Description

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

net: can: j1939: Initialize unused data in j1939_send_one()

syzbot reported kernel-infoleak in raw_recvmsg() [1]. j1939_send_one()
creates full frame including unused data, but it doesn't initialize
it. This causes the kernel-infoleak issue. Fix this by initializing
unused data.

[1]
BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline]
BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:29 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185
instrument_copy_to_user include/linux/instrumented.h:114 [inline]
copy_to_user_iter lib/iov_iter.c:24 [inline]
iterate_ubuf include/linux/iov_iter.h:29 [inline]
iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
_copy_to_iter+0x366/0x2520 lib/iov_iter.c:185
copy_to_iter include/linux/uio.h:196 [inline]
memcpy_to_msg include/linux/skbuff.h:4113 [inline]
raw_recvmsg+0x2b8/0x9e0 net/can/raw.c:1008
sock_recvmsg_nosec net/socket.c:1046 [inline]
sock_recvmsg+0x2c4/0x340 net/socket.c:1068
____sys_recvmsg+0x18a/0x620 net/socket.c:2803
___sys_recvmsg+0x223...

Classification

CVE ID: CVE-2024-42076

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/5e4ed38eb17eaca42de57d500cc0f9668d2b6abf
https://git.kernel.org/stable/c/a2a0ebff7fdeb2f66e29335adf64b9e457300dd4
https://git.kernel.org/stable/c/4c5dc3927e17489c1cae6f48c0d5e4acb4cae01f
https://git.kernel.org/stable/c/f97cbce633923588307049c4aef9feb2987e371b
https://git.kernel.org/stable/c/ab2a683938ba4416d389c2f5651cbbb2c41b779f
https://git.kernel.org/stable/c/ba7e5ae8208ac07d8e1eace0951a34c169a2d298
https://git.kernel.org/stable/c/b7cdf1dd5d2a2d8200efd98d1893684db48fe134

Timeline