cbcvebase.
CVE-2023-54112
published 2025-12-24

CVE-2023-54112: 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…

PriorityP419
EPSS
0.19%
8.6th percentile
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: [] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634 [] alloc_skb include/linux/skbuff.h:1289 [inline] [] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815 [] sock_sendmsg_nosec net/socket.c:725 [inline] [] sock_sendmsg+0x56/0xb0 net/socket.c:748 [] ____sys_sendmsg+0x365/0x470 net/socket.c:2494 [] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548 [] __sys_sendmsg+0xa6/0x120 net/socket.c:2577 [] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 [] entry_SYSCALL_64_after_hwframe+0x63/0xcd In kcm_sendmsg(), kcm_tx_msg(head)->last_skb is used as a cursor to append newly allocated skbs to 'head'. If some bytes are copied, an error occurred, and jumped to out_error label, 'last_skb' is left unmodified. A later kcm_sendmsg() will use an obsoleted 'last_skb' reference, corrupting the 'head' frag_list and causing the leak. This patch fixes this issue by properly updating the last allocated skb in 'last_skb'.

Affected

21 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.55-1 (bookworm)linux 6.1.55-1 (bookworm)
linuxlinux——
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 5e5554389397e98fafb9efe395d8b4830dd5f0425e5554389397e98fafb9efe395d8b4830dd5f042
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 479c71cda14b3c3a6515773faa39055333eaa2b7479c71cda14b3c3a6515773faa39055333eaa2b7
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 33db24ad811b3576a0c2f8862506763f2be925b033db24ad811b3576a0c2f8862506763f2be925b0
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 97275339c34cfbccd65e87bc38fd910ae66c48ba97275339c34cfbccd65e87bc38fd910ae66c48ba
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < 16989de75497574b5fafd174c0c233d5a86858b716989de75497574b5fafd174c0c233d5a86858b7
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < af8085e0fc3207ecbf8b9e7a635c790e36d058c6af8085e0fc3207ecbf8b9e7a635c790e36d058c6
linuxlinux>= ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 < c821a88bd720b0046433173185fd841a100d44adc821a88bd720b0046433173185fd841a100d44ad
linuxlinux_kernel>= 0 < 5.10.197-15.10.197-1
linuxlinux_kernel>= 0 < 6.1.55-16.1.55-1
linuxlinux_kernel>= 0 < 6.5.6-16.5.6-1
linuxlinux_kernel>= 0 < 6.5.6-16.5.6-1
linuxlinux_kernel>= 4.15.0 < 4.19.2954.19.295
linuxlinux_kernel>= 4.20.0 < 5.4.2575.4.257
linuxlinux_kernel>= 4.6.0 < 4.14.3264.14.326
linuxlinux_kernel>= 5.11.0 < 5.15.1325.15.132
linuxlinux_kernel>= 5.16.0 < 6.1.546.1.54
linuxlinux_kernel>= 5.5.0 < 5.10.1955.10.195
linuxlinux_kernel>= 6.2.0 < 6.5.46.5.4
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