CVE-2026-31684
medium
CVSS v3
5.5
CVSS v4 NEW
—
VIR risk
5.5
Description
Important: kernel-rt security update
Predictions
Exploit likelihood
55%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API
Description kernel: net: sched: act_csum: validate nested VLAN headers CVSS v3: 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H) Errata / fixed releases ProductPackageAdvisoryReleased Red Hat Enterprise Linux 10kernel-0:6.12.0-211.18.1.el10_2RHSA-2026:215572026-05-28T00:00:00Z Red Hat Enterprise Linux 9kernel-0:5.14.0-687.12.1.el9_8RHSA-2026:215562026-05-28T00:00:00Z Red Hat Enterprise Linux…
Description
kernel: net: sched: act_csum: validate nested VLAN headers
CVSS v3: 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
Errata / fixed releases
| Product | Package | Advisory | Released |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel-0:6.12.0-211.18.1.el10_2 | RHSA-2026:21557 | 2026-05-28T00:00:00Z |
| Red Hat Enterprise Linux 9 | kernel-0:5.14.0-687.12.1.el9_8 | RHSA-2026:21556 | 2026-05-28T00:00:00Z |
| Red Hat Enterprise Linux 9 | kernel-0:5.14.0-687.12.1.el9_8 | RHSA-2026:21556 | 2026-05-28T00:00:00Z |
Package state
| Product | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Not affected |
| Red Hat Enterprise Linux 7 | kernel | Affected |
| Red Hat Enterprise Linux 7 | kernel-rt | Affected |
| Red Hat Enterprise Linux 8 | kernel | Affected |
| Red Hat Enterprise Linux 8 | kernel-rt | Affected |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected |
Apply commands
Apply RHSA-2026:21557 for Red Hat Enterprise Linux 10
yum update -y kernel
# or:
dnf upgrade -y kernelAffected
| Vendor | Product | Version |
|---|---|---|
| redhat | Red Hat Enterprise Linux 6 | Not affected |
| redhat | Red Hat Enterprise Linux 7 | Affected |
| redhat | Red Hat Enterprise Linux 7 | Affected |
| redhat | Red Hat Enterprise Linux 8 | Affected |
| redhat | Red Hat Enterprise Linux 8 | Affected |
| redhat | Red Hat Enterprise Linux 9 | Affected |
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| rhel | 9 | fixed | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 6.19.14-1 |
| debian | sid | fixed | 6.19.14-1 |
| debian | trixie | fixed | 6.12.85-1 |
| linux-kernel | affected | 4.20 | |
| linux-kernel | 7.0 | affected | |
| almalinux | 8 | fixed | kernel-doc-4.18.0-553.126.1.el8_10.noarch.rpm |
References
- https://git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5
- https://git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1b
- https://git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834
- https://git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2
- https://git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62
- https://www.suse.com/security/cve/CVE-2026-31684.html
- https://security-tracker.debian.org/tracker/CVE-2026-31684
- https://access.redhat.com/errata/RHSA-2026:21556
- https://access.redhat.com/errata/RHSA-2026:21706
- https://bugzilla.redhat.com/2404105
- https://bugzilla.redhat.com/2422699
- https://bugzilla.redhat.com/2424879
- https://bugzilla.redhat.com/2429602
- https://bugzilla.redhat.com/2448594
- https://bugzilla.redhat.com/2448745
- https://bugzilla.redhat.com/2454810
- https://bugzilla.redhat.com/2455334
- https://bugzilla.redhat.com/2461107
- https://bugzilla.redhat.com/2461757
- https://bugzilla.redhat.com/2461759
- https://bugzilla.redhat.com/2464369
- https://bugzilla.redhat.com/2464455
- https://bugzilla.redhat.com/2464462
- https://bugzilla.redhat.com/2464476
- https://bugzilla.redhat.com/2467059
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.