CVE-2026-80851gtp: serialize PDP context updates
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 459aa660eb1d8ce67080da1983bb81d716aa5a69 before b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a; 459aa660eb1d8ce67080da1983bb81d716aa5a69 builds before 5f77ddb2756340c1b05381674ca025d52998005e; 459aa660eb1d8ce67080da1983bb81d716aa5a69 builds before 3d950e98f74af9611925a5226edced02155f6ed1; 459aa660eb1d8ce67080da1983bb81d716aa5a69 builds before 6df4f05bc2991467939d7d80b6f7e121559cc3df; 459aa660eb1d8ce67080da1983bb81d716aa5a69 builds before 1e995498d29784a06a2b2899370a1926cfc8410d; from 459aa660eb1d8ce67080da1983bb81d716aa5a69 before 498386b6d402737db1e2eeed4c385acbf0ef9e34 | CNA record |
References
- https://git.kernel.org/stable/c/b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a
- https://git.kernel.org/stable/c/5f77ddb2756340c1b05381674ca025d52998005e
- https://git.kernel.org/stable/c/3d950e98f74af9611925a5226edced02155f6ed1
- https://git.kernel.org/stable/c/6df4f05bc2991467939d7d80b6f7e121559cc3df
- https://git.kernel.org/stable/c/1e995498d29784a06a2b2899370a1926cfc8410d
- https://git.kernel.org/stable/c/498386b6d402737db1e2eeed4c385acbf0ef9e34
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.