CVE-2026-53227

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.

Score

CVSS 3.1 5.5 Medium

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-06-25

Last modified

2026-10-15

Weaknesses

CWE-401

Affected products

• Linux Kernel (Linux)
• Simatic S7-1500 Tm Mfp - Gnulinux Subsystem (Siemens)

References

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