CVE-2026-74583 (GCVE-0-2026-74583)

Vulnerability from cvelistv5 – Published: 2026-08-21 16:31 – Updated: 2026-10-16 19:05
VLAI
Title
net/sched: cls_route: fix fastmap use-after-free on filter
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_route: fix fastmap use-after-free on filter The route4 classifier maintains a 16-slot fastmap cache that stores raw struct route4_filter pointers indexed by (id, iif). The reader (route4_classify) populates this cache via route4_set_fastmap() for every classified packet that hits a filter. The writer (route4_delete, route4_change) clears the cache via route4_reset_fastmap() before RCU-deferred kfree of the filter. This creates a UAF race: 1. Reader walks the RCU-protected bucket chain, finds filter f 2. Writer unlinks f, calls route4_reset_fastmap(), then tcf_queue_work() 3. Reader calls route4_set_fastmap() and writes f into the cache *after* the writer's reset, caching a pointer about to be freed 4. After the RCU grace period, kfree(f) executes 5. Next classified packet on the same (id, iif) tuple hits the stale fastmap entry and reads f->res from freed memory Reproduced with an mdelay(100) accelerator in route4_set_fastmap() and a concurrent add/delete stress test (provided by both zdi and Santosh). Both triggered KASAN slab-use-after-free reports in the route4 fastmap paths. Fix: Introduce a per-filter boolean dying flag to suppress stale fastmap republishing by in-flight readers.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:01 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < 7897198b26445b4009a057bda1986b94a99e5d5f (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < 820f083c294ad6d319c02a7d43294f2ed2565139 (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < 5ec9001be6d0eb527251125632ec8fe88278897f (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < b969984b2bdc85d721ce4047cd270cd37ec705a2 (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < a17f636c9330eac879822ce29f998e5abd1b72c1 (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < 0e7a8cf8895b06d07c7311f028eba16ad742b9bc (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < ae9aff87025219005a2d16b4fe83d6f24643e50d (git)
Affected: 1109c00547fc66df45b9ff923544be4c1e1bec13 , < 47d7f7051253bdc02b1d245d87e38f16d31a74df (git)
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Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_route: fix fastmap use-after-free on filter\n\nThe route4 classifier maintains a 16-slot fastmap cache that stores raw\nstruct route4_filter pointers indexed by (id, iif). The reader\n(route4_classify) populates this cache via route4_set_fastmap() for every\nclassified packet that hits a filter. The writer (route4_delete,\nroute4_change) clears the cache via route4_reset_fastmap() before\nRCU-deferred kfree of the filter.\n\nThis creates a UAF race:\n 1. Reader walks the RCU-protected bucket chain, finds filter f\n 2. Writer unlinks f, calls route4_reset_fastmap(), then tcf_queue_work()\n 3. Reader calls route4_set_fastmap() and writes f into the cache\n    *after* the writer\u0027s reset, caching a pointer about to be freed\n 4. After the RCU grace period, kfree(f) executes\n 5. Next classified packet on the same (id, iif) tuple hits the stale\n    fastmap entry and reads f-\u003eres from freed memory\n\nReproduced with an mdelay(100) accelerator in route4_set_fastmap() and a\nconcurrent add/delete stress test (provided by both zdi and Santosh).\nBoth triggered KASAN slab-use-after-free reports in the route4 fastmap\npaths.\n\nFix:\nIntroduce a per-filter boolean dying flag to suppress stale fastmap\nrepublishing by in-flight readers."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/sched: cls_route: correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n de fastmap en el filtro\n\nEl clasificador route4 mantiene una cach\u00e9 fastmap de 16 ranuras que almacena punteros brutos de struct route4_filter indexados por (id, iif). El lector (route4_classify) rellena esta cach\u00e9 a trav\u00e9s de route4_set_fastmap() para cada paquete clasificado que coincide con un filtro. El escritor (route4_delete, route4_change) borra la cach\u00e9 a trav\u00e9s de route4_reset_fastmap() antes de la liberaci\u00f3n kfree diferida por RCU del filtro.\n\nEsto crea una condici\u00f3n de carrera UAF:\n1. El lector recorre la cadena de cubos protegida por RCU, encuentra el filtro f\n2. El escritor desvincula f, llama a route4_reset_fastmap(), luego tcf_queue_work()\n3. El lector llama a route4_set_fastmap() y escribe f en la cach\u00e9 despu\u00e9s del reinicio del escritor, almacenando en cach\u00e9 un puntero que est\u00e1 a punto de ser liberado\n4. Despu\u00e9s del per\u00edodo de gracia de RCU, se ejecuta kfree(f)\n5. El siguiente paquete clasificado en la misma tupla (id, iif) accede a la entrada fastmap obsoleta y lee f -\u003e res de memoria liberada\n\nReproducido con un acelerador mdelay(100) en route4_set_fastmap() y una prueba de estr\u00e9s concurrente de a\u00f1adir/eliminar (proporcionada tanto por zdi como por Santosh). Ambos activaron informes de uso despu\u00e9s de liberaci\u00f3n de slab de KASAN en las rutas fastmap de route4.\n\nSoluci\u00f3n:\nIntroducir un indicador booleano \u0027dying\u0027 por filtro para suprimir la republicaci\u00f3n de fastmap obsoleta por parte de lectores en curso."
          }
        ],
        "id": "CVE-2026-74583",
        "lastModified": "2026-10-16T20:17:40.370",
        "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"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-74583",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T19:01:17.964713Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-21T17:16:44.643",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0e7a8cf8895b06d07c7311f028eba16ad742b9bc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/47d7f7051253bdc02b1d245d87e38f16d31a74df"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5ec9001be6d0eb527251125632ec8fe88278897f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7897198b26445b4009a057bda1986b94a99e5d5f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/820f083c294ad6d319c02a7d43294f2ed2565139"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a17f636c9330eac879822ce29f998e5abd1b72c1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ae9aff87025219005a2d16b4fe83d6f24643e50d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b969984b2bdc85d721ce4047cd270cd37ec705a2"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-14T22:30:49+00:00",
      "cve": "CVE-2026-74583",
      "id": "CVE-2026-74583",
      "initial_release_date": "2026-08-21T00:00:00+00:00",
      "product_status:fixed": "150",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "199",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cls_route: fix fastmap use-after-free on filter",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74583.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-24T00:04:01Z",
      "cve": "CVE-2026-74583",
      "id": "CVE-2026-74583",
      "initial_release_date": "2026-08-22T00:52:31Z",
      "product_status:known_affected": "391",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "43",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74583",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-74583.json",
      "version": "11"
    }
  }
}



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