LoongArch: BPF: Fix jump offset calculation in tailcall

{
  "id": "4ef217d81f42ba2d1da75bb8a2467bcdbc49041853afc8f2cf30f07502d904d9",
  "url": "https://osv.dev/vulnerability/CVE-2025-38723",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LoongArch: BPF: Fix jump offset calculation in tailcall",
    "summary": "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]",
    "evidence": "osv:CVE-2025-38723",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.149",
            "evidence": "/affected/1/ranges"
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            "value": "6.6.103",
            "evidence": "/affected/1/ranges"
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            "value": "6.12.43",
            "evidence": "/affected/1/ranges"
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            "value": "6.15.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.2",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38723",
      "aliases": [
        "CVE-2025-38723"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:50.719779325Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
        "https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349",
        "https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1",
        "https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949",
        "https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3",
        "https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f",
        "https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38723.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38723",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38723.json"
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    "related_cves": [
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        "value": "CVE-2025-38723",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519445,
  "published_at": "2025-09-04T15:33:16.547+00:00"
}