 의해 VulDB • 2026. 06. 25.
리눅스 커널에서 다음 취약점이 해결되었습니다.
smb/client: smb2_open_file()의 메모리 누수 수정
재현 절차:
1. 서버: 디렉토리가 읽기 전용으로 내보내짐 2. 클라이언트: mount -t cifs //${server_ip}/export /mnt
3. 클라이언트: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct 4. 클라이언트: umount /mnt 5. 클라이언트: sleep 1 6. 클라이언트: modprobe -r cifs
오류 메시지는 다음과 같습니다.
============================================================================= BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown() -----------------------------------------------------------------------------
Object 0x00000000d47521be @offset=14336 ... WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577 ... Call Trace: <TASK> kmem_cache_destroy+0x94/0x190 cifs_destroy_request_bufs+0x3e/0x50 [cifs]
cleanup_module+0x4e/0x540 [cifs]
__se_sys_delete_module+0x278/0x400 __x64_sys_delete_module+0x5f/0x70 x64_sys_call+0x2299/0x2ff0 do_syscall_64+0x89/0x350 entry_SYSCALL_64_after_hwframe+0x76/0x7e ... kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs]
WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577
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