CVE-2023-52698 Information

May 18, 2024 cve

Description

In the Linux kernel the following vulnerability has been resolved:

calipso: fix memory leak in netlbl_calipso_add_pass()

If IPv6 support is disabled at boot (ipv6.disable=1) the calipso_init() -> netlbl_calipso_ops_register() function isn’t called and the netlbl_calipso_ops_get() function always returns NULL. In this case the netlbl_calipso_add_pass() function allocates memory for the doi_def variable but doesn’t free it with the calipso_doi_free().

BUG: memory leak unreferenced object 0xffff888011d68180 (size 64): comm \syz-executor.1\ pid 10746 jiffies 4295410986 (age 17.928s) hex dump (first 32 bytes): 00 00 00 00 02 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:552 [inline] [<…>] netlbl_calipso_add_pass net/netlabel/netlabel_calipso.c:76 [inline] [<…>] netlbl_calipso_add+0x22e/0x4f0 net/netlabel/netlabel_calipso.c:111 [<…>] genl_family_rcv_msg_doit+0x22f/0x330 net/netlink/genetlink.c:739 [<…>] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] [<…>] genl_rcv_msg+0x341/0x5a0 net/netlink/genetlink.c:800 [<…>] netlink_rcv_skb+0x14d/0x440 net/netlink/af_netlink.c:2515 [<…>] genl_rcv+0x29/0x40 net/netlink/genetlink.c:811 [<…>] netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] [<…>] netlink_unicast+0x54b/0x800 net/netlink/af_netlink.c:1339 [<…>] netlink_sendmsg+0x90a/0xdf0 net/netlink/af_netlink.c:1934 [<…>] sock_sendmsg_nosec net/socket.c:651 [inline] [<…>] sock_sendmsg+0x157/0x190 net/socket.c:671 [<…>] ____sys_sendmsg+0x712/0x870 net/socket.c:2342 [<…>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2396 [<…>] __sys_sendmsg+0xea/0x1b0 net/socket.c:2429 [<…>] do_syscall_64+0x30/0x40 arch/x86/entry/common.c:46 [<…>] entry_SYSCALL_64_after_hwframe+0x61/0xc6

Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller

[PM: merged via the LSM tree at Jakub Kicinski request]

Reference

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