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CVE-2026-98374: In the Linux kernel, the following vulnerability has been resolved: tcp: fix use-after-free of retransmit_skb

37
Routine
HIGH 8.8WATCHLIST

CVE-2026-98374 is a high-severity flaw (CVSS 8.8) affecting affected software. 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: tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack() When tcp_send_synack() replaces the cloned SYN skb at the head of the retransmit queue with a copy, it frees the original with tcp_rtx_queue_unlink_and_free() and only repairs tp->highest_sack. tp->retransmit_skb_hint keeps pointing at the freed skbuff_fclone_cache object. The dangling hint is read in tcp_veri

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance0.2% (top 95%)
CISA exploited listNo
Published2026-10-07
Last modified2026-10-24
Publisher (CNA): kernel.org

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

Exact fixes by distribution

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source
sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0
Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source
sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310
Ubuntu 20.04 · linux · NOT AFFECTED
Ubuntu 22.04 · linux · NO FIX YET
Ubuntu 24.04 · linux · NO FIX YET
Ubuntu 20.04 · linux-hwe-5.15 · NO FIX YET
Ubuntu 22.04 · linux-hwe-6.8 · NO FIX YET
Debian 12 · linux · FIXED · 6.1.190-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.190-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · linux · FIXED · 6.12.113-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.113-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · linux-6.12 · FIXED · 6.12.113-1~deb12u1
sudo apt update && sudo apt install --only-upgrade linux-6.12 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-6.12)" ge "6.12.113-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · kernel · NO FIX YET
RHEL 6 · kernel · DEFERRED
RHEL 7 · kernel · NOT AFFECTED
RHEL 7 · kernel-rt · NOT AFFECTED
RHEL 8 · kernel · NOT AFFECTED
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-2026-98374?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-98374 being exploited?

CVE-2026-98374 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-2026-98374 affect?

CVE-2026-98374 affects affected software. Severity is high (CVSS 8.8). In the Linux kernel, the following vulnerability has been resolved: tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack() When tcp_send_synack() replaces the cloned SYN skb at the head of the retransmit queue with a copy, it

How urgent is CVE-2026-98374?

Priority 37/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

References

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