{"id":"CVE-2026-80851","summary":"gtp: serialize PDP context updates","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: serialize PDP context updates\n\nPDP contexts can be deleted through GTP_CMD_DELPDP or while the GTP\nnetwork device is being unregistered. The latter is serialized by RTNL,\nbut the generic-netlink delete path only holds RCU.\n\nRunning both paths concurrently can therefore make both paths delete the\nsame PDP context. The issue was found through static analysis and\nreproduced on a KASAN-enabled kernel by a simple two-thread program\nracing GTP_CMD_DELPDP against RTM_DELLINK:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: maybe wild-memory-access in range\n         [0xdead000000000120-0xdead000000000127]\n  RIP: gtp_genl_del_pdp+0x1c1/0x420 [gtp]\n  RBP: dead000000000122\n\nThe second deletion dereferenced the poisoned hlist pprev pointer.\n\nSerialize gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a\nshared mutex. Keep the mutex held until the final use of a PDP context in\nthe NEWPDP path, and keep the RCU read-side section around the complete\nPDP context use in the DELPDP path.","modified":"2026-11-01T02:30:47.237497671Z","published":"2026-09-04T15:55:01.667Z","related":["SUSE-SU-2026:24179-1","SUSE-SU-2026:24184-1","SUSE-SU-2026:24197-1","SUSE-SU-2026:24235-1","openSUSE-SU-2026:11773-1","openSUSE-SU-2026:22091-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80851.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1e995498d29784a06a2b2899370a1926cfc8410d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d950e98f74af9611925a5226edced02155f6ed1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/498386b6d402737db1e2eeed4c385acbf0ef9e34"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5f77ddb2756340c1b05381674ca025d52998005e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6df4f05bc2991467939d7d80b6f7e121559cc3df"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e5472c1c1619793cbadb02bccf7d2d9f826052f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d8ebf8875fb97b3e39aa226af78f9c619e96ee31"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9a83492ffc99f228d91873473e3820300525f00"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80851.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80851"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"459aa660eb1d8ce67080da1983bb81d716aa5a69"},{"fixed":"d8ebf8875fb97b3e39aa226af78f9c619e96ee31"},{"fixed":"6e5472c1c1619793cbadb02bccf7d2d9f826052f"},{"fixed":"d9a83492ffc99f228d91873473e3820300525f00"},{"fixed":"b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a"},{"fixed":"5f77ddb2756340c1b05381674ca025d52998005e"},{"fixed":"3d950e98f74af9611925a5226edced02155f6ed1"},{"fixed":"6df4f05bc2991467939d7d80b6f7e121559cc3df"},{"fixed":"1e995498d29784a06a2b2899370a1926cfc8410d"},{"fixed":"498386b6d402737db1e2eeed4c385acbf0ef9e34"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80851.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.7.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.108"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.49"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.13"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80851.json"}}],"schema_version":"1.9.2"}