Vulnerability-Lookup

FKIE_CVE-2026-74583

Vulnerability from fkie_nvd - Published: 2026-08-21 17:16 - Updated: 2026-08-25 06:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0e7a8cf8895b06d07c7311f028eba16ad742b9bc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/47d7f7051253bdc02b1d245d87e38f16d31a74df
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5ec9001be6d0eb527251125632ec8fe88278897f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7897198b26445b4009a057bda1986b94a99e5d5f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/820f083c294ad6d319c02a7d43294f2ed2565139
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a17f636c9330eac879822ce29f998e5abd1b72c1
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ae9aff87025219005a2d16b4fe83d6f24643e50d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b969984b2bdc85d721ce4047cd270cd37ec705a2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7897198b26445b4009a057bda1986b94a99e5d5f",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "820f083c294ad6d319c02a7d43294f2ed2565139",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "5ec9001be6d0eb527251125632ec8fe88278897f",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "b969984b2bdc85d721ce4047cd270cd37ec705a2",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "a17f636c9330eac879822ce29f998e5abd1b72c1",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "0e7a8cf8895b06d07c7311f028eba16ad742b9bc",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "ae9aff87025219005a2d16b4fe83d6f24643e50d",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "47d7f7051253bdc02b1d245d87e38f16d31a74df",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "lessThan": "3.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\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."
    }
  ],
  "id": "CVE-2026-74583",
  "lastModified": "2026-08-25T06:18:32.033",
  "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"
      }
    ]
  },
  "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"
}

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

Vulnerability from cvelistv5 – Published: 2026-08-21 16:31 – Updated: 2026-08-25 05:40

Title

net/sched: cls_route: fix fastmap use-after-free on filter

Summary

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 mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/7897198b26445b400…
https://git.kernel.org/stable/c/820f083c294ad6d31…
https://git.kernel.org/stable/c/5ec9001be6d0eb527…
https://git.kernel.org/stable/c/b969984b2bdc85d72…
https://git.kernel.org/stable/c/a17f636c9330eac87…
https://git.kernel.org/stable/c/0e7a8cf8895b06d07…
https://git.kernel.org/stable/c/ae9aff87025219005…
https://git.kernel.org/stable/c/47d7f7051253bdc02…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7897198b26445b4009a057bda1986b94a99e5d5f",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "820f083c294ad6d319c02a7d43294f2ed2565139",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "5ec9001be6d0eb527251125632ec8fe88278897f",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "b969984b2bdc85d721ce4047cd270cd37ec705a2",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "a17f636c9330eac879822ce29f998e5abd1b72c1",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "0e7a8cf8895b06d07c7311f028eba16ad742b9bc",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "ae9aff87025219005a2d16b4fe83d6f24643e50d",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            },
            {
              "lessThan": "47d7f7051253bdc02b1d245d87e38f16d31a74df",
              "status": "affected",
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "lessThan": "3.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "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 - Exploitation requires local rtnetlink RTM_NEWTFILTER/RTM_DELTFILTER (tc filter add/change/del route) through sendmsg\u2192rtnetlink_rcv_msg\u2192tc_new_tfilter/tc_del_tfilter\u2192route4_change/route4_delete; remote packets alone cannot trigger the filter-deletion side of the race.\nAC:L - The attacker controls both race sides\u2014concurrent route filter add/change/delete via netlink plus traffic through route4_classify on clsact/ingress/egress qdiscs; ZDI and independent reporter stress tests reproduced KASAN slab-use-after-free without uncontrollable prerequisites.\nPR:L - Non-GET rtnetlink handlers require netlink_net_capable(CAP_NET_ADMIN), evaluated against the target network namespace user_ns; an unprivileged local user obtains CAP_NET_ADMIN via user+network namespaces (unshare -Urn) and configures clsact with route filters.\nUI:N - No victim interaction is needed; the attacker configures the route classifier, drives concurrent filter churn, and generates matching traffic from their own processes.\nS:U - Impact is kernel memory corruption within the same kernel security boundary (local privilege escalation/DoS); it does not cross VM, hypervisor, or IOMMU boundaries.\nC:H - Slab use-after-free: a stale fastmap entry retains a freed route4_filter pointer and route4_classify dereferences f-\u003eres from freed kmalloc memory; KASAN confirmed slab-use-after-free, enabling arbitrary kernel read via heap reclaim/spray.\nI:H - UAF of the kmalloc route4_filter object allows attacker-controlled heap spraying to reclaim the freed slot and obtain write/control-flow hijacking primitives; memory corruption is exploitable beyond a simple crash.\nA:H - UAF on the fastmap hot path causes kernel oops/panic under concurrent filter churn; KASAN slab-use-after-free was confirmed during add/delete stress testing, providing reliable denial of service even without full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:10.077Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7897198b26445b4009a057bda1986b94a99e5d5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/820f083c294ad6d319c02a7d43294f2ed2565139"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ec9001be6d0eb527251125632ec8fe88278897f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b969984b2bdc85d721ce4047cd270cd37ec705a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a17f636c9330eac879822ce29f998e5abd1b72c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e7a8cf8895b06d07c7311f028eba16ad742b9bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae9aff87025219005a2d16b4fe83d6f24643e50d"
        },
        {
          "url": "https://git.kernel.org/stable/c/47d7f7051253bdc02b1d245d87e38f16d31a74df"
        }
      ],
      "title": "net/sched: cls_route: fix fastmap use-after-free on filter",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74583",
    "datePublished": "2026-08-21T16:31:55.886Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:10.077Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2026-74583

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

Tags

Sightings

Nomenclature