CVE-2026-89906 (GCVE-0-2026-89906)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 14:39
VLAI
Title
LoongArch: BPF: Refactor jump offset calculation in tail call
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Refactor jump offset calculation in tail call The old macro-based jmp_offset calculation derives the jump distance from a stale prior-pass code stride, which can lead to wrong branch offsets and soft lockups under extra JIT passes. Fix this by calculating the offset directly on the absolute target: "ctx->offset[insn + 1] - ctx->idx". To avoid a false 16-bit range check abort during size estimation, add a "ctx->image == NULL" guard to inject a safe dummy offset.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 , < 882b8912b7e92341fdb115ba0e2e5142a28684ff (git)
Affected: cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 , < 96f44d493c280ea161569c43d7ed0f3b0815803a (git)
Affected: cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 , < 37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8 (git)
Affected: 1a782fa32e644aa9fbae6c8488f3e61221ac96e1 (git)
Affected: 17c010fe45def335fe03a0718935416b04c7f349 (git)
Affected: f83d469e16bb1f75991ca67c56786fb2aaa42bea (git)
Affected: f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f (git)
Affected: 9262e3e04621558e875eb5afb5e726b648cd5949 (git)
Affected: 6.1.149 , < 6.2 (semver)
Affected: 6.6.103 , < 6.7 (semver)
Affected: 6.12.43 , < 6.13 (semver)
Affected: 6.15.11 , < 6.16 (semver)
Affected: 6.16.2 , < 6.17 (semver)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Refactor jump offset calculation in tail call\n\nThe old macro-based jmp_offset calculation derives the jump distance\nfrom a stale prior-pass code stride, which can lead to wrong branch\noffsets and soft lockups under extra JIT passes.\n\nFix this by calculating the offset directly on the absolute target:\n\"ctx-\u003eoffset[insn + 1] - ctx-\u003eidx\".\n\nTo avoid a false 16-bit range check abort during size estimation, add\na \"ctx-\u003eimage == NULL\" guard to inject a safe dummy offset."
        }
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            "baseSeverity": "HIGH",
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              "value": "AV:L - The bug is in the LoongArch eBPF JIT emit_bpf_tail_call() and is reached only by loading a program that uses bpf_tail_call via bpf(BPF_PROG_LOAD) on the local host. Kernel CNA guidance classifies BPF as a local attack vector.\nAC:L - The attacker fully controls the BPF bytecode, including bpf2bpf subprograms that force the extra JIT pass where the stale prior-pass stride is used. Wrong jmp_offset encodings are deterministic for a given program (the in-tree tailcall_bpf2bpf_1 case), with no race or layout outside attacker control.\nPR:L - BPF_MAP_TYPE_PROG_ARRAY is an unprivileged map type, bpf_tail_call_proto is returned before the CAP_BPF gate, and SOCKET_FILTER programs load without CAP_BPF where unprivileged BPF is enabled. Otherwise only CAP_BPF or a delegated BPF token in a user namespace is required, not init-namespace root.\nUI:N - The attacker loads the crafted program, attaches it to a socket they own or runs it with BPF_PROG_TEST_RUN, and triggers the miscompiled tail call themselves. No separate victim action is required.\nS:U - The wrong branches execute inside the host kernel\u0027s own JIT image and corrupt in-kernel control flow. That is standard kernel privilege-escalation impact, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - Miscomputed tail-call \"goto out\" branches can land inside the remaining sequence after the max_entries check, so an out-of-range index performs an OOB load of array-\u003eptrs[] and treats the result as a function pointer, disclosing kernel memory. Mid-image jumps likewise execute attacker-shaped JIT loads at kernel privilege.\nI:H - The same OOB ptrs[] load is followed by an indirect jump through prog-\u003ebpf_func, hijacking kernel control flow. Branches that skip the NULL or tail-call-count checks, or that land mid-instruction, likewise yield a kernel-mode write and control-flow primitive.\nA:H - The fix and the prior incomplete tail-call offset patch document watchdog soft lockups from wrong, including backward, branches looping in kernel context. Any such hang, oops, or panic is Availability High."
            }
          ]
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/882b8912b7e92341fdb115ba0e2e5142a28684ff"
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          "url": "https://git.kernel.org/stable/c/96f44d493c280ea161569c43d7ed0f3b0815803a"
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          "url": "https://git.kernel.org/stable/c/37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8"
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    "cveId": "CVE-2026-89906",
    "datePublished": "2026-09-16T10:32:05.157Z",
    "dateReserved": "2026-09-11T19:38:34.774Z",
    "dateUpdated": "2026-09-16T14:39:55.665Z",
    "state": "PUBLISHED"
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      "date": "2026-09-25",
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      "cve": "CVE-2026-89906",
      "id": "msrc_CVE-2026-89906",
      "initial_release_date": "2026-09-17T01:09:41.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "LoongArch: BPF: Refactor jump offset calculation in tail call",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89906.json",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Refactor jump offset calculation in tail call\n\nThe old macro-based jmp_offset calculation derives the jump distance\nfrom a stale prior-pass code stride, which can lead to wrong branch\noffsets and soft lockups under extra JIT passes.\n\nFix this by calculating the offset directly on the absolute target:\n\"ctx-\u003eoffset[insn + 1] - ctx-\u003eidx\".\n\nTo avoid a false 16-bit range check abort during size estimation, add\na \"ctx-\u003eimage == NULL\" guard to inject a safe dummy offset."
          }
        ],
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        "lastModified": "2026-09-16T15:18:16.683",
        "metrics": {
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-16T11:16:59.590",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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