CVE-2024-43840

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxefc9909fdce00a827a37609628223cd45bf95d0b < 077149478497b2f00ff4fd9da2c892defa6418d8affected
LinuxLinuxefc9909fdce00a827a37609628223cd45bf95d0b < d9664e6ff040798a46cdc5d401064f55b8676c83affected
LinuxLinuxefc9909fdce00a827a37609628223cd45bf95d0b < 6d218fcc707d6b2c3616b6cd24b948fd4825cfecaffected
LinuxLinuxefc9909fdce00a827a37609628223cd45bf95d0b < 19d3c179a37730caf600a97fed3794feac2b197baffected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.140 <= 6.1.*unaffected
LinuxLinux6.6.92 <= 6.6.*unaffected
LinuxLinux6.10.3 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References