CVE-2021-47250 in Linux
الملخص
بحسب VulDB • 17/06/2026
في نواة لينكس، تم حل الثغرة التالية:
net: ipv4: إصلاح تسرب الذاكرة في netlbl_cipsov4_add_std
أبلغ عنها syzkaller: BUG: memory leak unreferenced object 0xffff888105df7000 (size 64): comm "syz-executor842", pid 360, jiffies 4294824824 (age 22.546s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] kmalloc include/linux/slab.h:590 [inline]
[] kzalloc include/linux/slab.h:720 [inline]
[] netlbl_cipsov4_add_std net/netlabel/netlabel_cipso_v4.c:145 [inline]
[] netlbl_cipsov4_add+0x390/0x2340 net/netlabel/netlabel_cipso_v4.c:416
[] genl_family_rcv_msg_doit.isra.0+0x20e/0x320 net/netlink/genetlink.c:739
[] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
[] genl_rcv_msg+0x2bf/0x4f0 net/netlink/genetlink.c:800
[] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504
[] genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
[] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
[] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340
[] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929
[] sock_sendmsg_nosec net/socket.c:654 [inline]
[] sock_sendmsg+0x139/0x170 net/socket.c:674
[] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350
[] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404
[] __sys_sendmsg+0xd3/0x190 net/socket.c:2433
[] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47
[] entry_SYSCALL_64_after_hwframe+0x44/0xae
يتم تخصيص ذاكرة doi_def->map.std في netlbl_cipsov4_add_std، ولكن لا يوجد مكان يقوم بإفراغها. يجب إفراغها في cipso_v4_doi_free الذي يقوم بإفراغ مورد cipso DOI.
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