CVE-2026-98378bpf: Skip unsettled links in link iterator
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In the Linux kernel, the following vulnerability has been resolved: bpf: Skip unsettled links in link iterator bpf_link_prime() inserts a link into link_idr before anon_inode_getfile() succeeds and before bpf_link_settle() publishes the ID in link->id. bpf_link_by_id() treats such an ID-zero link as unsettled, but the link iterator takes a reference without this check. If anon_inode_getfile() then fails, the creator removes the ID and frees its still-private link directly. The iterator is left with a dangling reference and its next bpf_link_put() accesses freed memory. Treat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as bpf_link_by_id() does. BUG: KASAN: slab-use-after-free in bpf_link_put Write of size 8 by task exp/384 Call Trace: bpf_link_put kernel/bpf/syscall.c:3372 bpf_link_seq_next kernel/bpf/link_iter.c:33 bpf_seq_read kernel/bpf/bpf_iter.c:158 vfs_read fs/read_write.c:572 ksys_read fs/read_write.c:716 do_syscall_64 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:121 Kernel panic - not syncing: KASAN: panic_on_warn set ...
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 9f88361273082825d9f0d13a543d49f9fa0d44a8 before 68930f8d40ab4c10ca3b019f076136758fd100a8; from 9f88361273082825d9f0d13a543d49f9fa0d44a8 before c251ed48bd9063cf7de6049421e78b6de989060f; from 9f88361273082825d9f0d13a543d49f9fa0d44a8 before 798a61edbc436cacdb659927d067368eeb1e30e2; 9f88361273082825d9f0d13a543d49f9fa0d44a8 builds before 6e271f093d15d323f42de26f66556af53fa8e19f; from 9f88361273082825d9f0d13a543d49f9fa0d44a8 before 87ce4b53b7436b50fc984f0a6afaf77f68ac5573; from 9f88361273082825d9f0d13a543d49f9fa0d44a8 before 50e80e2bb5e2be8515205b9c496b9640ddefa434 | CNA record |
References
- https://git.kernel.org/stable/c/68930f8d40ab4c10ca3b019f076136758fd100a8
- https://git.kernel.org/stable/c/c251ed48bd9063cf7de6049421e78b6de989060f
- https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2
- https://git.kernel.org/stable/c/6e271f093d15d323f42de26f66556af53fa8e19f
- https://git.kernel.org/stable/c/87ce4b53b7436b50fc984f0a6afaf77f68ac5573
- https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.