netfilter: ctnetlink: remove refcounting in expectation dumpers
In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers Same pattern as previous patch: do not keep the expectation object alive via refcount, only store a cookie value and then use that as the skip hint for dump resumption. AFAICS this has the same issue as the one resolved in the conntrack dumper, when we do if (!refcount_inc_not_zero(&exp->use)) to increment the refcount, there is a chance that exp == last, which causes a double-increment of the refcount and subsequent memory leak.
CVE-2025-39764
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-2025-39764
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": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "b05500444b8eb97644efdd180839a04a706be97c",
"versionType": "git"
},
{
"status": "affected",
"version": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "bada48ad5b0590e318d0f79636ff62a2ef9f4955",
"versionType": "git"
},
{
"status": "affected",
"version": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "64b7684042246e3238464c66894e30ba30c7e851",
"versionType": "git"
},
{
"status": "affected",
"version": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "9e5021a906532ca16e2aac69c0607711e1c70b1f",
"versionType": "git"
},
{
"status": "affected",
"version": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "078d33c95bf534d37aa04269d1ae6158e20082d5",
"versionType": "git"
},
{
"status": "affected",
"version": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "a4d634ded4d3d400f115d84f654f316f249531c9",
"versionType": "git"
},
{
"status": "affected",
"version": "cf6994c2b9812a9f02b99e89df411ffc5db9c779",
"lessThan": "1492e3dcb2be3aa46d1963da96aa9593e4e4db5a",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_netlink.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.23"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.23",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.2",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_netlink.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39764
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27064 · Revision 1
- Added to Heist Feed
- Publisher date