CVE-2025-21756
high
CVSS v3
7.8
CVSS v4 NEW
—
VIR risk
7.8
Description
RHSA-2025:8345: kpatch-patch-4_18_0-553, kpatch-patch-4_18_0-553_16_1, kpatch-patch-4_18_0-553_30_1, and kpatch-patch-4_18_0-553_40_1 security update (Important)
Predictions
Exploit likelihood
75%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| rocky | 8 | fixed | |
| sles | affected | | |
| debian | bookworm | fixed | 6.1.133-1 |
| debian | bullseye | fixed | 5.10.237-1 |
| debian | forky | fixed | 6.12.16-1 |
| debian | sid | fixed | 6.12.16-1 |
| debian | trixie | fixed | 6.12.16-1 |
| linux-kernel | affected | 5.10.235 | |
| almalinux | 9 | fixed | kernel-headers-5.14.0-570.17.1.el9_6.aarch64.rpm |
| rhel | 8 | fixed | |
References
- https://access.redhat.com/errata/RHSA-2025:7903
- https://git.kernel.org/stable/c/3f43540166128951cc1be7ab1ce6b7f05c670d8b
- https://git.kernel.org/stable/c/42b33381e5e1f2b967dc4fb4221ddb9aaf10d197
- https://git.kernel.org/stable/c/645ce25aa0e67895b11d89f27bb86c9d444c40f8
- https://git.kernel.org/stable/c/b1afd40321f1c243cffbcf40ea7ca41aca87fa5e
- https://git.kernel.org/stable/c/e48fcb403c2d0e574c19683f09399ab4cf67809c
- https://git.kernel.org/stable/c/e7754d564579a5db9c5c9f74228df5d6dd6f1173
- https://git.kernel.org/stable/c/fcdd2242c0231032fc84e1404315c245ae56322a
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://errata.rockylinux.org/RLSA-2025:8057
- https://errata.rockylinux.org/RLSA-2025:8056
- https://www.suse.com/security/cve/CVE-2025-21756.html
- https://security-tracker.debian.org/tracker/CVE-2025-21756
- https://bugzilla.redhat.com/2348609
- https://bugzilla.redhat.com/2356605
- https://bugzilla.redhat.com/2363332
- https://errata.almalinux.org/9/ALSA-2025-7903.html
- https://access.redhat.com/errata/RHSA-2025:8056
- https://bugzilla.redhat.com/2297490
- https://bugzilla.redhat.com/2309801
- https://errata.almalinux.org/8/ALSA-2025-8056.html
- https://access.redhat.com/errata/RHSA-2025:8057
CWEs
CWE-416
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.