Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-40909

bpf: Fix a potential use-after-free in bpf_link_free()

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 876941f533e7b47fc69977fc4551c02f2d18af97 to < 91cff53136daeff50816b0baeafd38a6976f6209affected
  • 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce to < fa97b8fed9896f1e89cb657513e483a152d4c382affected
  • 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce to < 2884dc7d08d98a89d8d65121524bb7533183a63aaffected
  • 5d8d447777564b35f67000e7838e7ccb64d525c8affected
  • 6.6.26 to < 6.6.35affected
  • 6.8.5 to < 6.9affected

Linux Linux

Default version status: affected

  • 6.9affected
  • 0 to < 6.9unaffected
  • 6.6.35 to ≤ 6.6.*unaffected
  • 6.9.6 to ≤ 6.9.*unaffected
  • 6.10 to ≤ *unaffected

References