SECUFOCUSNOW
Home›CVE index›CVE-2026-63919
Review reviewHigh

CVE-2026-63919

Linux

In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one...

Affected product and versions

Product
Linux
Affected versions
>= 7b3801927e52f8621de311277f7fc727635019e7 < 7ee59eda8820b758ed29e1cd3222359c7b97302c, >= 7b3801927e52f8621de311277f7fc727635019e7 < 2df7059a18afb7d3aee6c36cad5d371c198111d4, >= 7b3801927e52f8621de311277f7fc727635019e7 < 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa, >= 7b3801927e52f8621de311277f7fc727635019e7 < 48ce101cd630d6745b6923b5bad8358bc4c119da, >= 7b3801927e52f8621de311277f7fc727635019e7 < 55ddfc41451f01c588089cd74957a05311b6f202, >= 7b3801927e52f8621de311277f7fc727635019e7 < 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e, >= 7b3801927e52f8621de311277f7fc727635019e7 < 9f67a36e91bb50d358760f381f233913fe5c09f8, >= 7b3801927e52f8621de311277f7fc727635019e7 < c16f74dc1d75d0e2e7670076d5375deda110ebeb, >= 5.6
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-63919 — Linux | SECUFOCUS NOW