{"id":"CVE-2026-23297","summary":"nfsd: Fix cred ref leak in nfsd_nl_threads_set_doit().","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Fix cred ref leak in nfsd_nl_threads_set_doit().\n\nsyzbot reported memory leak of struct cred. [0]\n\nnfsd_nl_threads_set_doit() passes get_current_cred() to\nnfsd_svc(), but put_cred() is not called after that.\n\nThe cred is finally passed down to _svc_xprt_create(),\nwhich calls get_cred() with the cred for struct svc_xprt.\n\nThe ownership of the refcount by get_current_cred() is not\ntransferred to anywhere and is just leaked.\n\nnfsd_svc() is also called from write_threads(), but it does\nnot bump file-\u003ef_cred there.\n\nnfsd_nl_threads_set_doit() is called from sendmsg() and\ncurrent-\u003ecred does not go away.\n\nLet's use current_cred() in nfsd_nl_threads_set_doit().\n\n[0]:\nBUG: memory leak\nunreferenced object 0xffff888108b89480 (size 184):\n  comm \"syz-executor\", pid 5994, jiffies 4294943386\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc 369454a7):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4958 [inline]\n    slab_alloc_node mm/slub.c:5263 [inline]\n    kmem_cache_alloc_noprof+0x412/0x580 mm/slub.c:5270\n    prepare_creds+0x22/0x600 kernel/cred.c:185\n    copy_creds+0x44/0x290 kernel/cred.c:286\n    copy_process+0x7a7/0x2870 kernel/fork.c:2086\n    kernel_clone+0xac/0x6e0 kernel/fork.c:2651\n    __do_sys_clone+0x7f/0xb0 kernel/fork.c:2792\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f","modified":"2026-04-23T18:29:25.786551074Z","published":"2026-03-25T10:26:54.156Z","related":["SUSE-SU-2026:21237-1","openSUSE-SU-2026:20572-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23297.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1cb968a2013ffa8112d52ebe605009ea1c6a582c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/27c13c5bb0948e3b5c64e59f8a903231896fab9b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41170716421c25cd20b39e83f0e0762e212b377b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3f88e3e18b51a7f654189189c762ebcdeaa7e29"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23297.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23297"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"924f4fb003ba114c60b3c07a011dcd86a8956cd1"},{"fixed":"41170716421c25cd20b39e83f0e0762e212b377b"},{"fixed":"27c13c5bb0948e3b5c64e59f8a903231896fab9b"},{"fixed":"a3f88e3e18b51a7f654189189c762ebcdeaa7e29"},{"fixed":"1cb968a2013ffa8112d52ebe605009ea1c6a582c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23297.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"6.12.77"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.17"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23297.json"}}],"schema_version":"1.7.5"}