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CVE-2025-38723

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix jump offset calculation in tailcall The extra pass of bpf_int_jit_compile() skips JIT context initialization which essentially skips offset calculation leaving out_offset = -1, so the jmp_offset in emit_bpf_tail_call is calculated by "#define jmp_offset (out_offset - (cur_offset))" is a negative number, which is wrong. The final generated assembly are as follow. 54: bgeu $a2, $t1, -8 # 0x0000004c 58: addi.d $a6, $s5, -1 5c: bltz $a6, -16 # 0x0000004c 60: alsl.d $t2, $a2, $a1, 0x3 64: ld.d $t2, $t2, 264 68: beq $t2, $zero, -28 # 0x0000004c Before apply this patch, the follow test case will reveal soft lock issues. cd tools/testing/selftests/bpf/ ./test_progs --allow=tailcalls/tailcall_bpf2bpf_1 dmesg: watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:42.130000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-38723",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-04T16:15:42.130",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Fix jump offset calculation in tailcall\n\nThe extra pass of bpf_int_jit_compile() skips JIT context initialization\nwhich essentially skips offset calculation leaving out_offset = -1, so\nthe jmp_offset in emit_bpf_tail_call is calculated by\n\n\"#define jmp_offset (out_offset - (cur_offset))\"\n\nis a negative number, which is wrong. The final generated assembly are\nas follow.\n\n54:\tbgeu        \t$a2, $t1, -8\t    # 0x0000004c\n58:\taddi.d      \t$a6, $s5, -1\n5c:\tbltz        \t$a6, -16\t    # 0x0000004c\n60:\talsl.d      \t$t2, $a2, $a1, 0x3\n64:\tld.d        \t$t2, $t2, 264\n68:\tbeq         \t$t2, $zero, -28\t    # 0x0000004c\n\nBefore apply this patch, the follow test case will reveal soft lock issues.\n\ncd tools/testing/selftests/bpf/\n./test_progs --allow=tailcalls/tailcall_bpf2bpf_1\n\ndmesg:\nwatchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nLoongArch: BPF: Corrección del cálculo del desplazamiento de salto en tailcall\n\nLa pasada extra de bpf_int_jit_compile() omite la inicialización del contexto JIT, lo que esencialmente omite el cálculo del desplazamiento dejando out_offset = -1, por lo que el jmp_offset en emit_bpf_tail_call se calcula mediante\n\n'#define jmp_offset (out_offset - (cur_offset))'\n\nes un número negativo, lo cual es incorrecto. El ensamblado final generado es el siguiente.\n\n54:\tbgeu        \t$a2, $t1, -8\t    # 0x0000004c\n58:\taddi.d      \t$a6, $s5, -1\n5c:\tbltz        \t$a6, -16\t    # 0x0000004c\n60:\talsl.d      \t$t2, $a2, $a1, 0x3\n64:\tld.d        \t$t2, $t2, 264\n68:\tbeq         \t$t2, $zero, -28\t    # 0x0000004c\n\nAntes de aplicar este parche, el siguiente caso de prueba revelará problemas de bloqueo suave.\n\ncd tools/testing/selftests/bpf/\n./test_progs --allow=tailcalls/tailcall_bpf2bpf_1\n\ndmesg:\nwatchdog: BUG: bloqueo suave - CPU#2 atascada durante 26s! [test_progs:25056]"
    }
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          "product": "SIMATIC CN 4100",
          "defaultStatus": "unknown",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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