{"id":"CVE-2026-80851","state":"PUBLISHED","title":"gtp: serialize PDP context updates","description":"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.","publishedAt":"2026-09-04T15:55:01.667Z","updatedAt":"2026-10-30T12:31:13.973Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"d8ebf8875fb97b3e39aa226af78f9c619e96ee31","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"6e5472c1c1619793cbadb02bccf7d2d9f826052f","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"d9a83492ffc99f228d91873473e3820300525f00","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"5f77ddb2756340c1b05381674ca025d52998005e","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"3d950e98f74af9611925a5226edced02155f6ed1","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"6df4f05bc2991467939d7d80b6f7e121559cc3df","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"1e995498d29784a06a2b2899370a1926cfc8410d","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"498386b6d402737db1e2eeed4c385acbf0ef9e34","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/gtp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/gtp.c"]}],"references":["https://git.kernel.org/stable/c/d8ebf8875fb97b3e39aa226af78f9c619e96ee31","https://git.kernel.org/stable/c/6e5472c1c1619793cbadb02bccf7d2d9f826052f","https://git.kernel.org/stable/c/d9a83492ffc99f228d91873473e3820300525f00","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"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80851.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80851","state":"PUBLISHED","datePublished":"2026-09-04T15:55:01.667Z","dateUpdated":"2026-10-30T12:31:13.973Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.797Z"},"containers":{"cna":{"title":"gtp: serialize PDP context updates","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"d8ebf8875fb97b3e39aa226af78f9c619e96ee31","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"6e5472c1c1619793cbadb02bccf7d2d9f826052f","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"d9a83492ffc99f228d91873473e3820300525f00","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"5f77ddb2756340c1b05381674ca025d52998005e","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"3d950e98f74af9611925a5226edced02155f6ed1","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"6df4f05bc2991467939d7d80b6f7e121559cc3df","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"1e995498d29784a06a2b2899370a1926cfc8410d","versionType":"git"},{"version":"459aa660eb1d8ce67080da1983bb81d716aa5a69","status":"affected","lessThan":"498386b6d402737db1e2eeed4c385acbf0ef9e34","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/gtp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/gtp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d8ebf8875fb97b3e39aa226af78f9c619e96ee31"},{"url":"https://git.kernel.org/stable/c/6e5472c1c1619793cbadb02bccf7d2d9f826052f"},{"url":"https://git.kernel.org/stable/c/d9a83492ffc99f228d91873473e3820300525f00"},{"url":"https://git.kernel.org/stable/c/b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a"},{"url":"https://git.kernel.org/stable/c/5f77ddb2756340c1b05381674ca025d52998005e"},{"url":"https://git.kernel.org/stable/c/3d950e98f74af9611925a5226edced02155f6ed1"},{"url":"https://git.kernel.org/stable/c/6df4f05bc2991467939d7d80b6f7e121559cc3df"},{"url":"https://git.kernel.org/stable/c/1e995498d29784a06a2b2899370a1926cfc8410d"},{"url":"https://git.kernel.org/stable/c/498386b6d402737db1e2eeed4c385acbf0ef9e34"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:31:13.973Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.108"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.49"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.1.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}