{"id":"CVE-2025-38273","summary":"net: tipc: fix refcount warning in tipc_aead_encrypt","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tipc: fix refcount warning in tipc_aead_encrypt\n\nsyzbot reported a refcount warning [1] caused by calling get_net() on\na network namespace that is being destroyed (refcount=0). This happens\nwhen a TIPC discovery timer fires during network namespace cleanup.\n\nThe recently added get_net() call in commit e279024617134 (\"net/tipc:\nfix slab-use-after-free Read in tipc_aead_encrypt_done\") attempts to\nhold a reference to the network namespace. However, if the namespace\nis already being destroyed, its refcount might be zero, leading to the\nuse-after-free warning.\n\nReplace get_net() with maybe_get_net(), which safely checks if the\nrefcount is non-zero before incrementing it. If the namespace is being\ndestroyed, return -ENODEV early, after releasing the bearer reference.\n\n[1]: https://lore.kernel.org/all/68342b55.a70a0220.253bc2.0091.GAE@google.com/T/#m12019cf9ae77e1954f666914640efa36d52704a2","modified":"2026-04-16T04:36:43.726282133Z","published":"2025-07-10T07:41:54.415Z","related":["SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","openSUSE-SU-2025:20081-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38273.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/307391e8fe70401a6d39ecc9978e13c2c0cdf81f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/445d59025d76d0638b03110f8791d5b89ed5162d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9ff60e0d9974dccf24e89bcd3ee7933e538d929f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/acab7ca5ff19889b80a8ee7dec220ee1a96dede9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c762fc79d710d676b793f9d98b1414efe6eb51e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f29ccaa07cf3d35990f4d25028cc55470d29372b"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38273.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38273"},{"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":"d42ed4de6aba232d946d20653a70f79158a6535b"},{"fixed":"445d59025d76d0638b03110f8791d5b89ed5162d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f5c2c4eaaa5a8e7e0685ec031d480e588e263e59"},{"fixed":"e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b8fcae6d2e93c54cacb8f579a77d827c1c643eb5"},{"fixed":"307391e8fe70401a6d39ecc9978e13c2c0cdf81f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b19fc1d0be3c3397e5968fe2627f22e7f84673b1"},{"fixed":"acab7ca5ff19889b80a8ee7dec220ee1a96dede9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"689a205cd968a1572ab561b0c4c2d50a10e9d3b0"},{"fixed":"c762fc79d710d676b793f9d98b1414efe6eb51e6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e279024617134c94fd3e37470156534d5f2b3472"},{"fixed":"9ff60e0d9974dccf24e89bcd3ee7933e538d929f"},{"fixed":"f29ccaa07cf3d35990f4d25028cc55470d29372b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"4a0fddc2c0d5c28aec8c262ad4603be0bef1938c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38273.json"}}],"schema_version":"1.7.5"}