Vulnerability-Lookup

GHSA-X848-X286-CCWF

Vulnerability from github – Published: 2024-11-05 18:32 – Updated: 2026-05-12 15:30

Details

In the Linux kernel, the following vulnerability has been resolved:

net: sched: fix use-after-free in taprio_change()

In 'taprio_change()', 'admin' pointer may become dangling due to sched switch / removal caused by 'advance_sched()', and critical section protected by 'q->current_entry_lock' is too small to prevent from such a scenario (which causes use-after-free detected by KASAN). Fix this by prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update 'admin' immediately before an attempt to schedule freeing.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-50127"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-05T18:15:15Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix use-after-free in taprio_change()\n\nIn \u0027taprio_change()\u0027, \u0027admin\u0027 pointer may become dangling due to sched\nswitch / removal caused by \u0027advance_sched()\u0027, and critical section\nprotected by \u0027q-\u003ecurrent_entry_lock\u0027 is too small to prevent from such\na scenario (which causes use-after-free detected by KASAN). Fix this\nby prefer \u0027rcu_replace_pointer()\u0027 over \u0027rcu_assign_pointer()\u0027 to update\n\u0027admin\u0027 immediately before an attempt to schedule freeing.",
  "id": "GHSA-x848-x286-ccwf",
  "modified": "2026-05-12T15:30:40Z",
  "published": "2024-11-05T18:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50127"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d4c0d2844e4eac3aed647f948fd7e60eea56a61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2240f9376f20f8b6463232b4ca7292569217237f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f868ce6013548a713c431c679ef73747a66fcf3"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a283a19026aaae8a773fd8061263cfa315b127f"
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      "url": "https://git.kernel.org/stable/c/999612996df28d81f163dad530d7f8026e03aec6"
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe371f084073e8672a2d7d46b335c3c060d1e301"
    },
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      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
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      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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  "severity": [
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      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-50127 (GCVE-0-2024-50127)

Vulnerability from cvelistv5 – Published: 2024-11-05 17:10 – Updated: 2026-08-05 11:41

Title

net: sched: fix use-after-free in taprio_change()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: sched: fix use-after-free in taprio_change() In 'taprio_change()', 'admin' pointer may become dangling due to sched switch / removal caused by 'advance_sched()', and critical section protected by 'q->current_entry_lock' is too small to prevent from such a scenario (which causes use-after-free detected by KASAN). Fix this by prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update 'admin' immediately before an attempt to schedule freeing.

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 2024-12-11 14:28 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root

References

10 references

URL	Tags
https://git.kernel.org/stable/c/2f868ce6013548a71…
https://git.kernel.org/stable/c/8a283a19026aaae8a…
https://git.kernel.org/stable/c/999612996df28d81f…
https://git.kernel.org/stable/c/fe371f084073e8672…
https://git.kernel.org/stable/c/0d4c0d2844e4eac3a…
https://git.kernel.org/stable/c/2240f9376f20f8b64…
https://git.kernel.org/stable/c/f504465970aebb246…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < 2f868ce6013548a713c431c679ef73747a66fcf3 (git) Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < 8a283a19026aaae8a773fd8061263cfa315b127f (git) Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < 999612996df28d81f163dad530d7f8026e03aec6 (git) Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < fe371f084073e8672a2d7d46b335c3c060d1e301 (git) Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < 0d4c0d2844e4eac3aed647f948fd7e60eea56a61 (git) Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < 2240f9376f20f8b6463232b4ca7292569217237f (git) Affected: a3d43c0d56f1b94e74963a2fbadfb70126d92213 , < f504465970aebb2467da548f7c1efbbf36d0f44b (git)
Linux	Linux	Affected: 5.2 Unaffected: 0 , < 5.2 (semver) Unaffected: 5.4.285 , ≤ 5.4.* (semver) Unaffected: 5.10.229 , ≤ 5.10.* (semver) Unaffected: 5.15.170 , ≤ 5.15.* (semver) Unaffected: 6.1.115 , ≤ 6.1.* (semver) Unaffected: 6.6.59 , ≤ 6.6.* (semver) Unaffected: 6.11.6 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	Affected: 0 , < * (custom)

Show details on NVD website

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{
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              "confidentialityImpact": "HIGH",
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              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T22:25:48.715Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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          }
        ],
        "title": "CVE Program Container"
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-12T12:00:16.499Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
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        {
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          "product": "Linux",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.285",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.11.6",
              "versionType": "semver"
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              "value": "AV:L - The vulnerability is reached through the tc/qdisc netlink configuration interface (RTM_NEWQDISC/RTM_CHANGEQDISC on the taprio qdisc), which requires local system access to open an AF_NETLINK socket. No remote packet processing path reaches taprio_change().\nAC:L - The attacker controls both sides of the race: the schedule\u0027s base-time, cycle-time and per-entry intervals determine precisely when advance_sched() fires and promotes the admin schedule, while a large gate-control list arbitrarily widens the unlocked parse window in taprio_change(). advance_sched() takes neither rtnl nor qdisc_lock, so nothing serializes it, and syzkaller reproduced the UAF by fuzzing alone.\nPR:L - tc_modify_qdisc is gated only by netlink_net_capable(skb, CAP_NET_ADMIN), which is namespace-aware, so an unprivileged user can obtain it via `unshare -Urn` and then create a multiqueue dummy/veth device to host the taprio qdisc. Per kernel scoring convention, CAP_NET_ADMIN reachable through user namespaces is Low, not High.\nUI:N - The attacker performs every step alone \u2014 creating the netns, the multiqueue device, the taprio qdisc, and issuing the two racing schedule changes. No victim action is involved.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no crossing of a hypervisor, IOMMU, or other distinct security boundary.\nC:H - Freeing the live sched_gate_list while q-\u003eoper_sched still points at it lets the attacker reclaim the kmalloc-512 allocation with a controlled object that the dequeue/dump paths then read, and the double-free plus list walk over reallocated memory yields primitives capable of arbitrary kernel memory disclosure.\nI:H - advance_sched() writes 64-bit attacker-influenced values (cycle_end_time, end_time, gate_close_time[], budgets) at known offsets into the freed objects, and taprio_free_sched_cb() later performs list_del writes and kfree() on pointers read from reallocated memory \u2014 an arbitrary-write/arbitrary-free chain suitable for privilege escalation.\nA:H - The use-after-free and subsequent double free of the operational schedule reliably corrupt the slab allocator and panic the kernel (KASAN-detected), and the attacker can trigger it repeatedly, taking down TSN-critical automotive and industrial systems where taprio is deployed."
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  "cveMetadata": {
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    "datePublished": "2024-11-05T17:10:54.385Z",
    "dateReserved": "2024-10-21T19:36:19.954Z",
    "dateUpdated": "2026-08-05T11:41:53.116Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.