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

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-10-21 12:49
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6649 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 17c010fe45def335fe03a0718935416b04c7f349 , < 50fbc294e4e96246d60cd66f98acf043a362e3a0 (git)
Affected: f83d469e16bb1f75991ca67c56786fb2aaa42bea , < 89819868cde78cb2f748533785a46a3430873f20 (git)
Affected: cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 , < 882b8912b7e92341fdb115ba0e2e5142a28684ff (git)
Affected: cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 , < 96f44d493c280ea161569c43d7ed0f3b0815803a (git)
Affected: cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 , < 37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8 (git)
Affected: 1a782fa32e644aa9fbae6c8488f3e61221ac96e1 (git)
Affected: f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f (git)
Affected: 9262e3e04621558e875eb5afb5e726b648cd5949 (git)
Affected: 6.6.103 , < 6.6.160 (semver)
Affected: 6.12.43 , < 6.12.114 (semver)
Affected: 6.1.149 , < 6.2 (semver)
Affected: 6.15.11 , < 6.16 (semver)
Affected: 6.16.2 , < 6.17 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
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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."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "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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        "dateUpdated": "2026-10-21T12:49:06.262Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/50fbc294e4e96246d60cd66f98acf043a362e3a0"
        },
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          "url": "https://git.kernel.org/stable/c/89819868cde78cb2f748533785a46a3430873f20"
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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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      "title": "LoongArch: BPF: Refactor jump offset calculation in tail call",
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    "cveId": "CVE-2026-89906",
    "datePublished": "2026-09-16T10:32:05.157Z",
    "dateReserved": "2026-09-11T19:38:34.774Z",
    "dateUpdated": "2026-10-21T12:49:06.262Z",
    "state": "PUBLISHED"
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      "date": "2026-11-04",
      "epss": "0.00175",
      "percentile": "0.07059"
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      "cve": "CVE-2026-89906",
      "id": "msrc_CVE-2026-89906",
      "initial_release_date": "2026-09-17T01:09:41.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "3",
      "product_status:under_investigation": "1",
      "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",
      "version": "6"
    },
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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."
          }
        ],
        "id": "CVE-2026-89906",
        "lastModified": "2026-10-21T13:20:31.497",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-16T11:16:59.590",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8"
          },
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            "url": "https://git.kernel.org/stable/c/882b8912b7e92341fdb115ba0e2e5142a28684ff"
          },
          {
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            "url": "https://git.kernel.org/stable/c/89819868cde78cb2f748533785a46a3430873f20"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/96f44d493c280ea161569c43d7ed0f3b0815803a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:55:40Z",
      "cve": "CVE-2026-89906",
      "id": "CVE-2026-89906",
      "initial_release_date": "2026-09-19T01:43:10Z",
      "product_status:known_affected": "13",
      "product_status:known_not_affected": "335",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89906",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89906.json",
      "version": "4"
    }
  }
}



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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.