CVE-2026-92517 (GCVE-0-2026-92517)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, riscv: Fix extable handling for arena load_acquire emit_atomic_ld_st() returns 1 to have build_body() skip the zext after a sub-word load_acquire. The caller does "ret = ret ?: add_exception_handler(...)", which skips add_exception_handler() on any non-zero ret, so the extable entry is missing and a faulting PROBE_ATOMIC load_acquire oopses. REG_DONT_CLEAR_MARKER leaves rd stale on fault, and the verifier still thinks the load overwrote it, so a program can leak it through a map. Check ret >= 0 before calling add_exception_handler(), and pass rd for LOAD_ACQ so the fault zeroes rd like a PROBE_MEM load. Return ret unchanged for the zext skip.
References
Impacted products
Vendor Product Version
Linux Linux Version: fb7cefabae8117c203155ef169a386bec43bbba9
Version: fb7cefabae8117c203155ef169a386bec43bbba9
Version: fb7cefabae8117c203155ef169a386bec43bbba9
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/net/bpf_jit_comp64.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "26d9496c826586338d1b8c27edfec4a19a89f462",
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.18"
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              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, riscv: Fix extable handling for arena load_acquire\n\nemit_atomic_ld_st() returns 1 to have build_body() skip the zext after\na sub-word load_acquire. The caller does \"ret = ret ?:\nadd_exception_handler(...)\", which skips add_exception_handler() on any\nnon-zero ret, so the extable entry is missing and a faulting\nPROBE_ATOMIC load_acquire oopses.\n\nREG_DONT_CLEAR_MARKER leaves rd stale on fault, and the verifier still\nthinks the load overwrote it, so a program can leak it through a map.\n\nCheck ret \u003e= 0 before calling add_exception_handler(), and pass rd for\nLOAD_ACQ so the fault zeroes rd like a PROBE_MEM load. Return ret\nunchanged for the zext skip."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:23.742Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/26d9496c826586338d1b8c27edfec4a19a89f462"
        },
        {
          "url": "https://git.kernel.org/stable/c/08fe2eaa609180c1baeb76c2629a9c82263b0427"
        },
        {
          "url": "https://git.kernel.org/stable/c/5eb8921371c6fd117d4a328b6053dfda38707df8"
        }
      ],
      "title": "bpf, riscv: Fix extable handling for arena load_acquire",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92517",
    "datePublished": "2026-09-17T16:10:25.482Z",
    "dateReserved": "2026-09-16T12:21:13.873Z",
    "dateUpdated": "2026-10-19T09:04:23.742Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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