{"id":"CVE-2026-98378","summary":"bpf: Skip unsettled links in link iterator","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Skip unsettled links in link iterator\n\nbpf_link_prime() inserts a link into link_idr before anon_inode_getfile()\nsucceeds and before bpf_link_settle() publishes the ID in link-\u003eid.\nbpf_link_by_id() treats such an ID-zero link as unsettled, but the link\niterator takes a reference without this check.\n\nIf anon_inode_getfile() then fails, the creator removes the ID and frees\nits still-private link directly.  The iterator is left with a dangling\nreference and its next bpf_link_put() accesses freed memory.\n\nTreat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as\nbpf_link_by_id() does.\n\n  BUG: KASAN: slab-use-after-free in bpf_link_put\n  Write of size 8 by task exp/384\n  Call Trace:\n  bpf_link_put                    kernel/bpf/syscall.c:3372\n  bpf_link_seq_next               kernel/bpf/link_iter.c:33\n  bpf_seq_read                    kernel/bpf/bpf_iter.c:158\n  vfs_read                        fs/read_write.c:572\n  ksys_read                       fs/read_write.c:716\n  do_syscall_64                   arch/x86/entry/syscall_64.c:84\n  entry_SYSCALL_64_after_hwframe  arch/x86/entry/entry_64.S:121\n  Kernel panic - not syncing: KASAN: panic_on_warn set ...","modified":"2026-10-11T02:47:29.324134428Z","published":"2026-10-09T07:34:18.626Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98378.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434"},{"type":"WEB","url":"https://git.kernel.org/stable/c/68930f8d40ab4c10ca3b019f076136758fd100a8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e271f093d15d323f42de26f66556af53fa8e19f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87ce4b53b7436b50fc984f0a6afaf77f68ac5573"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c251ed48bd9063cf7de6049421e78b6de989060f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98378.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98378"},{"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":"9f88361273082825d9f0d13a543d49f9fa0d44a8"},{"fixed":"68930f8d40ab4c10ca3b019f076136758fd100a8"},{"fixed":"c251ed48bd9063cf7de6049421e78b6de989060f"},{"fixed":"798a61edbc436cacdb659927d067368eeb1e30e2"},{"fixed":"6e271f093d15d323f42de26f66556af53fa8e19f"},{"fixed":"87ce4b53b7436b50fc984f0a6afaf77f68ac5573"},{"fixed":"50e80e2bb5e2be8515205b9c496b9640ddefa434"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98378.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.19.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98378.json"}}],"schema_version":"1.9.0"}