VulnerabilityPublished 4 Sep 2026Updated 3 Oct 2026

CVE-2026-80851: Linux kernel · gtp: serialize PDP context updates

Affects Linux kernelSource GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-wq34-548c-54v3

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected 6.17.0-5.5 – 7.0.0-34.34 22 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1013.13 14 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1014.14 14 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1013.13 8 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1013.13 12 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected 7.0.0-1002.3 – 7.0.0-1007.8 5 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available that serializes PDP context add and delete operations with a shared mutex to prevent concurrent deletions. Users should apply the updated Linux kernel versions containing this fix. No additional mitigation is indicated or required per the vendor advisory.

Description

A concurrency vulnerability in the Linux kernel's GTP (GPRS Tunneling Protocol) implementation allows simultaneous deletion of the same PDP context via different code paths, leading to potential use-after-free and memory corruption. This issue arises because the generic-netlink delete path only holds RCU protection, while the network device unregistration path is serialized by RTNL, allowing races. The flaw was confirmed by static analysis and reproduced on a KASAN-enabled kernel, causing general protection faults and wild memory accesses. The fix involves serializing PDP context add and delete operations with a shared mutex to prevent concurrent deletions.

Impact

This vulnerability can cause kernel crashes (general protection faults) and memory corruption due to concurrent deletion of PDP contexts in the GTP kernel module. Such faults can lead to denial of service or system instability. There is no indication of remote code execution or privilege escalation from the provided data.

Summary

The Linux kernel's GTP module had a race condition where PDP contexts could be deleted concurrently through GTP_CMD_DELPDP or during GTP network device unregistration. The unregistration path is serialized by RTNL, but the generic-netlink delete path only uses RCU, allowing both paths to delete the same PDP context simultaneously. This leads to dereferencing poisoned pointers and kernel faults. The vulnerability was identified via static analysis and confirmed with a KASAN test reproducing general protection faults and wild memory access. The resolution serializes gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() operations with a shared mutex, held until the PDP context is fully used or deleted.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 04:11 UTC

Technical details

References

Community reviews

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