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UBUNTU-CVE-2024-49883

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UBUNTU-CVE-2024-49883

Published: 21 Oct 2024Last Modified: 8 Oct 2026

Upstream:

Aliases:

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: ext4: aovid use-after-free in ext4_ext_insert_extent() As Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is reallocated in ext4_ext_create_new_leaf(), we'll use the stale path and cause UAF. Below is a sample trace with dummy values: ext4_ext_insert_extent path = *ppath = 2000 ext4_ext_create_new_leaf(ppath) ext4_find_extent(ppath) path = *ppath = 2000 if (depth > path[0].p_maxdepth) kfree(path = 2000); *ppath = path = NULL; path = kcalloc() = 3000 *ppath = 3000; return path; /* here path is still 2000, UAF! */ eh = path[depth].p_hdr ================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330 Read of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179 CPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866 Call Trace: <TASK> ext4_ext_insert_extent+0x26d4/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 [...] Allocated by task 179: ext4_find_extent+0x81c/0x1f70 ext4_ext_map_blocks+0x146/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] Freed by task 179: kfree+0xcb/0x240 ext4_find_extent+0x7c0/0x1f70 ext4_ext_insert_extent+0xa26/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] ================================================================== So use *ppath to update the path to avoid the above problem.

Affected packages

Package

Name: linux-aws

Purl: pkg:deb/ubuntu/linux-aws?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM

Events:

Introduced- 0

Fixed -4.4.0-1146.152

Affected versions

4.4.0-1002.2

4.4.0-1003.3

4.4.0-1005.5

4.4.0-1006.6

4.4.0-1009.9

4.4.0-1010.10

4.4.0-1011.11

4.4.0-1012.12

4.4.0-1014.14

4.4.0-1016.16

4.4.0-1017.17

4.4.0-1019.19

4.4.0-1022.22

4.4.0-1023.23

4.4.0-1024.25

4.4.0-1025.26

4.4.0-1027.30

4.4.0-1028.31

4.4.0-1029.32

4.4.0-1031.34

4.4.0-1032.35

4.4.0-1034.37

4.4.0-1036.39

4.4.0-1037.40

4.4.0-1038.41

4.4.0-1039.42

4.4.0-1040.43

4.4.0-1042.45

4.4.0-1044.47

4.4.0-1045.48

4.4.0-1046.50

4.4.0-1048.52

4.4.0-1050.54

4.4.0-1052.56

4.4.0-1054.58

4.4.0-1055.59

4.4.0-1056.60

4.4.0-1058.62

4.4.0-1059.63

4.4.0-1060.64

4.4.0-1061.65

4.4.0-1062.66

4.4.0-1064.68

4.4.0-1065.69

4.4.0-1066.70

4.4.0-1067.71

4.4.0-1073.77

4.4.0-1074.78

4.4.0-1075.79

4.4.0-1076.80

4.4.0-1077.81

4.4.0-1078.82

4.4.0-1081.85

4.4.0-1082.86

4.4.0-1083.87

4.4.0-1085.89

4.4.0-1086.90

4.4.0-1087.91

4.4.0-1088.92

4.4.0-1090.94

4.4.0-1091.95

4.4.0-1092.96

4.4.0-1093.97

4.4.0-1094.99

4.4.0-1095.100

4.4.0-1096.101

4.4.0-1097.102

4.4.0-1098.103

4.4.0-1099.104

4.4.0-1101.106

4.4.0-1102.107

4.4.0-1103.108

4.4.0-1104.109

4.4.0-1107.113

4.4.0-1109.115

4.4.0-1110.116

4.4.0-1111.117

4.4.0-1112.118

4.4.0-1113.119

4.4.0-1114.120

4.4.0-1115.121

4.4.0-1116.122

4.4.0-1117.123

4.4.0-1118.124

4.4.0-1119.125

4.4.0-1120.126

4.4.0-1121.127

4.4.0-1122.128

4.4.0-1123.129

4.4.0-1124.130

4.4.0-1125.131

4.4.0-1127.133

4.4.0-1128.134

4.4.0-1129.135

4.4.0-1130.136

4.4.0-1131.137

4.4.0-1133.139

4.4.0-1134.140

4.4.0-1135.141

4.4.0-1136.142

4.4.0-1137.143

4.4.0-1138.144

4.4.0-1139.145

4.4.0-1140.146

4.4.0-1141.147

4.4.0-1142.148

4.4.0-1143.149

4.4.0-1144.150

4.4.0-1145.151

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High