{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72028",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-72028"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "riscv: probes: save original sp in rethook trampoline",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: probes: save original sp in rethook trampoline\n\nReading a word from the stack in a kretprobe crashes a risc-v kernel.\n\n$ cd /sys/kernel/tracing/\n$ echo 'r n_tty_write $stack0' > dynamic_events\n$ echo 1 > events/kprobes/enable\nUnable to handle kernel paging request at virtual address 0000000200000128\n...\n[<ffffffff80016d16>] regs_get_kernel_stack_nth+0x26/0x38\n[<ffffffff80177196>] process_fetch_insn+0x3ee/0x760\n[<ffffffff80177836>] kretprobe_trace_func+0x116/0x1f0\n[<ffffffff8017795a>] kretprobe_dispatcher+0x4a/0x58\n[<ffffffff8013572e>] kretprobe_rethook_handler+0x5e/0x90\n[<ffffffff80180838>] rethook_trampoline_handler+0x70/0x108\n[<ffffffff8001ba32>] arch_rethook_trampoline_callback+0x12/0x1c\n[<ffffffff8001ba84>] arch_rethook_trampoline+0x48/0x94\n[<ffffffff8067872a>] tty_write+0x1a/0x30\n\nIn regs_get_kernel_stack_nth, regs->sp contains an arbitrary value.\n\narch_rethook_trampoline saves the registers from the probed function in a\nstruct pt_regs. sp is not saved. Instead, sp is decremented for\narch_rethook_trampoline's local stack.\n\nFix this crash and save the original sp along with the other registers.\nUse a0 as a temporary register, it is overwritten anyway.\n\n[pjw@kernel.org: added Fixes tag; cc'ed stable]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72028"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5da5cf48a432e30ded8d58087854e5383a36eff1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c386e1c591d72eab58ee2e69105c8cbc70928857"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2faf0198168d2017cb528a79f76c560fda3b6e94"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/91b4d76dd07f1a1f20f73dfebb42ba04ac911a56"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bc7b086a45521a986a49045907f017e3e46c763e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}