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CVE-2026-72393

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: don't cache shinfo across skb realloc fbnic_tx_lso() calls skb_cow_head() which may reallocate the skb including th…

Published Aug 15, 2026EPSS 0.63%

Overview

CVE-2026-72393 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

eth: fbnic: don't cache shinfo across skb realloc

fbnic_tx_lso() calls skb_cow_head() which may reallocate the skb

including the shared info. We can't use the pointer calculated

before the call.

BUG: KASAN: slab-use-after-free in fbnic_tx_lso.isra.0+0x668/0x8e0

Read of size 4 at addr ff110000262edd98 by task swapper/5/0

Call Trace:

fbnic_tx_lso.isra.0+0x668/0x8e0

fbnic_xmit_frame+0x622/0xba0

dev_hard_start_xmit+0xf4/0x620

Allocated by task 8653:

__alloc_skb+0x11e/0x5f0

alloc_skb_with_frags+0xcc/0x6c0

sock_alloc_send_pskb+0x327/0x3f0

__ip_append_data+0x188b/0x47a0

ip_make_skb+0x24a/0x300

udp_sendmsg+0x14d2/0x21e0

Freed by task 0:

kfree+0x123/0x5a0

pskb_expand_head+0x36c/0xfa0

fbnic_tx_lso.isra.0+0x500/0x8e0

fbnic_xmit_frame+0x622/0xba0

dev_hard_start_xmit+0xf4/0x620

sch_direct_xmit+0x25b/0x1100

The buggy address belo

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/21f304c2aae46625e050c28d979f4b9d83faa85eRefgit.kernel.org/stable/c/62b68b774f06bf52e329f254f0199bc43d350ccfRefgit.kernel.org/stable/c/83df3e2594cd78aa40b1246a19879abb4891945b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72393?

CVE-2026-72393 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-72393?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72393?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72393?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72393 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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