CVE-2026-93135

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject programs with inlined helpers if JIT is not available When an architecture (such as LoongArch, ARM64, and RISC-V) implements bpf_jit_inlines_helper_call(), the verifier skips rewriting the helper call offset (insn->imm) in bpf_do_misc_fixups(). This is because the helper is expected to be inlined by the JIT compiler later. Therefore, insn->imm remains as the raw helper enum ID. However, if JIT is disabled at runtime (net.core.bpf_jit_enable=0) or if JIT compilation fails dynamically (e.g., due to OOM), the program falls back to the BPF interpreter. When the interpreter executes (__bpf_call_base + insn->imm) with the unpatched raw ID, it jumps into an invalid address space, triggering an instruction alignment fault or a kernel panic. Although these helpers have valid C implementations in the kernel, the omission of offset rewriting makes runtime interpreter fallback fatal. Fix this by setting 'prog->jit_required = 1' when helper call rewriting is skipped for JIT inlining. This ensures that such programs are safely rejected if JIT is not available, preventing the runtime kernel panic.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:18:08.373000

Last modified

2026-10-19 10:17:03.513000

View original CVE JSON

{
  "id": "CVE-2026-93135",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:18:08.373",
  "lastModified": "2026-10-19T10:17:03.513",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject programs with inlined helpers if JIT is not available\n\nWhen an architecture (such as LoongArch, ARM64, and RISC-V) implements\nbpf_jit_inlines_helper_call(), the verifier skips rewriting the helper\ncall offset (insn->imm) in bpf_do_misc_fixups(). This is because the\nhelper is expected to be inlined by the JIT compiler later. Therefore,\ninsn->imm remains as the raw helper enum ID.\n\nHowever, if JIT is disabled at runtime (net.core.bpf_jit_enable=0) or\nif JIT compilation fails dynamically (e.g., due to OOM), the program\nfalls back to the BPF interpreter.\n\nWhen the interpreter executes (__bpf_call_base + insn->imm) with the\nunpatched raw ID, it jumps into an invalid address space, triggering\nan instruction alignment fault or a kernel panic.\n\nAlthough these helpers have valid C implementations in the kernel, the\nomission of offset rewriting makes runtime interpreter fallback fatal.\n\nFix this by setting 'prog->jit_required = 1' when helper call rewriting\nis skipped for JIT inlining. This ensures that such programs are safely\nrejected if JIT is not available, preventing the runtime kernel panic."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/bpf/fixups.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2ddec2c80b4402c293c7e6e0881cecaaf77e8cec",
              "lessThan": "21c6445366795fa3a89954e1d318e7c8afdef843",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "2ddec2c80b4402c293c7e6e0881cecaaf77e8cec",
              "lessThan": "f1c27922576edccb99d0257827d09bd05c0304a6",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "kernel/bpf/fixups.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.10",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.10",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/21c6445366795fa3a89954e1d318e7c8afdef843",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f1c27922576edccb99d0257827d09bd05c0304a6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}