xfrm: Wait for RCU readers during policy netns exit
In the Linux kernel, the following vulnerability has been resolved: xfrm: Wait for RCU readers during policy netns exit xfrm_policy_fini() frees the policy_bydst hash tables after flushing the policy work items and deleting all policies, but it does not wait for concurrent RCU readers to leave their read-side critical sections first. The policy_bydst tables are published via rcu_assign_pointer() and are looked up through rcu_dereference_check(), so netns teardown must also wait for an RCU grace period before freeing the table memory. Fix this by adding synchronize_rcu() before freeing the policy hash tables.
CVE-2026-43091
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-2026-43091
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": "e1e551bc56302b80ff930c966f9985095fb1b70d",
"lessThan": "b66920a3348c0f63ba18365248fa21fbf0b3a937",
"versionType": "git"
},
{
"status": "affected",
"version": "e1e551bc56302b80ff930c966f9985095fb1b70d",
"lessThan": "438b1f668ad58f46ce699bb48e4698a7839e3f9e",
"versionType": "git"
},
{
"status": "affected",
"version": "e1e551bc56302b80ff930c966f9985095fb1b70d",
"lessThan": "3733fce2871c9bca9dd18a1a23b1432ea215a094",
"versionType": "git"
},
{
"status": "affected",
"version": "e1e551bc56302b80ff930c966f9985095fb1b70d",
"lessThan": "33a3149dd81a1e2f52b80ee1e0fc380b39f3d028",
"versionType": "git"
},
{
"status": "affected",
"version": "e1e551bc56302b80ff930c966f9985095fb1b70d",
"lessThan": "069daad4f2ae9c5c108131995529d5f02392c446",
"versionType": "git"
}
],
"programFiles": [
"net/xfrm/xfrm_policy.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/xfrm_policy.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43091
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40022 · Revision 1
- Added to Heist Feed
- Publisher date