Riskcovery

CVE-2024-43840

bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG

State
Published
Severity
7.8 High
Published
Aug 17, 2024
Updated
Aug 5, 2026
Reserved
Aug 17, 2024

Read the record on cve.org

Description

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

bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG

When BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls __bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them the struct bpf_tramp_image *im pointer as an argument in R0.

The trampoline generation code uses emit_addr_mov_i64() to emit instructions for moving the bpf_tramp_image address into R0, but emit_addr_mov_i64() assumes the address to be in the vmalloc() space and uses only 48 bits. Because bpf_tramp_image is allocated using kzalloc(), its address can use more than 48-bits, in this case the trampoline will pass an invalid address to __bpf_tramp_enter/exit() causing a kernel crash.

Fix this by using emit_a64_mov_i64() in place of emit_addr_mov_i64() as it can work with addresses that are greater than 48-bits.

Scores

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

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • efc9909fdce00a827a37609628223cd45bf95d0b to before 077149478497b2f00ff4fd9da2c892defa6418d8Affected
  • efc9909fdce00a827a37609628223cd45bf95d0b to before d9664e6ff040798a46cdc5d401064f55b8676c83Affected
  • efc9909fdce00a827a37609628223cd45bf95d0b to before 6d218fcc707d6b2c3616b6cd24b948fd4825cfecAffected
  • efc9909fdce00a827a37609628223cd45bf95d0b to before 19d3c179a37730caf600a97fed3794feac2b197bAffected
LinuxLinux
  • 6.0Affected
  • before 6.0Not affected
  • 6.1.140 through 6.1.*Not affected
  • 6.6.92 through 6.6.*Not affected
  • 6.10.3 through 6.10.*Not affected
  • 6.11 and laterNot affected

References

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