bpf, arm64: Fixed a BTI error on returning to patched function

{
  "id": "d1a85edaba0ccef07ff6ebcf745c5f2bdc65d19eebe6ed043ac9e3e169634ffb",
  "url": "https://osv.dev/vulnerability/CVE-2023-53634",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf, arm64: Fixed a BTI error on returning to patched function",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fixed a BTI error on returning to patched function When BPF_TRAMP_F_CALL_ORIG is set, BPF trampoline uses BLR to jump back to the instruction next to call site to call the patched function. For BTI-enabled kernel, the instruction next to call site is usually PACIASP, in this case, it's safe to jump back with BLR. But when the call site is not followed by a PACIASP or bti, a BTI exception is triggered. Here is a fault log: Unhandled 64-bit el1h sync exception on CPU0, ESR 0x0000000034000002 -- BTI CPU: 0 PID: 263 Comm: test_progs Tainted: GF Hardware name: linux,dummy-virt (DT) pstate: 40400805 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=-c) pc : bpf_fentry_test1+0xc/0x30 lr : bpf_trampoline_6442573892_0+0x48/0x1000 sp : ffff80000c0c3a50 x29: ffff80000c0c3a90 x28: ffff0000c2e6c080 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000050 x23: 0000000000000000 x22: 0000ffffcfd2a7f0 x21: 000000000000000a x20: 0000ffffcfd2a7f0 x19: 0000000000000000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffffcfd2a7f0 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: ffff80000914f5e4 x9 : ffff8000082a1528 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0101010101010101 x5 : 0000000000000000 x4 : 00000000fffffff2 x3 : 0000000000000001 x2 : ffff8001f4b82000 x1 : 0000000000000000 x0 : 0000000000000001 Kernel panic -",
    "evidence": "osv:CVE-2023-53634",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.25",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53634",
      "aliases": [
        "CVE-2023-53634"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "efc9909fdce00a827a37609628223cd45bf95d0b"
                },
                {
                  "fixed": "8b9c64942ada229f52fe6f1b537a50f88b3c2673"
                },
                {
                  "fixed": "eabc166919d169e105263974991f52b0351e431a"
                },
                {
                  "fixed": "738a96c4a8c36950803fdd27e7c30aca92dccefd"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53634.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.25"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53634.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.563661154Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/738a96c4a8c36950803fdd27e7c30aca92dccefd",
        "https://git.kernel.org/stable/c/8b9c64942ada229f52fe6f1b537a50f88b3c2673",
        "https://git.kernel.org/stable/c/eabc166919d169e105263974991f52b0351e431a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53634.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53634",
        "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/2023/53xxx/CVE-2023-53634.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53634",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520139,
  "published_at": "2025-10-07T15:19:36.306+00:00"
}