CVE-2023-54112

/// Technical description

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

kcm: Fix memory leak in error path of kcm_sendmsg()

syzbot reported a memory leak like below:

BUG: memory leak

unreferenced object 0xffff88810b088c00 (size 240):

comm "syz-executor186", pid 5012, jiffies 4294943306 (age 13.680s)

hex dump (first 32 bytes):

00 89 08 0b 81 88 ff ff 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:

[<ffffffff83e5d5ff>] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634

[<ffffffff84606e59>] alloc_skb include/linux/skbuff.h:1289 [inline]

[<ffffffff84606e59>] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815

[<ffffffff83e479c6>] sock_sendmsg_nosec net/socket.c:725 [inline]

[<ffffffff83e479c6>] sock_sendmsg+0x56/0xb0 net/socket.c:748

[<ffffffff83e47f55>] ____sys_sendmsg+0x365/0x470 net/socket.c:2494

[<ffffffff83e4c389>] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548

[<ffffffff83e4c536>] _

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References