CVSS 5.5 · Medium EPSS 0,18%
Kerentanan Improper Locking pada linux kernel, debian linux. Skor CVSS 3.1 5.5 (Medium) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Prevent lock inversion deadlock in map delete elem syzkaller started using corpuses where a BPF tracing program deletes elements from a sockmap/sockhash map. Because BPF tracing programs can be invoked from any interrupt context, locks taken during a map_delete_elem operation must be hardirq-safe. Otherwise a deadlock due to lock inversion is possible, as reported by lockdep: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&host->lock); lock(&htab->buckets[i].lock); <Interrupt> lock(&host->lock); Locks in sockmap are hardirq-unsafe by design. We expects elements to be deleted from sockmap/sockhash only in task (normal) context with interrupts enabled, or in softirq context. Detect when map_delete_elem operation is invoked from a context which is _not_ hardirq-unsafe, that is interrupts are disabled, and bail out with an error. Note that map updates are not affected by this issue. BPF verifier does not allow updating sockmap/sockhash from a BPF tracing program today.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 4.20 hingga sebelum 5.4.274 |
| linux | linux kernel | Versi 5.5 hingga sebelum 5.10.215 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.154 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.85 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.26 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.8.5 |
| linux | linux kernel | Versi 6.9 rc1 |
| linux | linux kernel | Versi 6.9 rc2 |
| debian | debian linux | Versi 10.0 |