Linux Kernel up to 6.12.107/6.18.48/7.1.12/7.2.2 xfrm nat_keepalive_work race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.107/6.18.48/7.1.12/7.2.2. It has been declared as critical. This affects the function nat_keepalive_work of the component xfrm. Executing a manipulation can lead to race condition. This vulnerability is registered as CVE-2026-80845. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.107/6.18.48/7.1.12/7.2.2. It has been declared as critical. This vulnerability affects the function nat_keepalive_work of the component xfrm. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: xfrm: avoid lock inversion in nat keepalive work nat_keepalive_work() walks the state table while xfrm_state_walk() holds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock, which conflicts with the delete path taking the same locks in reverse order via xfrm_state_delete() and __xfrm_state_delete(). This creates an AB-BA deadlock that is reported by lockdep when a NAT keepalive worker races with SA deletion. Fix this by splitting the keepalive walk into two phases. First, collect the candidate states while the walk holds xfrm_state_lock and take a reference on each state. Then, after the walk completes, process each collected state and acquire x->lock without nesting it under xfrm_state_lock.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-80845 since 08/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/04/2026).

Upgrading to version 6.12.108, 6.18.49, 7.1.13, 7.2.3 or 7.3-rc1 eliminates this vulnerability. Applying the patch ea09210462316e5235a25eccb11ad0708d86615e/5c86c895d1cac81a71ead3005084c6265cf6a7a5/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d/a9fa05b7a1246797748d15771052639e0d3cabf1/763fe700b7c58ad64fe5202c5638848244dd4127 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.108/6.18.49/7.1.13/7.2.3/7.3-rc1
Patch: ea09210462316e5235a25eccb11ad0708d86615e/5c86c895d1cac81a71ead3005084c6265cf6a7a5/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d/a9fa05b7a1246797748d15771052639e0d3cabf1/763fe700b7c58ad64fe5202c5638848244dd4127

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80845 (🔒)
GCVE (CVE): GCVE-0-2026-80845
GCVE (VulDB): GCVE-100-398950

Entryinfo

Created: 09/04/2026 18:30
Changes: 09/04/2026 18:30 (59)
Complete: 🔍
Cache ID: 216::103

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