CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
Low
EPSS
Percentile
5.1%
In the Linux kernel, the following vulnerability has been resolved:
net/packet: fix slab-out-of-bounds access in packet_recvmsg()
syzbot found that when an AF_PACKET socket is using PACKET_COPY_THRESH
and mmap operations, tpacket_rcv() is queueing skbs with
garbage in skb->cb[], triggering a too big copy [1]
Presumably, users of af_packet using mmap() already gets correct
metadata from the mapped buffer, we can simply make sure
to clear 12 bytes that might be copied to user space later.
BUG: KASAN: stack-out-of-bounds in memcpy include/linux/fortify-string.h:225 [inline]
BUG: KASAN: stack-out-of-bounds in packet_recvmsg+0x56c/0x1150 net/packet/af_packet.c:3489
Write of size 165 at addr ffffc9000385fb78 by task syz-executor233/3631
CPU: 0 PID: 3631 Comm: syz-executor233 Not tainted 5.17.0-rc7-syzkaller-02396-g0b3660695e80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xf/0x336 mm/kasan/report.c:255
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
memcpy+0x39/0x60 mm/kasan/shadow.c:66
memcpy include/linux/fortify-string.h:225 [inline]
packet_recvmsg+0x56c/0x1150 net/packet/af_packet.c:3489
sock_recvmsg_nosec net/socket.c:948 [inline]
sock_recvmsg net/socket.c:966 [inline]
sock_recvmsg net/socket.c:962 [inline]
____sys_recvmsg+0x2c4/0x600 net/socket.c:2632
___sys_recvmsg+0x127/0x200 net/socket.c:2674
__sys_recvmsg+0xe2/0x1a0 net/socket.c:2704
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fdfd5954c29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcf8e71e48 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdfd5954c29
RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000005
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcf8e71e60
R13: 00000000000f4240 R14: 000000000000c1ff R15: 00007ffcf8e71e54
</TASK>
addr ffffc9000385fb78 is located in stack of task syz-executor233/3631 at offset 32 in frame:
____sys_recvmsg+0x0/0x600 include/linux/uio.h:246
this frame has 1 object:
[32, 160) ‘addr’
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/packet/af_packet.c"
],
"versions": [
{
"version": "0fb375fb9b93",
"lessThan": "b9d5772d60f8",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "b1e27cda1e3c",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "a33dd1e6693f",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "268dcf1f7b31",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "70b7b3c055fd",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "a055f5f2841f",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "ef591b351760",
"status": "affected",
"versionType": "git"
},
{
"version": "0fb375fb9b93",
"lessThan": "c700525fcc06",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/packet/af_packet.c"
],
"versions": [
{
"version": "2.6.14",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.14",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.9.308",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.273",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.236",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.187",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.108",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.31",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16.17",
"lessThanOrEqual": "5.16.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/268dcf1f7b3193bc446ec3d14e08a240e9561e4d
git.kernel.org/stable/c/70b7b3c055fd4a464da8da55ff4c1f84269f9b02
git.kernel.org/stable/c/a055f5f2841f7522b44a2b1eccb1951b4b03d51a
git.kernel.org/stable/c/a33dd1e6693f80d805155b3f69c18c2f642915da
git.kernel.org/stable/c/b1e27cda1e3c12b705875bb7e247a97168580e33
git.kernel.org/stable/c/b9d5772d60f8e7ef34e290f72fc20e3a4883e7d0
git.kernel.org/stable/c/c700525fcc06b05adfea78039de02628af79e07a
git.kernel.org/stable/c/ef591b35176029fdefea38e8388ffa371e18f4b2