CVE-2026-89799 (GCVE-0-2026-89799)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:30 – Updated: 2026-09-21 13:15
VLAI
Title
bpf: Disable preemption in bpf_get_stackid
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Disable preemption in bpf_get_stackid The get_perf_callchain call needs disabled preemption plus we need it disabled as long as we access its returned trace entries buffer. Note the bpf_get_stackid_pe function is executed already with preemption disabled.
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: d5a3b1f691865be576c2bffa708549b8cdccda19 , < 18c71e4b65ee60b8611fc071bdd7159f10185117 (git)
Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < ccf481d73bce6e851cec364fe831c86fe66877cf (git)
Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf (git)
Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < 15f1bd8574662f1b7b26aaa2e23ebf4066f0117d (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/stackmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "18c71e4b65ee60b8611fc071bdd7159f10185117",
              "status": "affected",
              "version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
              "versionType": "git"
            },
            {
              "lessThan": "ccf481d73bce6e851cec364fe831c86fe66877cf",
              "status": "affected",
              "version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
              "versionType": "git"
            },
            {
              "lessThan": "c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf",
              "status": "affected",
              "version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
              "versionType": "git"
            },
            {
              "lessThan": "15f1bd8574662f1b7b26aaa2e23ebf4066f0117d",
              "status": "affected",
              "version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
              "versionType": "git"
            }
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/stackmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disable preemption in bpf_get_stackid\n\nThe get_perf_callchain call needs disabled preemption plus we need\nit disabled as long as we access its returned trace entries buffer.\n\nNote the bpf_get_stackid_pe function is executed already with\npreemption disabled."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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": [
            {
              "lang": "en",
              "value": "AV:L - bpf_get_stackid is a tracing BPF helper (kprobe, tracepoint, raw_tp, perf_event, tracing/fentry) reached only after a local bpf(2) PROG_LOAD and attach; kernel CNA guidance classifies BPF as Local, with no network or USB path into this helper.\nAC:L - The attacker controls both sides of the race: a preemptible raw_tp/tracing program with a small STACK_TRACE map, and a same-CPU get_perf_callchain with larger max_depth that reuses the per-CPU entry after put_callchain_entry(). On PREEMPT kernels (e.g. Android) raw_tp uses migrate_disable only, so pinning and retries make the window reliably hittable.\nPR:L - Loading the required tracing programs needs CAP_BPF and CAP_PERFMON at bpf_prog_load(), and STACK_TRACE maps need CAP_BPF. Per kernel CNA guidance these are Low because BPF tokens and user namespaces can delegate them to non-init-namespace users, not only real root.\nUI:N - The attacker loads their own BPF program, attaches it to a tracepoint they can fire, and invokes bpf_get_stackid through their own syscalls or pinned threads; no victim mount, file open, or other user action is required.\nS:U - The out-of-bounds write corrupts the stack-map bucket slab inside the same host kernel security authority, enabling local privilege escalation; it does not cross a VM, IOMMU, or other distinct trust boundary.\nC:H - After put_callchain_entry(), a reused per-CPU entry can inflate trace-\u003enr so memcpy/jhash2 and the build-id loop copy kernel instruction pointers past the attacker-sized stack_map_bucket, which is kernel memory corruption that can be turned into an arbitrary read primitive.\nI:H - Without a remaining size cap on the reused trace-\u003enr, memcpy into the preallocated stack_map_bucket (sized to a small map value_size) or the bpf_stack_build_id store loop is an attacker-sized kernel heap OOB write, up to PERF_MAX_STACK_DEPTH frames, that can smash adjacent slab and hijack control flow.\nA:H - The same unbounded heap write past a small stack-map bucket causes a kernel oops or panic even when not fully weaponized, matching CNA guidance that any kernel crash or memory-corrupting OOB write is Availability High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T13:15:04.283Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d"
        }
      ],
      "title": "bpf: Disable preemption in bpf_get_stackid",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89799",
    "datePublished": "2026-09-16T10:30:31.487Z",
    "dateReserved": "2026-09-11T19:38:34.767Z",
    "dateUpdated": "2026-09-21T13:15:04.283Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89799",
      "date": "2026-09-25",
      "epss": "0.00175",
      "percentile": "0.06203"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-24T02:41:48.000Z",
      "cve": "CVE-2026-89799",
      "id": "msrc_CVE-2026-89799",
      "initial_release_date": "2026-09-17T01:13:16.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf: Disable preemption in bpf_get_stackid",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89799.json",
      "version": "4"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "kernel/bpf/stackmap.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
                  },
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                    "versionType": "git"
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                    "versionType": "git"
                  }
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                "vendor": "Linux",
                "versions": [
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                    "version": "0",
                    "versionType": "semver"
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                    "version": "6.12.111",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "6.18.*",
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                    "version": "6.18.51",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "7.2.5",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disable preemption in bpf_get_stackid\n\nThe get_perf_callchain call needs disabled preemption plus we need\nit disabled as long as we access its returned trace entries buffer.\n\nNote the bpf_get_stackid_pe function is executed already with\npreemption disabled."
          }
        ],
        "id": "CVE-2026-89799",
        "lastModified": "2026-09-21T14:17:27.000",
        "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2026-09-16T11:16:44.767",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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