CVE-2024-36886

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix UAF in error path

Sam Page (sam4k) working with Trend Micro Zero Day Initiative reported a UAF in the tipcbufappend() error path:

BUG: KASAN: slab-use-after-free in kfreeskblist_reason+0x47e/0x4c0 linux/net/core/skbuff.c:1183 Read of size 8 at addr ffff88804d2a7c80 by task poc/8034

CPU: 1 PID: 8034 Comm: poc Not tainted 6.8.2 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-5 04/01/2014 Call Trace: <IRQ> __dumpstack linux/lib/dumpstack.c:88 dumpstacklvl+0xd9/0x1b0 linux/lib/dumpstack.c:106 printaddressdescription linux/mm/kasan/report.c:377 printreport+0xc4/0x620 linux/mm/kasan/report.c:488 kasanreport+0xda/0x110 linux/mm/kasan/report.c:601 kfreeskblistreason+0x47e/0x4c0 linux/net/core/skbuff.c:1183 skbreleasedata+0x5af/0x880 linux/net/core/skbuff.c:1026 skbreleaseall linux/net/core/skbuff.c:1094 __kfreeskb linux/net/core/skbuff.c:1108 kfreeskbreason+0x12d/0x210 linux/net/core/skbuff.c:1144 kfreeskb linux/./include/linux/skbuff.h:1244 tipcbufappend+0x425/0xb50 linux/net/tipc/msg.c:186 tipclinkinput+0x224/0x7c0 linux/net/tipc/link.c:1324 tipclinkrcv+0x76e/0x2d70 linux/net/tipc/link.c:1824 tipcrcv+0x45f/0x10f0 linux/net/tipc/node.c:2159 tipcudprecv+0x73b/0x8f0 linux/net/tipc/udpmedia.c:390 udpqueuercvoneskb+0xad2/0x1850 linux/net/ipv4/udp.c:2108 udpqueuercvskb+0x131/0xb00 linux/net/ipv4/udp.c:2186 udpunicastrcvskb+0x165/0x3b0 linux/net/ipv4/udp.c:2346 __udp4librcv+0x2594/0x3400 linux/net/ipv4/udp.c:2422 ip_protocoldeliverrcu+0x30c/0x4e0 linux/net/ipv4/ipinput.c:205 iplocaldeliverfinish+0x2e4/0x520 linux/net/ipv4/ipinput.c:233 NFHOOK linux/./include/linux/netfilter.h:314 NFHOOK linux/./include/linux/netfilter.h:308 iplocaldeliver+0x18e/0x1f0 linux/net/ipv4/ipinput.c:254 dstinput linux/./include/net/dst.h:461 iprcvfinish linux/net/ipv4/ipinput.c:449 NFHOOK linux/./include/linux/netfilter.h:314 NFHOOK linux/./include/linux/netfilter.h:308 iprcv+0x2c5/0x5d0 linux/net/ipv4/ipinput.c:569 __netifreceiveskbonecore+0x199/0x1e0 linux/net/core/dev.c:5534 __netifreceiveskb+0x1f/0x1c0 linux/net/core/dev.c:5648 process_backlog+0x101/0x6b0 linux/net/core/dev.c:5976 __napipoll.constprop.0+0xba/0x550 linux/net/core/dev.c:6576 napipoll linux/net/core/dev.c:6645 netrxaction+0x95a/0xe90 linux/net/core/dev.c:6781 __dosoftirq+0x21f/0x8e7 linux/kernel/softirq.c:553 dosoftirq linux/kernel/softirq.c:454 do_softirq+0xb2/0xf0 linux/kernel/softirq.c:441 </IRQ> <TASK> __localbhenable_ip+0x100/0x120 linux/kernel/softirq.c:381 localbhenable linux/./include/linux/bottomhalf.h:33 rcureadunlockbh linux/./include/linux/rcupdate.h:851 __devqueuexmit+0x871/0x3ee0 linux/net/core/dev.c:4378 devqueuexmit linux/./include/linux/netdevice.h:3169 neighhhoutput linux/./include/net/neighbour.h:526 neighoutput linux/./include/net/neighbour.h:540 ipfinishoutput2+0x169f/0x2550 linux/net/ipv4/ipoutput.c:235 __ipfinishoutput linux/net/ipv4/ip_output.c:313 __ipfinishoutput+0x49e/0x950 linux/net/ipv4/ipoutput.c:295 ipfinishoutput+0x31/0x310 linux/net/ipv4/ipoutput.c:323 NFHOOKCOND linux/./include/linux/netfilter.h:303 ipoutput+0x13b/0x2a0 linux/net/ipv4/ipoutput.c:433 dstoutput linux/./include/net/dst.h:451 iplocalout linux/net/ipv4/ipoutput.c:129 ipsendskb+0x3e5/0x560 linux/net/ipv4/ipoutput.c:1492 udpsendskb+0x73f/0x1530 linux/net/ipv4/udp.c:963 udpsendmsg+0x1a36/0x2b40 linux/net/ipv4/udp.c:1250 inetsendmsg+0x105/0x140 linux/net/ipv4/afinet.c:850 socksendmsgnosec linux/net/socket.c:730 __sock_sendmsg linux/net/socket.c:745 __sys_sendto+0x42c/0x4e0 linux/net/socket.c:2191 __dosyssendto linux/net/socket.c:2203 __sesyssendto linux/net/socket.c:2199 __x64syssendto+0xe0/0x1c0 linux/net/socket.c:2199 dosyscallx64 linux/arch/x86/entry/common.c:52 dosyscall ---truncated---