bpf: Fix potential UAF when reading bpf link info
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.
CVE-2026-90392
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90392
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "a5c936ac904767fc1d943d40b0308bcb2ae2509b",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "d7d7208e2603b45724b684f4df73904fb347741e",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "85cf991c881e7198be32be05a9daa2625390c8b3",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "79347e42cfbc9e78872922e8f08a70609c9af82f",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "863f3ddd0b8ac65abfb50d3be0869268ac0e277b",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/syscall.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/syscall.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90392
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36717 · Revision 1
- Added to Heist Feed
- Publisher date