In the Linux kernel, the following vulnerability has been resolved:
net/ipv6: avoid possible UAF in ip6_route_mpath_notify() syzbot found
another use-after-free in ip6_route_mpath_notify() [1] Commit f7225172f25a
(“net/ipv6: prevent use after free in ip6_route_mpath_notify”) was not able
to fix the root cause. We need to defer the fib6_info_release() calls after
ip6_route_mpath_notify(), in the cleanup phase. [1] BUG: KASAN:
slab-use-after-free in rt6_fill_node+0x1460/0x1ac0 Read of size 4 at addr
ffff88809a07fc64 by task syz-executor.2/23037 CPU: 0 PID: 23037 Comm:
syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/25/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88
[inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180
mm/kasan/report.c:601 rt6_fill_node+0x1460/0x1ac0
inet6_rt_notify+0x13b/0x290 net/ipv6/route.c:6184 ip6_route_mpath_notify
net/ipv6/route.c:5198 [inline] ip6_route_multipath_add
net/ipv6/route.c:5404 [inline] inet6_rtm_newroute+0x1d0f/0x2300
net/ipv6/route.c:5517 rtnetlink_rcv_msg+0x885/0x1040
net/core/rtnetlink.c:6597 netlink_rcv_skb+0x1e3/0x430
net/netlink/af_netlink.c:2543 netlink_unicast_kernel
net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ea/0x980
net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70
net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0
net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline]
__sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f73dd87dda9 Code: 28
00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6
48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01
c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f73de6550c8
EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX:
00007f73dd9ac050 RCX: 00007f73dd87dda9 RDX: 0000000000000000 RSI:
0000000020000140 RDI: 0000000000000005 RBP: 00007f73dd8ca47a R08:
0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11:
0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14:
00007f73dd9ac050 R15: 00007ffdbdeb7858 </TASK> Allocated by task 23037:
kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80
mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc
include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981
[inline] __kmalloc+0x22e/0x490 mm/slub.c:3994 kmalloc
include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline]
fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3758
ip6_route_multipath_add net/ipv6/route.c:5298 [inline]
inet6_rtm_newroute+0x744/0x2300 net/ipv6/route.c:5517
rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367
netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270
net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0
net/socket.c:2667 do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 16: kasan_save_stack
mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80
mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640
poison_slab_object+0xa6/0xe0 m —truncated—
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 20.04 | noarch | linux | < 5.4.0-189.209 | UNKNOWN |
ubuntu | 22.04 | noarch | linux | < 5.15.0-112.122 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < 5.4.0-1128.138 | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws | < 5.15.0-1063.69 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws-5.15 | < 5.15.0-1063.69~20.04.1 | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws-6.5 | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < 5.4.0-1133.140 | UNKNOWN |
ubuntu | 22.04 | noarch | linux-azure | < 5.15.0-1066.75 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure-5.15 | < any | UNKNOWN |
git.kernel.org/linus/685f7d531264599b3f167f1e94bbd22f120e5fab (6.8)
git.kernel.org/stable/c/31ea5bcc7d4cd1423de6be327a2c034725704136
git.kernel.org/stable/c/394334fe2ae3b9f1e2332b873857e84cb28aac18
git.kernel.org/stable/c/61b34f73cdbdb8eaf9ea12e9e2eb3b29716c4dda
git.kernel.org/stable/c/664f9c647260cc9d68b4e31d9899530d89dd045e
git.kernel.org/stable/c/685f7d531264599b3f167f1e94bbd22f120e5fab
git.kernel.org/stable/c/79ce2e54cc0ae366f45516c00bf1b19aa43e9abe
git.kernel.org/stable/c/cae3303257950d03ffec2df4a45e836f10d26c24
git.kernel.org/stable/c/ed883060c38721ed828061f6c0c30e5147326c9a
launchpad.net/bugs/cve/CVE-2024-26852
nvd.nist.gov/vuln/detail/CVE-2024-26852
security-tracker.debian.org/tracker/CVE-2024-26852
ubuntu.com/security/notices/USN-6820-1
ubuntu.com/security/notices/USN-6820-2
ubuntu.com/security/notices/USN-6821-1
ubuntu.com/security/notices/USN-6821-2
ubuntu.com/security/notices/USN-6821-3
ubuntu.com/security/notices/USN-6821-4
ubuntu.com/security/notices/USN-6828-1
ubuntu.com/security/notices/USN-6871-1
ubuntu.com/security/notices/USN-6892-1
ubuntu.com/security/notices/USN-6896-1
ubuntu.com/security/notices/USN-6896-2
ubuntu.com/security/notices/USN-6896-3
ubuntu.com/security/notices/USN-6896-4
ubuntu.com/security/notices/USN-6896-5
ubuntu.com/security/notices/USN-6919-1
www.cve.org/CVERecord?id=CVE-2024-26852