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CVE-2025-68263

Updated on 16 Dec 2025

Severity

7.0 High severity

Details

CVSS score
7.0
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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

ksmbd: ipc: fix use-after-free in ipc_msg_send_request

ipc_msg_send_request() waits for a generic netlink reply using an ipc_msg_table_entry on the stack. The generic netlink handler (handle_generic_event()/handle_response()) fills entry->response under ipc_msg_table_lock, but ipc_msg_send_request() used to validate and free entry->response without holding the same lock.

Under high concurrency this allows a race where handle_response() is copying data into entry->response while ipc_msg_send_request() has just freed it, leading to a slab-use-after-free reported by KASAN in handle_generic_event():

BUG: KASAN: slab-use-after-free in handle_generic_event+0x3c4/0x5f0 [ksmbd] Write of size 12 at addr ffff888198ee6e20 by task pool/109349 … Freed by task: kvfree ipc_msg_send_request [ksmbd] ksmbd_rpc_open -> ksmbd_session_rpc_open [ksmbd]

Fix by:

  • Taking ipc_msg_table_lock in ipc_msg_send_request() while validating entry->response, freeing it when invalid, and removing the entry from ipc_msg_table.
  • Returning the final entry->response pointer to the caller only after the hash entry is removed under the lock.
  • Returning NULL in the error path, preserving the original API semantics.

This makes all accesses to entry->response consistent with handle_response(), which already updates and fills the response buffer under ipc_msg_table_lock, and closes the race that allowed the UAF.

Details

Affected product:
Ubuntu 20.04 ELS
Affected packages:
linux @ 5.4.0 (+1 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
Debian 12 Planned —
Debian 13 Will Not Fix —
Proxmox VE 7 5.15 Released
47 kernels
  • 5.15.5-1-pve-5.15.5-1
  • 5.15.12-1-pve-5.15.12-2
  • 5.15.12-1-pve-5.15.12-3
  • 5.15.17-1-pve-5.15.17-1
  • 5.15.19-1-pve-5.15.19-1
  • 5.15.19-2-pve-5.15.19-2
  • 5.15.19-2-pve-5.15.19-3
  • 5.15.27-1-pve-5.15.27-1
  • 5.15.30-1-pve-5.15.30-1
  • 5.15.30-2-pve-5.15.30-3
  • 5.15.35-1-pve-5.15.35-1
  • 5.15.35-1-pve-5.15.35-2
  • 5.15.35-1-pve-5.15.35-3
  • 5.15.35-2-pve-5.15.35-4
  • 5.15.35-2-pve-5.15.35-5
  • 5.15.35-3-pve-5.15.35-6
  • 5.15.39-1-pve-5.15.39-1
  • 5.15.39-2-pve-5.15.39-2
  • 5.15.39-3-pve-5.15.39-3
  • 5.15.39-4-pve-5.15.39-4
  • 5.15.7-1-pve-5.15.7-1
  • 5.15.53-1-pve-5.15.53-1
  • 5.15.60-1-pve-5.15.60-1
  • 5.15.60-2-pve-5.15.60-2
  • 5.15.64-1-pve-5.15.64-1
  • 5.15.74-1-pve-5.15.74-1
  • 5.15.83-1-pve-5.15.83-1
  • 5.15.102-1-pve-5.15.102-1
  • 5.15.104-1-pve-5.15.104-1
  • 5.15.104-1-pve-5.15.104-2
  • 5.15.107-1-pve-5.15.107-1
  • 5.15.107-2-pve-5.15.107-2
  • 5.15.85-1-pve-5.15.85-1
  • 5.15.108-1-pve-5.15.108-1
  • 5.15.108-1-pve-5.15.108-2
  • 5.15.116-1-pve-5.15.116-1
  • 5.15.126-1-pve-5.15.126-1
  • 5.15.131-1-pve-5.15.131-1
  • 5.15.131-1-pve-5.15.131-2
  • 5.15.131-2-pve-5.15.131-3
  • 5.15.136-1-pve-5.15.136-1
  • 5.15.111-1-pve-5.15.111-1
  • 5.15.143-1-pve-5.15.143-1
  • 5.15.149-1-pve-5.15.149-1
  • 5.15.152-1-pve-5.15.152-1
  • 5.15.158-1-pve_5.15.158-1
  • 5.15.158-2-pve_5.15.158-2
Ubuntu 20.04 HWE AWS Released
57 kernels
  • 5.15.0-1026.30~20.04.2
  • 5.15.0-1022.26~20.04.1
  • 5.15.0-1023.27~20.04.1
  • 5.15.0-1021.25~20.04.1
  • 5.15.0-1020.24~20.04.1
  • 5.15.0-1017.21~20.04.1
  • 5.15.0-1019.23~20.04.1
  • 5.15.0-1014.18~20.04.1
  • 5.15.0-1015.19~20.04.1
  • 5.15.0-1018.22~20.04.1
  • 5.15.0-1027.31~20.04.1
  • 5.15.0-1028.32~20.04.1
  • 5.15.0-1030.34~20.04.1
  • 5.15.0-1031.35~20.04.1
  • 5.15.0-1033.37~20.04.1
  • 5.15.0-1034.38~20.04.1
  • 5.15.0-1035.39~20.04.1
  • 5.15.0-1036.40~20.04.1
  • 5.15.0-1037.41~20.04.1
  • 5.15.0-1038.43~20.04.1
  • 5.15.0-1039.44~20.04.1
  • 5.15.0-1040.45~20.04.1
  • 5.15.0-1041.46~20.04.1
  • 5.15.0-1043.48~20.04.1
  • 5.15.0-1044.49~20.04.1
  • 5.15.0-1045.50~20.04.1
  • 5.15.0-1047.52~20.04.1
  • 5.15.0-1048.53~20.04.1
  • 5.15.0-1049.54~20.04.1
  • 5.15.0-1050.55~20.04.1
  • 5.15.0-1051.56~20.04.1
  • 5.15.0-1052.57~20.04.1
  • 5.15.0-1053.58~20.04.1
  • 5.15.0-1055.60~20.04.1
  • 5.15.0-1056.61~20.04.1
  • 5.15.0-1057.63~20.04.1
  • 5.15.0-1058.64~20.04.1
  • 5.15.0-1061.67~20.04.1
  • 5.15.0-1062.68~20.04.1
  • 5.15.0-1063.69~20.04.1
  • 5.15.0-1064.70~20.04.1
  • 5.15.0-1065.71~20.04.1
  • 5.15.0-1066.72~20.04.1
  • 5.15.0-1067.73~20.04.1
  • 5.15.0-1068.74~20.04.1
  • 5.15.0-1069.75~20.04.1
  • 5.15.0-1070.76~20.04.1
  • 5.15.0-1071.77~20.04.1
  • 5.15.0-1072.78~20.04.1
  • 5.15.0-1073.79~20.04.1
  • 5.15.0-1075.82~20.04.1
  • 5.15.0-1077.84~20.04.1
  • 5.15.0-1080.87~20.04.1
  • 5.15.0-1081.88~20.04.1
  • 5.15.0-1082.89~20.04.1
  • 5.15.0-1083.90~20.04.1
  • 5.15.0-1084.91~20.04.1
Ubuntu 20.04 HWE Azure Released
40 kernels
  • 5.15.0-1029.36~20.04.1
  • 5.15.0-1022.27~20.04.1
  • 5.15.0-1023.29~20.04.1
  • 5.15.0-1021.26~20.04.1
  • 5.15.0-1020.25~20.04.1
  • 5.15.0-1017.20~20.04.1
  • 5.15.0-1019.24~20.04.1
  • 5.15.0-1008.9~20.04.1
  • 5.15.0-1013.16~20.04.1
  • 5.15.0-1014.17~20.04.1
  • 5.15.0-1024.30~20.04.1
  • 5.15.0-1034.41~20.04.1
  • 5.15.0-1049.56~20.04.1
  • 5.15.0-1050.57~20.04.1
  • 5.15.0-1054.62~20.04.1
  • 5.15.0-1056.64~20.04.1
  • 5.15.0-1057.65~20.04.1
  • 5.15.0-1058.66~20.04.2
  • 5.15.0-1059.67~20.04.1
  • 5.15.0-1060.69~20.04.1
  • 5.15.0-1061.70~20.04.1
  • 5.15.0-1063.72~20.04.1
  • 5.15.0-1064.73~20.04.1
  • 5.15.0-1067.76~20.04.1
  • 5.15.0-1068.77~20.04.1
  • 5.15.0-1065.74~20.04.1
  • 5.15.0-1070.79~20.04.1
  • 5.15.0-1071.80~20.04.1
  • 5.15.0-1072.81~20.04.1
  • 5.15.0-1073.82~20.04.1
  • 5.15.0-1074.83~20.04.1
  • 5.15.0-1075.84~20.04.1
  • 5.15.0-1078.87~20.04.1
  • 5.15.0-1079.88~20.04.1
  • 5.15.0-1081.90~20.04.1
  • 5.15.0-1082.91~20.04.1
  • 5.15.0-1086.95~20.04.1
  • 5.15.0-1087.96~20.04.1
  • 5.15.0-1088.97~20.04.1
  • 5.15.0-1089.98~20.04.1
Ubuntu 22.04 Released
96 kernels
  • 5.15.0-27.28
  • 5.15.0-33.34
  • 5.15.0-37.39
  • 5.15.0-39.42
  • 5.15.0-25.25
  • 5.15.0-28.29
  • 5.15.0-29.30
  • 5.15.0-30.31
  • 5.15.0-41.44
  • 5.15.0-43.46
  • 5.15.0-46.49
  • 5.15.0-35.36
  • 5.15.0-47.51
  • 5.15.0-48.54
  • 5.15.0-40.43
  • 5.15.0-50.56
  • 5.15.0-52.58
  • 5.15.0-53.59
  • 5.15.0-56.62
  • 5.15.0-54.60
  • 5.15.0-57.63
  • 5.15.0-58.64
  • 5.15.0-60.66
  • 5.15.0-67.74
  • 5.15.0-69.76
  • 5.15.0-70.77
  • 5.15.0-71.78
  • 5.15.0-72.79
  • 5.15.0-68.75
  • 5.15.0-73.80
  • 5.15.0-75.82
  • 5.15.0-76.83
  • 5.15.0-78.85
  • 5.15.0-79.86
  • 5.15.0-82.91
  • 5.15.0-83.92
  • 5.15.0-84.93
  • 5.15.0-86.96
  • 5.15.0-74.81
  • 5.15.0-87.97
  • 5.15.0-88.98
  • 5.15.0-89.99
  • 5.15.0-91.101
  • 5.15.0-92.102
  • 5.15.0-94.104
  • 5.15.0-97.107
  • 5.15.0-100.110
  • 5.15.0-101.111
  • 5.15.0-102.112
  • 5.15.0-105.115
  • 5.15.0-106.116
  • 5.15.0-107.117
  • 5.15.0-112.122
  • 5.15.0-113.123
  • 5.15.0-116.126
  • 5.15.0-117.127
  • 5.15.0-118.128
  • 5.15.0-119.129
  • 5.15.0-121.131
  • 5.15.0-122.132
  • 5.15.0-124.134
  • 5.15.0-125.135
  • 5.15.0-127.137
  • 5.15.0-130.140
  • 5.15.0-126.136
  • 5.15.0-131.141
  • 5.15.0-128.138
  • 5.15.0-133.144
  • 5.15.0-134.145
  • 5.15.0-135.146
  • 5.15.0-136.147
  • 5.15.0-138.148
  • 5.15.0-139.149
  • 5.15.0-140.150
  • 5.15.0-141.151
  • 5.15.0-142.152
  • 5.15.0-143.153
  • 5.15.0-144.157
  • 5.15.0-151.161
  • 5.15.0-152.162
  • 5.15.0-153.163
  • 5.15.0-156.166
  • 5.15.0-157.167
  • 5.15.0-160.170
  • 5.15.0-161.171
  • 5.15.0-163.173
  • 5.15.0-164.174
  • 5.15.0-168.178
  • 5.15.0-170.180
  • 5.15.0-171.181
  • 5.15.0-173.183
  • 5.15.0-174.184
  • 5.15.0-176.186
  • 5.15.0-177.187
  • 5.15.0-179.189
  • 5.15.0-181.191
Ubuntu 22.04 AWS Released
87 kernels
  • 5.15.0-1005.7
  • 5.15.0-1008.10
  • 5.15.0-1011.14
  • 5.15.0-1013.17
  • 5.15.0-1015.19
  • 5.15.0-1017.21
  • 5.15.0-1009.11
  • 5.15.0-1020.24
  • 5.15.0-1021.25
  • 5.15.0-1022.26
  • 5.15.0-1023.27
  • 5.15.0-1026.30
  • 5.15.0-1004.6
  • 5.15.0-1014.18
  • 5.15.0-1018.22
  • 5.15.0-1024.29
  • 5.15.0-1027.31
  • 5.15.0-1028.32
  • 5.15.0-1030.34
  • 5.15.0-1031.35
  • 5.15.0-1033.37
  • 5.15.0-1034.38
  • 5.15.0-1035.39
  • 5.15.0-1036.40
  • 5.15.0-1032.36
  • 5.15.0-1037.41
  • 5.15.0-1038.43
  • 5.15.0-1039.44
  • 5.15.0-1040.45
  • 5.15.0-1042.47
  • 5.15.0-1043.48
  • 5.15.0-1044.49
  • 5.15.0-1045.50
  • 5.15.0-1047.52
  • 5.15.0-1048.53
  • 5.15.0-1049.54
  • 5.15.0-1050.55
  • 5.15.0-1051.56
  • 5.15.0-1052.57
  • 5.15.0-1053.58
  • 5.15.0-1055.60
  • 5.15.0-1056.61
  • 5.15.0-1057.63
  • 5.15.0-1060.66
  • 5.15.0-1061.67
  • 5.15.0-1062.68
  • 5.15.0-1063.69
  • 5.15.0-1064.70
  • 5.15.0-1065.71
  • 5.15.0-1066.72
  • 5.15.0-1067.73
  • 5.15.0-1068.74
  • 5.15.0-1069.75
  • 5.15.0-1070.76
  • 5.15.0-1071.77
  • 5.15.0-1072.78
  • 5.15.0-1073.79
  • 5.15.0-1076.83
  • 5.15.0-1078.85
  • 5.15.0-1079.86
  • 5.15.0-1080.87
  • 5.15.0-1081.88
  • 5.15.0-1082.89
  • 5.15.0-1083.90
  • 5.15.0-1084.91
  • 5.15.0-1085.92
  • 5.15.0-1086.93
  • 5.15.0-1087.94
  • 5.15.0-1088.95
  • 5.15.0-1089.96
  • 5.15.0-1090.97
  • 5.15.0-1091.98
  • 5.15.0-1092.99
  • 5.15.0-1093.100
  • 5.15.0-1095.102
  • 5.15.0-1096.103
  • 5.15.0-1097.104
  • 5.15.0-1098.105
  • 5.15.0-1099.106
  • 5.15.0-1100.107
  • 5.15.0-1101.108
  • 5.15.0-1103.110
  • 5.15.0-1104.111
  • 5.15.0-1105.112
  • 5.15.0-1106.113
  • 5.15.0-1108.115
  • 5.15.0-1109.116
Ubuntu 22.04 Azure Released
77 kernels
  • 5.15.0-1005.6
  • 5.15.0-1007.8
  • 5.15.0-1010.12
  • 5.15.0-1012.15
  • 5.15.0-1014.17
  • 5.15.0-1017.20
  • 5.15.0-1008.9
  • 5.15.0-1019.24
  • 5.15.0-1020.25
  • 5.15.0-1021.26
  • 5.15.0-1022.27
  • 5.15.0-1003.4
  • 5.15.0-1013.16
  • 5.15.0-1023.29
  • 5.15.0-1029.36
  • 5.15.0-1024.30
  • 5.15.0-1034.41
  • 5.15.0-1035.42
  • 5.15.0-1036.43
  • 5.15.0-1037.44
  • 5.15.0-1038.45
  • 5.15.0-1039.46
  • 5.15.0-1040.47
  • 5.15.0-1041.48
  • 5.15.0-1042.49
  • 5.15.0-1045.52
  • 5.15.0-1046.53
  • 5.15.0-1047.54
  • 5.15.0-1049.56
  • 5.15.0-1044.51
  • 5.15.0-1050.57
  • 5.15.0-1051.59
  • 5.15.0-1052.60
  • 5.15.0-1053.61
  • 5.15.0-1054.62
  • 5.15.0-1056.64
  • 5.15.0-1057.65
  • 5.15.0-1058.66
  • 5.15.0-1059.67
  • 5.15.0-1060.69
  • 5.15.0-1061.70
  • 5.15.0-1063.72
  • 5.15.0-1064.73
  • 5.15.0-1066.75
  • 5.15.0-1067.76
  • 5.15.0-1068.77
  • 5.15.0-1070.79
  • 5.15.0-1071.80
  • 5.15.0-1072.81
  • 5.15.0-1073.82
  • 5.15.0-1074.83
  • 5.15.0-1075.84
  • 5.15.0-1078.87
  • 5.15.0-1079.88
  • 5.15.0-1081.90
  • 5.15.0-1082.91
  • 5.15.0-1084.93
  • 5.15.0-1086.95
  • 5.15.0-1087.96
  • 5.15.0-1088.97
  • 5.15.0-1089.98
  • 5.15.0-1090.99
  • 5.15.0-1091.100
  • 5.15.0-1092.101
  • 5.15.0-1094.103
  • 5.15.0-1095.104
  • 5.15.0-1096.105
  • 5.15.0-1097.106
  • 5.15.0-1098.107
  • 5.15.0-1101.110
  • 5.15.0-1102.111
  • 5.15.0-1099.108
  • 5.15.0-1103.112
  • 5.15.0-1109.118
  • 5.15.0-1110.119
  • 5.15.0-1111.120
  • 5.15.0-1114.123
Ubuntu 24.04 Planned —
Ubuntu 24.04 AWS Planned —