bpf: Fix potential UAF when reading bpf link info
Summary
| CVE | CVE-2026-90392 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-17 17:17:38 UTC |
| Updated | 2026-09-18 18:17:56 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF when reading bpf link info In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is accessed without holding any locks. If the prog is concurrently replaced via bpf_link_update, the old prog can be freed, leading to a potential UAF issue. Fix this by accessing link->prog under RCU protection to safely fetch the pointer and guarantee its lifetime while reading its fields. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.001630000 probability, percentile 0.059900000 (date 2026-09-19)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab a5c936ac904767fc1d943d40b0308bcb2ae2509b git | Not specified |
| CNA | Linux | Linux | affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab d7d7208e2603b45724b684f4df73904fb347741e git | Not specified |
| CNA | Linux | Linux | affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab 85cf991c881e7198be32be05a9daa2625390c8b3 git | Not specified |
| CNA | Linux | Linux | affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab 79347e42cfbc9e78872922e8f08a70609c9af82f git | Not specified |
| CNA | Linux | Linux | affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab 863f3ddd0b8ac65abfb50d3be0869268ac0e277b git | Not specified |
| CNA | Linux | Linux | affected 5.7 | Not specified |
| CNA | Linux | Linux | unaffected 5.7 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.157 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.110 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.52 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.6 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.