CVE-2026-43036: In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 G

Q: How do I fix CVE-2026-43036?

linux kernel: upgrade to 6.12.81, 6.18.22, 6.19.12. Exact commands for each OS are on this page.

Q: Is CVE-2026-43036 being exploited?

CVE-2026-43036 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-43036 affect?

CVE-2026-43036 affects linux kernel. Severity is medium (CVSS 5.5). In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1]. gso

Q: How urgent is CVE-2026-43036?

Priority 25/100. On your watchlist

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2026-43036 is a medium-severity flaw (CVSS 5.5) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1]. gso_features_check() reads iph->frag_off to decide whether to clear mangleid_features. Accessing the IPv4 header via ip_hdr()/inner_ip_hdr() can rely on skb header offsets that are not always safe for direct deref

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-908
Published	2026-05-01
Last modified	2026-10-21

Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-10-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-01 15:16 UTCPublished CVE record published
2026-10-21 13:18 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 4.7 and < 6.12.81 · >= 6.13 and < 6.18.22 · >= 6.19 and < 6.19.12 · 7.0 rc1 · 7.0 rc2 · 7.0 rc3 · 7.0 rc4 · 7.0 rc5

Fixed in: 6.12.81, 6.18.22, 6.19.12

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43036?

linux kernel: upgrade to 6.12.81, 6.18.22, 6.19.12. Exact commands for each OS are on this page.

Is CVE-2026-43036 being exploited?

CVE-2026-43036 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43036 affect?

CVE-2026-43036 affects linux kernel. Severity is medium (CVSS 5.5). In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1]. gso

How urgent is CVE-2026-43036?

Priority 25/100. On your watchlist

Software pages

Linux kernel vulnerabilities

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References

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