CVE-2026-97923

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Source
https://cve.org/CVERecord?id=CVE-2026-97923
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97923.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-97923
Downstream
Related
Published
2026-09-25T10:22:42Z
Modified
2026-10-09T17:27:00Z
Summary
tracing: Free histogram the var ref when its initialization fails
Details

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

tracing: Free histogram the var ref when its initialization fails

create_var_ref() allocates a VAR_REF hist_field and then calls init_var_ref() to fill it in. When that fails the field is leaked.

commit 656fe2ba85e8 ("tracing: Use hist trigger's var_ref array to destroy var_refs") made destroy_hist_field() return early for HIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's var_refs[] array instead. create_var_ref() adds the field to that array only after init_var_ref() has succeeded, so on this path the field is in neither place and nothing frees it. The call was correct when it was written, before var refs were taken out of destroy_hist_field().

init_var_ref() cannot free it either. The caller owns the field, so init_var_ref() undoes only its own string allocations and leaves the field alone. Freeing it there would leave create_var_ref() passing freed memory to destroy_hist_field(), which reads its flags.

Call __destroy_hist_field(), which frees the field without consulting the flag.

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97923.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
656fe2ba85e81d00e4447bf77b8da2be3c47acb2
Fixed
608b7751926ec08fae6a1ac4e7308195da68c362
Fixed
4870f9071c9ea3c1423a07741b85a794db30d672
Fixed
352f84a381e7b4651b30366e93cb858f3fa9c91a
Fixed
4924328d6991f25b65bb7c8ff5d56c2a9b254851
Fixed
74375caa20fe5165807b4334c783d1790b01f02a
Fixed
222abcbe7866fef04563b6eb89fb21f627dcbc77
Fixed
a69baeac38677270656e85753d93856a076dee57
Fixed
516001d53e6b2ea95a251ee2ef54a1a689a3fd58
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
4.19.100
Fixed
4.20
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
836717841a30d7845cdf9cb806ee0ff3bfa7135a

Affected versions

v4.*
v4.19.100
v4.19.101
v4.19.102
v4.19.103
v4.19.104
v4.19.105
v4.19.106
v4.19.107
v4.19.108
v4.19.109
v4.19.110
v4.19.111
v4.19.112
v4.19.113
v4.19.114
v4.19.115
v4.19.116
v4.19.117
v4.19.118
v4.19.119
v4.19.120
v4.19.121
v4.19.122
v4.19.123
v4.19.124
v4.19.125
v4.19.126
v4.19.127
v4.19.128
v4.19.129
v4.19.130
v4.19.131
v4.19.132
v4.19.133
v4.19.134
v4.19.135
v4.19.136
v4.19.137
v4.19.138
v4.19.139
v4.19.140
v4.19.141
v4.19.142
v4.19.143
v4.19.144
v4.19.145
v4.19.146
v4.19.147
v4.19.148
v4.19.149
v4.19.150
v4.19.151
v4.19.152
v4.19.153
v4.19.154
v4.19.155
v4.19.156
v4.19.157
v4.19.158
v4.19.159
v4.19.160
v4.19.161
v4.19.162
v4.19.163
v4.19.164
v4.19.165
v4.19.166
v4.19.167
v4.19.168
v4.19.169
v4.19.170
v4.19.171
v4.19.172
v4.19.173
v4.19.174
v4.19.175
v4.19.176
v4.19.177
v4.19.178
v4.19.179
v4.19.180
v4.19.181
v4.19.182
v4.19.183
v4.19.184
v4.19.185
v4.19.186
v4.19.187
v4.19.188
v4.19.189
v4.19.190
v4.19.191
v4.19.192
v4.19.193
v4.19.194
v4.19.195
v4.19.196
v4.19.197
v4.19.198
v4.19.199
v4.19.200
v4.19.201
v4.19.202
v4.19.203
v4.19.204
v4.19.205
v4.19.206
v4.19.207
v4.19.208
v4.19.209
v4.19.210
v4.19.211
v4.19.212
v4.19.213
v4.19.214
v4.19.215
v4.19.216
v4.19.217
v4.19.218
v4.19.219
v4.19.220
v4.19.221
v4.19.222
v4.19.223
v4.19.224
v4.19.225
v4.19.226
v4.19.227
v4.19.228
v4.19.229
v4.19.230
v4.19.231
v4.19.232
v4.19.233
v4.19.234
v4.19.235
v4.19.236
v4.19.237
v4.19.238
v4.19.239
v4.19.240
v4.19.241
v4.19.242
v4.19.243
v4.19.244
v4.19.245
v4.19.246
v4.19.247
v4.19.248
v4.19.249
v4.19.250
v4.19.251
v4.19.252
v4.19.253
v4.19.254
v4.19.255
v4.19.256
v4.19.257
v4.19.258
v4.19.259
v4.19.260
v4.19.261
v4.19.262
v4.19.263
v4.19.264
v4.19.265
v4.19.266
v4.19.267
v4.19.268
v4.19.269
v4.19.270
v4.19.271
v4.19.272
v4.19.273
v4.19.274
v4.19.275
v4.19.276
v4.19.277
v4.19.278
v4.19.279
v4.19.280
v4.19.281
v4.19.282
v4.19.283
v4.19.284
v4.19.285
v4.19.286
v4.19.287
v4.19.288
v4.19.289
v4.19.290
v4.19.291
v4.19.292
v4.19.293
v4.19.294
v4.19.295
v4.19.296
v4.19.297
v4.19.298
v4.19.299
v4.19.300
v4.19.301
v4.19.302
v4.19.303
v4.19.304
v4.19.305
v4.19.306
v4.19.307
v4.19.308
v4.19.309
v4.19.310
v4.19.311
v4.19.312
v4.19.313
v4.19.314
v4.19.315
v4.19.316
v4.19.317
v4.19.318
v4.19.319
v4.19.320
v4.19.321
v4.19.322
v4.19.323
v4.19.324
v4.19.325

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97923.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.0.0
Fixed
5.10.271
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.222
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.189
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.158
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.111
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.53
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.2.7

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97923.json"