CVE-2026-31663: xfrm: hold dev ref until after transport_finish NF_HOOK
Vendor fix available · Affected: Linux · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 13% of scored CVEs
DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved: xfrm: hold dev ref until after transport_finish NF_HOOK After async crypto completes, xfrm_input_resume() calls dev_put() immediately on re-entry before the skb reaches transport_finish. The skb->dev pointer is then used inside NF_HOOK and its okfn, which can race with device teardown. Remove the dev_put from the async resumption entry and instead drop the reference after the NF_HOOK call in transport_finish, using a saved device pointer since NF_HOOK may consume the skb. This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip the okfn. For non-transport exits (decaps, gro, drop) and secondary async return points, release the reference inline when async is set.
Affected products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Linux · Linuxfrom 3.2.100 before 3.3; from 3.16.55 before 3.17; from 4.14.24 before 4.15
- Linux · Linux4.15
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Linux
- Published
- April 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-31663 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-826cwe.mitre.org
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- git.kernel.org/stable/c/4d06caedea587c59cc2cc893ceecc57c75c64312git.kernel.org
- git.kernel.org/stable/c/94439cbe478b53f92223da9aae95fffb28623c3fgit.kernel.org
- git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9egit.kernel.org
- git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031bgit.kernel.org
- git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2git.kernel.org
- git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcbgit.kernel.org
- access.redhat.com/security/cve/CVE-2026-31663access.redhat.com
- Issue trackerbugzilla.redhat.com
1 more reference is in the CVE record.