Medium 5.5Published Jun 25, 2026

CVE-2026-53227net: openvswitch: fix possible kfree_skb of ERR_PTR

Updated under an hour ago (Oct 26, 2026, 5:10 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfree_skb of ERR_PTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex. However, error cleanups still follow the classical reversed order, assuming "reply" is allocated before locking: it is freed after unlocking. If "reply" allocation happens after locking the mutex and it fails, "reply" is left with an ERR_PTR, and execution jumps to the correspondent cleanup stage which will try to free an invalid pointer. Fix this by setting the pointer to NULL after having saved its error value.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 893f139b9a6c00c097b9082a90f3041cfb3a0d20 before e248fb2e680deb2bd37bac551b72638fe4938a76; 893f139b9a6c00c097b9082a90f3041cfb3a0d20 builds before 0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d; from 893f139b9a6c00c097b9082a90f3041cfb3a0d20 before 971b1b37774f13acc5add0a2843f8598446b8598; 893f139b9a6c00c097b9082a90f3041cfb3a0d20 builds before 25fdf53698535fe8790237f5a8a9626791429785; from 893f139b9a6c00c097b9082a90f3041cfb3a0d20 before e3d509a1b71396e1452060dbf84a805fd1c3c549; from 893f139b9a6c00c097b9082a90f3041cfb3a0d20 before ecc55aad3390129a87106841f4b68bf3d70c9264; from 893f139b9a6c00c097b9082a90f3041cfb3a0d20 before 895d1dd9057cde1687fa0f4286d47ceed0b82997; from 893f139b9a6c00c097b9082a90f3041cfb3a0d20 before ee30dd2909d8b98619f4341c70ec8dc8e155ab02	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.16 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 6 more ranges	NVD

References

References

https://git.kernel.org/stable/c/e248fb2e680deb2bd37bac551b72638fe4938a76	patch
https://git.kernel.org/stable/c/0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d	patch
https://git.kernel.org/stable/c/971b1b37774f13acc5add0a2843f8598446b8598	patch
https://git.kernel.org/stable/c/25fdf53698535fe8790237f5a8a9626791429785	patch
https://git.kernel.org/stable/c/e3d509a1b71396e1452060dbf84a805fd1c3c549	patch
https://git.kernel.org/stable/c/ecc55aad3390129a87106841f4b68bf3d70c9264	patch
https://git.kernel.org/stable/c/895d1dd9057cde1687fa0f4286d47ceed0b82997	patch
https://git.kernel.org/stable/c/ee30dd2909d8b98619f4341c70ec8dc8e155ab02	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.