Use After Free Affecting python3-perf package, versions <0:5.14.0-687.56.1.el9_8


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.51% (42nd percentile)

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  • Snyk IDSNYK-ORACLE9-PYTHON3PERF-20883665
  • published13 Oct 2026
  • disclosed19 Jul 2026

Introduced: 19 Jul 2026

CVE-2026-63993  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Oracle:9 python3-perf to version 0:5.14.0-687.56.1.el9_8 or higher.
This issue was patched in ELSA-2026-76739.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-perf package and not the python3-perf package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

skb_tunnel_check_pmtu() can change skb->head.

Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF.

Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c.

Found by Sashiko.

CVSS Base Scores

version 3.1