CVE-2025-37914 (GCVE-0-2025-37914)

Vulnerability from cvelistv5 – Published: 2025-05-20 15:21 – Updated: 2026-08-05 11:58
VLAI
Title
net_sched: ets: Fix double list add in class with netem as child qdisc
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of ets, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 24388ba0a1b1b6d4af1b205927ac7f7b119ee4ea (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 554acc5a2ea9703e08023eb9a003f9e5a830a502 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 1f01e9f961605eb397c6ecd1d7b0233dfbf9077c (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < bc321f714de693aae06e3786f88df2975376d996 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 1a6d0c00fa07972384b0c308c72db091d49988b6 (git)
Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.182 , ≤ 5.15.* (semver)
Unaffected: 6.1.138 , ≤ 6.1.* (semver)
Unaffected: 6.6.90 , ≤ 6.6.* (semver)
Unaffected: 6.12.28 , ≤ 6.12.* (semver)
Unaffected: 6.14.6 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:L - Exploitation requires configuring an ETS qdisc with a duplicating netem child via tc/rtnetlink and then transmitting a packet, all of which are local operations. Per kernel scoring guidance, tc/netlink qdisc configuration is Local.\nAC:L - With `netem duplicate 100%` the reentrant enqueue and the resulting double `list_add_tail()` occur deterministically on the very first packet \u2014 no race, no timing window, and no dependence on memory layout the attacker cannot influence. The attacker fully controls the qdisc tree, the classifier, and the traffic.\nPR:L - Qdisc creation needs CAP_NET_ADMIN, but rtnetlink checks it via `netlink_net_capable()` against the netns\u0027s user_ns, so an unprivileged user obtains it with `unshare -Urn` and configures ETS+netem on a dummy/veth/lo device inside their own namespace. No real root is needed.\nUI:N - The attacker triggers the corruption entirely on their own by sending a packet through the qdisc they configured. No victim action is required.\nS:U - The corruption is confined to kernel memory within the same security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The double list add corrupts the `q-\u003eactive` doubly-linked list, desynchronizing the active/qlen invariant and leaving classes referencing `cl-\u003eqdisc` pointers that are freed by `qdisc_put()` before being NULLed \u2014 a use-after-free read of heap contents the attacker can groom, allowing kernel pointer and adjacent-object disclosure.\nI:H - `__list_add()` on an already-linked node performs attacker-influenced `prev-\u003enext`/`next-\u003eprev` stores, and the resulting stale-active class yields writes through a dangling `cl-\u003eqdisc` during dequeue/teardown; this is a classic list-corruption write primitive leveraged for heap grooming and control-flow hijack.\nA:H - The corrupted list causes a `CONFIG_DEBUG_LIST` `__list_add_valid()` BUG/oops, and otherwise leaves the qdisc permanently wedged \u2014 `ets_qdisc_dequeue()` returns NULL with `sch-\u003eq.qlen \u003e 0`, stalling the device\u0027s transmit path \u2014 plus NULL/dangling `cl-\u003eqdisc-\u003eops-\u003epeek()` dereferences leading to a kernel panic."
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Como se describe en el informe de Gerrard [1], existen casos de uso en los que una qdisc secundaria netem har\u00e1 que la devoluci\u00f3n de llamada de encolado de la qdisc primaria sea reentrante. En el caso de ets, no habr\u00e1 un UAF, pero el c\u00f3digo agregar\u00e1 el mismo clasificador a la lista dos veces, lo que causar\u00e1 corrupci\u00f3n de memoria. Adem\u00e1s de verificar que qlen sea cero, este parche verifica si la clase ya se agreg\u00f3 a active_list (cl_is_active) antes de realizar la adici\u00f3n para atender el caso reentrante. [1] 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:28:18+00:00",
      "cve": "CVE-2025-37914",
      "id": "CVE-2025-37914",
      "initial_release_date": "2025-05-20T00:00:00+00:00",
      "product_status:fixed": "1673",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net_sched: ets: Fix double list add in class with netem as child qdisc",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37914.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.