gtp: serialize PDP context updates

Answer in brief

CVE-2026-80851 records a Unknown severity vulnerability in gtp: serialize PDP context updates. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 4, 2026Updated Sep 4, 2026Source checked Sep 4, 2026First seen by HOL Sep 4, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=459aa660eb1d8ce67080da1983bb81d716aa5a69 <5f77ddb2756340c1b05381674ca025d52998005e \|\| >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <3d950e98f74af9611925a5226edced02155f6ed1 \|\| >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <6df4f05bc2991467939d7d80b6f7e121559cc3df \|\| >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <1e995498d29784a06a2b2899370a1926cfc8410d \|\| >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <498386b6d402737db1e2eeed4c385acbf0ef9e34	5f77ddb2756340c1b05381674ca025d52998005e, 3d950e98f74af9611925a5226edced02155f6ed1, 6df4f05bc2991467939d7d80b6f7e121559cc3df, 1e995498d29784a06a2b2899370a1926cfc8410d, 498386b6d402737db1e2eeed4c385acbf0ef9e34
Linux/Linuxgeneric	4.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 5f77ddb2756340c1b05381674ca025d52998005e if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 4, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: gtp: serialize PDP context updates PDP contexts can be deleted through GTP_CMD_DELPDP or while the GTP network device is being unregistered. The latter is serialized by RTNL, but the generic-netlink delete path only holds RCU. Running both paths concurrently can therefore make both paths delete the same PDP context. The issue was found through static analysis and reproduced on a KASAN-enabled kernel by a simple two-thread program racing GTP_CMD_DELPDP against RTM_DELLINK: Oops: general protection fault, probably for non-canonical address KASAN: maybe wild-memory-access in range [0xdead000000000120-0xdead000000000127] RIP: gtp_genl_del_pdp+0x1c1/0x420 [gtp] RBP: dead000000000122 The second deletion dereferenced the poisoned hlist pprev pointer. Serialize gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a shared mutex. Keep the mutex held until the final use of a PDP context in the NEWPDP path, and keep the RCU read-side section around the complete PDP context use in the DELPDP path.

Quoted source text, attributed separately from HOL analysis.