bpf, cgroup: Fix storage null-ptr-deref after replacing prog
In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper. 3. link_update is called to replace prog A with prog B. The reason is that __cgroup_bpf_replace fails to alloc and assign the required cgrp storage for the incoming replacement prog. Consequently, the new prog inherits an uninit storage, leading to null-ptr-deref panic when kick the new prog. Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.
CVE-2026-90250
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-2026-90250
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": "16c8321ee40c420f8e02e09515a5126682ddf4ea",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "a033c950f6731be88a7da98604ed78f302f15b80",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "1ab3da12061d7ccb099f7e925fa2d865967a316a",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "12feca126831556dc7fabe5a3ba28fbd328768b6",
"versionType": "git"
},
{
"status": "affected",
"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
"lessThan": "3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/cgroup.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": "6.6.160",
"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/cgroup.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90250
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48643 · Revision 1
- Added to Heist Feed
- Publisher date