CVE-2026-80731

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Source
https://cve.org/CVERecord?id=CVE-2026-80731
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80731.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-80731
Downstream
AZL (1)
BELL (1)
DEBIAN (1)
MGASA (1)
openSUSE (1)
SUSE (9)
UBUNTU (1)
Related
openSUSE (1)
SUSE (9)
Published
2026-09-03T08:21:48Z
Modified
2026-10-20T17:27:17Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header
Details

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

net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header

dev_validate_header() reads dev->hard_header_len directly when zero-padding short link layer headers for CAP_SYS_RAWIO holders:

if (capable(CAP_SYS_RAWIO)) {
    memset(ll_header + len, 0, dev->hard_header_len - len);
    return true;
}

Packet send paths call dev_validate_header() on skbs whose headroom was allocated from an earlier hard_header_len read. If the device is reconfigured so that dev->hard_header_len increases before validation, the memset writes past the reserved buffer, an out-of-bounds write.

This out-of-bounds write is masked in some SOCK_RAW paths today because the same concurrent increase can first make skb_push() exceed the reserved headroom and trigger skb_under_panic(). Remove the zero-padding branch before making those hard_header_len reads consistent, so the snapshot fixes do not turn a loud panic into a silent overwrite.

This path is only reached for variable length L2 protocols, where len < hard_header_len but len >= min_header_len. No remaining in-tree variable length L2 protocol implements header_ops->validate, and the CAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no real value beyond allowing testing of intentionally malformed input.

Drop the CAP_SYS_RAWIO branch. The remaining reads of dev->hard_header_len in dev_validate_header() are comparisons only and have no memory safety impact.

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80731.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
b5518429e70cd783b8ca52335456172c1a0589f6
Fixed
53fd7f912c0877647d6a1e1877f5ea8535ee0b4a
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
2793a23aacbd754dbbb5cb75093deb7e4103bace
Fixed
fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6
Fixed
8fc9816404166a90ed8d544dc52482fafffb6d9f
Fixed
b0f92a5731dc82556a9ae005cc35f71ab136307b
Fixed
99df6b7a713f96eda206680d100b76e15f9d9b69
Fixed
74e035f07f53feca09e2352e77fccb09cad5e208
Fixed
dbb30dc943a93e083f1e531bfdc6779e57de40d0
Fixed
fc902f52a02298c7432b2334c0c82a2885a1a8b6
Fixed
3b9a324e646d3657a8d9806dfbfe4f3e4066e882
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.2.80
Fixed
3.2.81
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.16.36
Fixed
3.17
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
4.1.28
Fixed
4.2
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
4.4.8
Fixed
4.5
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
4.5.2
Fixed
4.6
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f58a6c08ebdfa978178bbca78c2ba744a2665912
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1df16498dfd0d5a129bdf2982d9a08df73e8923d
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
8b8d278aa4de9335682bbd4a3bb619af015c859e
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
6804052fa9d86e9a512c88b24a5debbfc1a490fc

Affected versions

v3.*
v3.16.36
v3.16.37
v3.16.38
v3.16.39
v3.16.40
v3.16.41
v3.16.42
v3.16.43
v3.16.44
v3.16.45
v3.16.46
v3.16.47
v3.16.48
v3.16.49
v3.16.50
v3.16.51
v3.16.52
v3.16.53
v3.16.54
v3.16.55
v3.16.56
v3.16.57
v3.16.58
v3.16.59
v3.16.60
v3.16.61
v3.16.62
v3.16.63
v3.16.64
v3.16.65
v3.16.66
v3.16.67
v3.16.68
v3.16.69
v3.16.70
v3.16.71
v3.16.72
v3.16.73
v3.16.74
v3.16.75
v3.16.76
v3.16.77
v3.16.78
v3.16.79
v3.16.80
v3.16.81
v3.16.82
v3.16.83
v3.16.84
v3.16.85
v3.2.80
v4.*
v4.1.28
v4.1.29
v4.1.30
v4.1.31
v4.1.32
v4.1.33
v4.1.34
v4.1.35
v4.1.36
v4.1.37
v4.1.38
v4.1.39
v4.1.40
v4.1.41
v4.1.42
v4.1.43
v4.1.44
v4.1.45
v4.1.46
v4.1.47
v4.1.48
v4.1.49
v4.1.50
v4.1.51
v4.1.52
v4.4.10
v4.4.100
v4.4.101
v4.4.102
v4.4.103
v4.4.104
v4.4.105
v4.4.106
v4.4.107
v4.4.108
v4.4.109
v4.4.11
v4.4.110
v4.4.111
v4.4.112
v4.4.113
v4.4.114
v4.4.115
v4.4.116
v4.4.117
v4.4.118
v4.4.119
v4.4.12
v4.4.120
v4.4.121
v4.4.122
v4.4.123
v4.4.124
v4.4.125
v4.4.126
v4.4.127
v4.4.128
v4.4.129
v4.4.13
v4.4.130
v4.4.131
v4.4.132
v4.4.133
v4.4.134
v4.4.135
v4.4.136
v4.4.137
v4.4.138
v4.4.139
v4.4.14
v4.4.140
v4.4.141
v4.4.142
v4.4.143
v4.4.144
v4.4.145
v4.4.146
v4.4.147
v4.4.148
v4.4.149
v4.4.15
v4.4.150
v4.4.151
v4.4.152
v4.4.153
v4.4.154
v4.4.155
v4.4.156
v4.4.157
v4.4.158
v4.4.159
v4.4.16
v4.4.160
v4.4.161
v4.4.162
v4.4.163
v4.4.164
v4.4.165
v4.4.166
v4.4.167
v4.4.168
v4.4.169
v4.4.17
v4.4.170
v4.4.171
v4.4.172
v4.4.173
v4.4.174
v4.4.175
v4.4.176
v4.4.177
v4.4.178
v4.4.179
v4.4.18
v4.4.180
v4.4.181
v4.4.182
v4.4.183
v4.4.184
v4.4.185
v4.4.186
v4.4.187
v4.4.188
v4.4.189
v4.4.19
v4.4.190
v4.4.191
v4.4.192
v4.4.193
v4.4.194
v4.4.195
v4.4.196
v4.4.197
v4.4.198
v4.4.199
v4.4.20
v4.4.200
v4.4.201
v4.4.202
v4.4.203
v4.4.204
v4.4.205
v4.4.206
v4.4.207
v4.4.208
v4.4.209
v4.4.21
v4.4.210
v4.4.211
v4.4.212
v4.4.213
v4.4.214
v4.4.215
v4.4.216
v4.4.217
v4.4.218
v4.4.219
v4.4.22
v4.4.220
v4.4.221
v4.4.222
v4.4.223
v4.4.224
v4.4.225
v4.4.226
v4.4.227
v4.4.228
v4.4.229
v4.4.23
v4.4.230
v4.4.231
v4.4.232
v4.4.233
v4.4.234
v4.4.235
v4.4.236
v4.4.237
v4.4.238
v4.4.239
v4.4.24
v4.4.240
v4.4.241
v4.4.242
v4.4.243
v4.4.244
v4.4.245
v4.4.246
v4.4.247
v4.4.248
v4.4.249
v4.4.25
v4.4.250
v4.4.251
v4.4.252
v4.4.253
v4.4.254
v4.4.255
v4.4.256
v4.4.257
v4.4.258
v4.4.259
v4.4.26
v4.4.260
v4.4.261
v4.4.262
v4.4.263
v4.4.264
v4.4.265
v4.4.266
v4.4.267
v4.4.268
v4.4.269
v4.4.27
v4.4.270
v4.4.271
v4.4.272
v4.4.273
v4.4.274
v4.4.275
v4.4.276
v4.4.277
v4.4.278
v4.4.279
v4.4.28
v4.4.280
v4.4.281
v4.4.282
v4.4.283
v4.4.284
v4.4.285
v4.4.286
v4.4.287
v4.4.288
v4.4.289
v4.4.29
v4.4.290
v4.4.291
v4.4.292
v4.4.293
v4.4.294
v4.4.295
v4.4.296
v4.4.297
v4.4.298
v4.4.299
v4.4.30
v4.4.300
v4.4.301
v4.4.302
v4.4.31
v4.4.32
v4.4.33
v4.4.34
v4.4.35
v4.4.36
v4.4.37
v4.4.38
v4.4.39
v4.4.40
v4.4.41
v4.4.42
v4.4.43
v4.4.44
v4.4.45
v4.4.46
v4.4.47
v4.4.48
v4.4.49
v4.4.50
v4.4.51
v4.4.52
v4.4.53
v4.4.54
v4.4.55
v4.4.56
v4.4.57
v4.4.58
v4.4.59
v4.4.60
v4.4.61
v4.4.62
v4.4.63
v4.4.64
v4.4.65
v4.4.66
v4.4.67
v4.4.68
v4.4.69
v4.4.70
v4.4.71
v4.4.72
v4.4.73
v4.4.74
v4.4.75
v4.4.76
v4.4.77
v4.4.78
v4.4.79
v4.4.8
v4.4.80
v4.4.81
v4.4.82
v4.4.83
v4.4.84
v4.4.85
v4.4.86
v4.4.87
v4.4.88
v4.4.89
v4.4.9
v4.4.90
v4.4.91
v4.4.92
v4.4.93
v4.4.94
v4.4.95
v4.4.96
v4.4.97
v4.4.98
v4.4.99
v4.5.2
v4.5.3
v4.5.4
v4.5.5
v4.5.6
v4.5.7

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80731.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.2.81
Type
ECOSYSTEM
Events
Introduced
3.3.0
Fixed
5.10.265
Type
ECOSYSTEM
Events
Introduced
4.6.0
Fixed
5.15.216
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
6.1.183
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.6.152
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.12.104
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.18.45
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
7.1.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80731.json"