CVE-2024-35895bpf, sockmap: Prevent lock inversion deadlock in map delete elem

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.18% · top 92% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

• Linux · Linux

  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < f7990498b05ac41f7d6a190dc0418ef1d21bf058
  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < dd54b48db0c822ae7b520bc80751f0a0a173ef75
  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec
  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < a44770fed86515eedb5a7c00b787f847ebb134a5
  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < 668b3074aa14829e2ac2759799537a93b60fef86
  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < 6af057ccdd8e7619960aca1f0428339f213b31cd
  • affected 604326b41a6fb9b4a78b6179335decee0365cd8c – < ff91059932401894e6c86341915615c5eb0eca48

• Linux · Linux

  • affected 4.20
  • unaffected < 4.20
  • unaffected 5.4.274 – ≤ 5.4.*
  • unaffected 5.10.215 – ≤ 5.10.*
  • unaffected 5.15.154 – ≤ 5.15.*
  • unaffected 6.1.85 – ≤ 6.1.*
  • unaffected 6.6.26 – ≤ 6.6.*
  • unaffected 6.8.5 – ≤ 6.8.*
  • unaffected 6.9 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2024-35613 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-35895](https://cveledger.app/badge/CVE-2024-35895.svg)](https://cveledger.app/cve/CVE-2024-35895)

Record last updated 15 Oct 2026, 00:41 UTC.