Riskcovery

CVE-2024-56675

bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors

State
Published
Severity
7.8 High
Published
Dec 27, 2024
Updated
May 11, 2026
Reserved
Dec 27, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors

Uprobes always use bpf_prog_run_array_uprobe() under tasks-trace-RCU protection. But it is possible to attach a non-sleepable BPF program to a uprobe, and non-sleepable BPF programs are freed via normal RCU (see __bpf_prog_put_noref()). This leads to UAF of the bpf_prog because a normal RCU grace period does not imply a tasks-trace-RCU grace period.

Fix it by explicitly waiting for a tasks-trace-RCU grace period after removing the attachment of a bpf_prog to a perf_event.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before 9245459a992d22fe0e92e988f49db1fec82c184aAffected
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before f9f85df30118f3f4112761e6682fc60ebcce23e5Affected
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before 9b53d2c2a38a1effc341d99be3f99fa7ef17047dAffected
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before ef1b808e3b7c98612feceedf985c2fbbeb28f956Affected
LinuxLinux
  • 6.0Affected
  • before 6.0Not affected
  • 6.1.121 through 6.1.*Not affected
  • 6.6.67 through 6.6.*Not affected
  • 6.12.6 through 6.12.*Not affected
  • 6.13 and laterNot affected

References

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