VulnerabilityPublished 4 Sep 2026Updated 30 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d9a83492ffc99f228d91873473e3820300525f00 : patch Linux kernel soon.

Data as of 30 Oct 2026, 13:18 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in d9a83492ffc99f228d91873473e3820300525f00, d8ebf8875fb97b3e39aa226af78f9c619e96ee31, b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a +6

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 459aa660eb1d8ce67080da1983bb81d716aa5a69, < d9a83492ffc99f228d91873473e3820300525f00	Fixed in d9a83492ffc99f228d91873473e3820300525f00
LinuxLinux	Affected ≥ 459aa660eb1d8ce67080da1983bb81d716aa5a69, < d8ebf8875fb97b3e39aa226af78f9c619e96ee31	Fixed in d8ebf8875fb97b3e39aa226af78f9c619e96ee31
LinuxLinux	Affected ≥ 459aa660eb1d8ce67080da1983bb81d716aa5a69, < b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a	Fixed in b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a
LinuxLinux	Affected ≥ 459aa660eb1d8ce67080da1983bb81d716aa5a69, < 498386b6d402737db1e2eeed4c385acbf0ef9e34	Fixed in 498386b6d402737db1e2eeed4c385acbf0ef9e34
LinuxLinux	Affected ≥ 459aa660eb1d8ce67080da1983bb81d716aa5a69, < 6e5472c1c1619793cbadb02bccf7d2d9f826052f	Fixed in 6e5472c1c1619793cbadb02bccf7d2d9f826052f
LinuxLinux	Affected ≥ 459aa660eb1d8ce67080da1983bb81d716aa5a69, < 6df4f05bc2991467939d7d80b6f7e121559cc3df	Fixed in 6df4f05bc2991467939d7d80b6f7e121559cc3df

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by the provided hashes. Users should update to a kernel version that includes these fixes. No additional mitigation steps are indicated by the vendor advisory.

Description

A concurrency vulnerability in the Linux kernel's GTP module allows simultaneous deletion of the same PDP context through different code paths, leading to potential kernel crashes due to use-after-free conditions. The issue arises because the generic-netlink delete path only holds RCU protection, while the other path is serialized by RTNL, allowing race conditions. The flaw was confirmed by static analysis and reproduced on a KASAN-enabled kernel.

Impact

Exploitation of this vulnerability can cause kernel crashes due to use-after-free conditions when the same PDP context is deleted concurrently. This can lead to system instability or denial of service. There is no indication of privilege escalation or remote code execution from the provided data.

Summary

CVE-2026-80851 is a concurrency flaw in the Linux kernel's GTP implementation where PDP contexts can be deleted concurrently via GTP_CMD_DELPDP and the network device unregistration path. The unregistration path is serialized by RTNL, but the generic-netlink delete path only uses RCU, permitting both paths to delete the same PDP context simultaneously. This race condition leads to dereferencing a poisoned pointer and kernel crashes (general protection faults). The fix involves serializing the add, delete, and device unlink operations with a shared mutex and extending mutex and RCU protections to cover the entire PDP context lifecycle.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Oct 2026, 13:18 UTC

Technical details

References

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