bpf: Fix UAF in sock clone early bailouts
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix UAF in sock clone early bailouts Similar to recent commit 9b51a6155d14 ("bpf,fork: wipe ->bpf_storage before bailouts that access it"), sk_clone() performs an initial shallow copy of the socket field ->sk_bpf_storage via sock_copy() for the cloned socket newsk. If sk_clone() bails out early (e.g. if sk_filter_charge() fails) prior to calling bpf_sk_storage_clone(), newsk->sk_bpf_storage still points to the parent socket's BPF local storage. When newsk is subsequently freed via sk_free(), the deallocation path (__sk_destruct() -> bpf_sk_storage_free()) destroys the parent socket's BPF local storage, leading to a use-after-free (UAF) on the parent socket. Fix this by resetting newsk->sk_bpf_storage to NULL immediately after sock_copy() in sk_clone(), and remove the now redundant initialization from bpf_sk_storage_clone().
CVE-2026-68399
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-2026-68399
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": "6ac99e8f23d4b10258406ca0dd7bffca5f31da9d",
"lessThan": "f6814814b3bdd6ecb6bc1fc53ba4e827e0185f01",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac99e8f23d4b10258406ca0dd7bffca5f31da9d",
"lessThan": "24139461545e44442df9b80deace26b2eb3e103d",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac99e8f23d4b10258406ca0dd7bffca5f31da9d",
"lessThan": "01f8a354497ba739f81b691b3702bc4c46500a4d",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac99e8f23d4b10258406ca0dd7bffca5f31da9d",
"lessThan": "14b49b5ab29979552c219a09e569b424fbbf4a6e",
"versionType": "git"
},
{
"status": "affected",
"version": "6ac99e8f23d4b10258406ca0dd7bffca5f31da9d",
"lessThan": "7cbd0c4cebe4c9f678d15e6b9ba975e1155a107f",
"versionType": "git"
}
],
"programFiles": [
"net/core/bpf_sk_storage.c",
"net/core/sock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/bpf_sk_storage.c",
"net/core/sock.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68399
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46469 · Revision 1
- Added to Heist Feed
- Publisher date