CVE-2025-68742 (GCVE-0-2025-68742)

Vulnerability from cvelistv5 – Published: 2025-12-24 12:09 – Updated: 2026-10-15 01:10
VLAI
Title
bpf: Fix invalid prog->stats access when update_effective_progs fails
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix invalid prog->stats access when update_effective_progs fails Syzkaller triggers an invalid memory access issue following fault injection in update_effective_progs. The issue can be described as follows: __cgroup_bpf_detach update_effective_progs compute_effective_progs bpf_prog_array_alloc <-- fault inject purge_effective_progs /* change to dummy_bpf_prog */ array->items[index] = &dummy_bpf_prog.prog ---softirq start--- __do_softirq ... __cgroup_bpf_run_filter_skb __bpf_prog_run_save_cb bpf_prog_run stats = this_cpu_ptr(prog->stats) /* invalid memory access */ flags = u64_stats_update_begin_irqsave(&stats->syncp) ---softirq end--- static_branch_dec(&cgroup_bpf_enabled_key[atype]) The reason is that fault injection caused update_effective_progs to fail and then changed the original prog into dummy_bpf_prog.prog in purge_effective_progs. Then a softirq came, and accessing the members of dummy_bpf_prog.prog in the softirq triggers invalid mem access. To fix it, skip updating stats when stats is NULL.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 492ecee892c2a4ba6a14903d5d586ff750b7e805 , < 93d1964773ff513c9bd530f7686d3e48b786fa6b (git)
Affected: 492ecee892c2a4ba6a14903d5d586ff750b7e805 , < bf2c990b012100610c0f1ec5c4ea434da2d080c2 (git)
Affected: 492ecee892c2a4ba6a14903d5d586ff750b7e805 , < 539137e3038ce6f953efd72110110f03c14c7d97 (git)
Affected: 492ecee892c2a4ba6a14903d5d586ff750b7e805 , < 56905bb70c8b88421709bb4e32fcba617aa37d41 (git)
Affected: 492ecee892c2a4ba6a14903d5d586ff750b7e805 , < 2579c356ccd35d06238b176e4b460978186d804b (git)
Affected: 492ecee892c2a4ba6a14903d5d586ff750b7e805 , < 7dc211c1159d991db609bdf4b0fb9033c04adcbc (git)
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Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix invalid prog-\u003estats access when update_effective_progs fails\n\nSyzkaller triggers an invalid memory access issue following fault\ninjection in update_effective_progs. The issue can be described as\nfollows:\n\n__cgroup_bpf_detach\n  update_effective_progs\n    compute_effective_progs\n      bpf_prog_array_alloc \u003c-- fault inject\n  purge_effective_progs\n    /* change to dummy_bpf_prog */\n    array-\u003eitems[index] = \u0026dummy_bpf_prog.prog\n\n---softirq start---\n__do_softirq\n  ...\n    __cgroup_bpf_run_filter_skb\n      __bpf_prog_run_save_cb\n        bpf_prog_run\n          stats = this_cpu_ptr(prog-\u003estats)\n          /* invalid memory access */\n          flags = u64_stats_update_begin_irqsave(\u0026stats-\u003esyncp)\n---softirq end---\n\n  static_branch_dec(\u0026cgroup_bpf_enabled_key[atype])\n\nThe reason is that fault injection caused update_effective_progs to fail\nand then changed the original prog into dummy_bpf_prog.prog in\npurge_effective_progs. Then a softirq came, and accessing the members of\ndummy_bpf_prog.prog in the softirq triggers invalid mem access.\n\nTo fix it, skip updating stats when stats is NULL."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: Corrige el acceso inv\u00e1lido a prog -\u003e stats cuando update_effective_progs falla\n\nSyzkaller desencadena un problema de acceso a memoria inv\u00e1lido despu\u00e9s de la inyecci\u00f3n de fallos en update_effective_progs. El problema se puede describir de la siguiente manera:\n\n__cgroup_bpf_detach\n  update_effective_progs\n    compute_effective_progs\n      bpf_prog_array_alloc  \u003c- - inyecci\u00f3n de fallo\n  purge_effective_progs\n    /* cambio a dummy_bpf_prog */\n    array -\u003e items[index] = \u0026dummy_bpf_prog.prog\n\n---inicio de softirq---\n__do_softirq\n  ...\n    __cgroup_bpf_run_filter_skb\n      __bpf_prog_run_save_cb\n        bpf_prog_run\n          stats = this_cpu_ptr(prog -\u003e stats)\n          /* acceso a memoria inv\u00e1lido */\n          flags = u64_stats_update_begin_irqsave(\u0026stats -\u003e syncp)\n---fin de softirq---\n\n  static_branch_dec(\u0026cgroup_bpf_enabled_key[atype])\n\nLa raz\u00f3n es que la inyecci\u00f3n de fallos provoc\u00f3 que update_effective_progs fallara y luego cambi\u00f3 el prog original a dummy_bpf_prog.prog en purge_effective_progs. Luego lleg\u00f3 una softirq, y el acceso a los miembros de dummy_bpf_prog.prog en la softirq desencadena un acceso a memoria inv\u00e1lido.\n\nPara solucionarlo, se omite la actualizaci\u00f3n de stats cuando stats es NULL."
          }
        ],
        "id": "CVE-2025-68742",
        "lastModified": "2026-10-15T02:18:13.003",
        "metrics": {},
        "published": "2025-12-24T13:16:29.147",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2579c356ccd35d06238b176e4b460978186d804b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/539137e3038ce6f953efd72110110f03c14c7d97"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/56905bb70c8b88421709bb4e32fcba617aa37d41"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7dc211c1159d991db609bdf4b0fb9033c04adcbc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/93d1964773ff513c9bd530f7686d3e48b786fa6b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bf2c990b012100610c0f1ec5c4ea434da2d080c2"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-18T19:49:20+00:00",
      "cve": "CVE-2025-68742",
      "id": "CVE-2025-68742",
      "initial_release_date": "2025-12-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix invalid prog-\u003estats access when update_effective_progs fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68742.json",
      "version": "3"
    }
  }
}



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