CVE-2026-99167 (GCVE-0-2026-99167)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-31 12:44
VLAI
Title
net/sched: fix use-after-free in __tcf_action_put()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: fix use-after-free in __tcf_action_put() __tcf_action_put() decrements the reference count before decrementing the binding count. Another thread can free the action between these operations, causing the binding-count update to access freed memory. KASAN reports it as: BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340 Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64 Hold the action IDR mutex across both counter updates and IDR removal, keeping cleanup outside the lock.
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 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16af6067392c40e454e49eec834843ab03643d96 , < 4d83a3fc03bc595dd39b79ad61288738fbb1f2ba (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < fd01abed2568209f7daaf60e5ee68ae4a4744f48 (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < fcc7d734ceccfab8ec3398c5b34f8e775d459507 (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < fde33eb9955d819af282d5f5e84684eaec248291 (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < 969ad6f2b266f383b44194d50d15631969b26222 (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < 2465d27ef90de9105c2bffb6c35f8ce08918e642 (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < 2e012e431aa271ef3c84206f48854f539c03bff0 (git)
Affected: 16af6067392c40e454e49eec834843ab03643d96 , < 7b16eb911091aae237a8673da94e4dfb9cd21d54 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix use-after-free in __tcf_action_put()\n\n__tcf_action_put() decrements the reference count before decrementing the\nbinding count. Another thread can free the action between these operations,\ncausing the binding-count update to access freed memory. KASAN reports it\nas:\n\n  BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340\n  Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64\n\nHold the action IDR mutex across both counter updates and IDR removal,\nkeeping cleanup outside the lock."
        }
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            "version": "3.1"
          },
          "scenarios": [
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              "value": "AV:L - An attacker reaches the patched __tcf_action_put() through local NETLINK_ROUTE messages: sendmsg() -\u003e rtnetlink_rcv_msg() -\u003e tc_new_tfilter()/tc_del_tfilter() -\u003e tcf_action_destroy(). No received network packet supplies the action release operation.\nAC:L - RTM_NEWTFILTER and RTM_DELTFILTER are unlocked for flower on clsact/ingress; the attacker can race a failing bind request\u0027s tcf_action_destroy() against deletion cleanup of the same indexed action. One put takes tcfa_refcnt 2-\u003e1 before tcfa_bindcnt while the other takes 1-\u003e0 and frees it, so both sides are attacker-controlled.\nPR:L - rtnetlink_rcv_msg() requires netlink_net_capable(skb, CAP_NET_ADMIN), but checks the user namespace owning the socket\u0027s network namespace. An unprivileged user can use unshare(CLONE_NEWUSER|CLONE_NEWNET) to obtain that capability in the new namespace and configure its clsact/flower objects.\nUI:N - After creating the namespace and TC objects, the attacker alone sends the racing RTM_NEWTFILTER and RTM_DELTFILTER messages; no victim action is required.\nS:U - __tcf_action_put() corrupts memory in the same host kernel that processes and authorizes the NETLINK_ROUTE requests; exploitation does not cross a VM or IOMMU security boundary.\nC:H - After free_tcf() queues p for reclamation through kfree_rcu(), the stale path retains p and later accesses the reclaimed tcfa_bindcnt slot. Action-heap grooming can turn corruption of a replacement object into control-flow execution and arbitrary kernel-memory disclosure.\nI:H - atomic_dec(\u0026p-\u003etcfa_bindcnt) performs a 32-bit write after the tc_action allocation has been reclaimed; spraying a same-cache replacement can corrupt its refcount, length, or control data and enable kernel code execution or arbitrary modification.\nA:H - The reported KASAN slab-use-after-free is the stale atomic_dec() write in __tcf_action_put(); corrupting the replacement object can cause an oops or panic, and the attacker can repeatedly attempt the netlink race."
            }
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      ],
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        "dateUpdated": "2026-10-31T12:44:30.175Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "datePublished": "2026-10-28T10:35:18.850Z",
    "dateReserved": "2026-09-25T10:25:14.398Z",
    "dateUpdated": "2026-10-31T12:44:30.175Z",
    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
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      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99167.json",
      "version": "4"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix use-after-free in __tcf_action_put()\n\n__tcf_action_put() decrements the reference count before decrementing the\nbinding count. Another thread can free the action between these operations,\ncausing the binding-count update to access freed memory. KASAN reports it\nas:\n\n  BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340\n  Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64\n\nHold the action IDR mutex across both counter updates and IDR removal,\nkeeping cleanup outside the lock."
          }
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        "id": "CVE-2026-99167",
        "lastModified": "2026-10-31T13:17:58.417",
        "metrics": {
          "cvssMetricV31": [
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              "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": "2026-10-28T11:17:37.173",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-11-05T00:25:35+00:00",
      "cve": "CVE-2026-99167",
      "id": "CVE-2026-99167",
      "initial_release_date": "2026-10-28T00:00:00+00:00",
      "product_status:known_affected": "175",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: fix use-after-free in __tcf_action_put()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99167.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
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.