CVE-2024-26909 (GCVE-0-2024-26909)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-08-05 11:28
VLAI
Title
soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free A recent DRM series purporting to simplify support for "transparent bridges" and handling of probe deferrals ironically exposed a use-after-free issue on pmic_glink_altmode probe deferral. This has manifested itself as the display subsystem occasionally failing to initialise and NULL-pointer dereferences during boot of machines like the Lenovo ThinkPad X13s. Specifically, the dp-hpd bridge is currently registered before all resources have been acquired which means that it can also be deregistered on probe deferrals. In the meantime there is a race window where the new aux bridge driver (or PHY driver previously) may have looked up the dp-hpd bridge and stored a (non-reference-counted) pointer to the bridge which is about to be deallocated. When the display controller is later initialised, this triggers a use-after-free when attaching the bridges: dp -> aux -> dp-hpd (freed) which may, for example, result in the freed bridge failing to attach: [drm:drm_bridge_attach [drm]] *ERROR* failed to attach bridge /soc@0/phy@88eb000 to encoder TMDS-31: -16 or a NULL-pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 ... Call trace: drm_bridge_attach+0x70/0x1a8 [drm] drm_aux_bridge_attach+0x24/0x38 [aux_bridge] drm_bridge_attach+0x80/0x1a8 [drm] dp_bridge_init+0xa8/0x15c [msm] msm_dp_modeset_init+0x28/0xc4 [msm] The DRM bridge implementation is clearly fragile and implicitly built on the assumption that bridges may never go away. In this case, the fix is to move the bridge registration in the pmic_glink_altmode driver to after all resources have been looked up. Incidentally, with the new dp-hpd bridge implementation, which registers child devices, this is also a requirement due to a long-standing issue in driver core that can otherwise lead to a probe deferral loop (see commit fbc35b45f9f6 ("Add documentation on meaning of -EPROBE_DEFER")). [DB: slightly fixed commit message by adding the word 'commit']
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-15 19:23 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 080b4e24852b1d5b66929f69344e6c3eeb963941 , < 2bbd65c6ca567ed8dbbfc4fb945f57ce64bef342 (git)
Affected: 080b4e24852b1d5b66929f69344e6c3eeb963941 , < ef45aa2841e15b649e5417fe3d4de395fe462781 (git)
Affected: 080b4e24852b1d5b66929f69344e6c3eeb963941 , < b979f2d50a099f3402418d7ff5f26c3952fb08bb (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The vulnerable code is a Qualcomm SoC auxiliary-bus driver reached only through in-kernel device probing on the local machine; there is no network, adjacent-network, or remote-peer data path to `pmic_glink_altmode_probe()` or the DRM bridge chain. Local presence on the affected Qualcomm platform is the most severe reasonable vector.\nAC:H - The use-after-free only manifests when the altmode probe hits `-EPROBE_DEFER` after another driver has already cached the dp-hpd bridge pointer \u2014 a boot-time driver load/probe-ordering window the attacker cannot influence from either side, which is why the commit reports it failing only \"occasionally\". It is additionally confined to specific Qualcomm SoC hardware with `CONFIG_QCOM_PMIC_GLINK` altmode support.\nPR:L - There is no unauthenticated entry point, so PR:N is not defensible; conversely the flaw fires spontaneously during boot without any privileged action, so the low-privilege local floor is the appropriate and higher-severity choice over PR:H.\nUI:N - The condition arises autonomously during kernel device probing and display-subsystem initialisation at boot; no victim must open a file, mount media, or plug in a cable for the stale bridge pointer to be dereferenced.\nS:U - The freed object, the dangling pointer, and the corrupted control flow all live in kernel address space under the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free: `drm_bridge_attach()` reads `bridge-\u003edev`, `bridge-\u003eof_node`, and the entire `bridge-\u003efuncs` table out of the freed `drm_aux_hpd_bridge_data` slab object, so reallocated heap contents are read back and can be leveraged for disclosure of kernel memory.\nI:H - The same path writes into freed memory (`bridge-\u003edev`, `bridge-\u003eencoder`, and a `list_add()` on `bridge-\u003echain_node`, which also corrupts adjacent list pointers) and then performs an indirect call through `bridge-\u003efuncs-\u003eattach` read from that freed allocation \u2014 a control-flow-hijack primitive if the slab object is reallocated.\nA:H - The commit documents a reproducible kernel oops \u2014 \"Unable to handle kernel NULL pointer dereference\" with a `drm_bridge_attach`/`drm_aux_bridge_attach` call trace \u2014 plus outright failure of the display subsystem to initialise, both of which are High availability impact."
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          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free Una serie reciente de DRM que pretende simplificar el soporte para \"puentes transparentes\" y el manejo de aplazamientos de sonda expuso ir\u00f3nicamente un uso posterior -Problema gratuito en el aplazamiento de la sonda pmic_glink_altmode. Esto se ha manifestado como que el subsistema de visualizaci\u00f3n ocasionalmente falla al inicializarse y se eliminan las referencias del puntero NULL durante el arranque de m\u00e1quinas como la Lenovo ThinkPad X13s. Espec\u00edficamente, el puente dp-hpd actualmente est\u00e1 registrado antes de que se hayan adquirido todos los recursos, lo que significa que tambi\u00e9n se puede cancelar su registro en caso de aplazamientos de sonda. Mientras tanto, hay una ventana de carrera donde el nuevo controlador del puente auxiliar (o el controlador PHY anteriormente) puede haber buscado el puente dp-hpd y almacenado un puntero (sin recuento de referencias) al puente que est\u00e1 a punto de ser desasignado. Cuando el controlador de pantalla se inicializa posteriormente, esto activa un use-after-free al conectar los puentes: dp -\u0026gt; aux -\u0026gt; dp-hpd (liberado) que puede, por ejemplo, provocar que el puente liberado no se pueda conectar: [drm :drm_bridge_attach [drm]] *ERROR* no se pudo adjuntar el puente /soc@0/phy@88eb000 al codificador TMDS-31: -16 o una desreferencia de puntero NULL: no se puede manejar la desreferencia de puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000000... Seguimiento de llamadas: drm_bridge_attach+0x70/0x1a8 [drm] drm_aux_bridge_attach+0x24/0x38 [aux_bridge] drm_bridge_attach+0x80/0x1a8 [drm] dp_bridge_init+0xa8/0x15c [msm] msm_dp_modeset_init+0x28/0xc4 [msm] El puente DRM la implementaci\u00f3n es claramente fr\u00e1gil e impl\u00edcitamente construido sobre el supuesto de que es posible que los puentes nunca desaparezcan. En este caso, la soluci\u00f3n es mover el registro del puente en el controlador pmic_glink_altmode despu\u00e9s de que se hayan buscado todos los recursos. Por cierto, con la nueva implementaci\u00f3n del puente dp-hpd, que registra dispositivos secundarios, esto tambi\u00e9n es un requisito debido a un problema de larga data en el n\u00facleo del controlador que, de lo contrario, puede provocar un bucle de aplazamiento de la sonda (consulte el compromiso fbc35b45f9f6 (\"Agregar documentaci\u00f3n sobre el significado de -EPROBE_DEFER\")). [DB: mensaje de confirmaci\u00f3n ligeramente corregido agregando la palabra \u0027compromiso\u0027]"
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free Una serie reciente de DRM que pretende simplificar el soporte para \"puentes transparentes\" y el manejo de aplazamientos de sonda expuso ir\u00f3nicamente un uso posterior -Problema gratuito en el aplazamiento de la sonda pmic_glink_altmode. Esto se ha manifestado como que el subsistema de visualizaci\u00f3n ocasionalmente falla al inicializarse y se eliminan las referencias del puntero NULL durante el arranque de m\u00e1quinas como la Lenovo ThinkPad X13s. Espec\u00edficamente, el puente dp-hpd actualmente est\u00e1 registrado antes de que se hayan adquirido todos los recursos, lo que significa que tambi\u00e9n se puede cancelar su registro en caso de aplazamientos de sonda. Mientras tanto, hay una ventana de carrera donde el nuevo controlador del puente auxiliar (o el controlador PHY anteriormente) puede haber buscado el puente dp-hpd y almacenado un puntero (sin recuento de referencias) al puente que est\u00e1 a punto de ser desasignado. Cuando el controlador de pantalla se inicializa posteriormente, esto activa un use-after-free al conectar los puentes: dp -\u0026gt; aux -\u0026gt; dp-hpd (liberado) que puede, por ejemplo, provocar que el puente liberado no se pueda conectar: [drm :drm_bridge_attach [drm]] *ERROR* no se pudo adjuntar el puente /soc@0/phy@88eb000 al codificador TMDS-31: -16 o una desreferencia de puntero NULL: no se puede manejar la desreferencia de puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000000... Seguimiento de llamadas: drm_bridge_attach+0x70/0x1a8 [drm] drm_aux_bridge_attach+0x24/0x38 [aux_bridge] drm_bridge_attach+0x80/0x1a8 [drm] dp_bridge_init+0xa8/0x15c [msm] msm_dp_modeset_init+0x28/0xc4 [msm] El puente DRM la implementaci\u00f3n es claramente fr\u00e1gil e impl\u00edcitamente construido sobre el supuesto de que es posible que los puentes nunca desaparezcan. En este caso, la soluci\u00f3n es mover el registro del puente en el controlador pmic_glink_altmode despu\u00e9s de que se hayan buscado todos los recursos. Por cierto, con la nueva implementaci\u00f3n del puente dp-hpd, que registra dispositivos secundarios, esto tambi\u00e9n es un requisito debido a un problema de larga data en el n\u00facleo del controlador que, de lo contrario, puede provocar un bucle de aplazamiento de la sonda (consulte el compromiso fbc35b45f9f6 (\"Agregar documentaci\u00f3n sobre el significado de -EPROBE_DEFER\")). [DB: mensaje de confirmaci\u00f3n ligeramente corregido agregando la palabra \u0027compromiso\u0027]"
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          "title": "soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26909",
        "datePublished": "2024-04-17T10:27:55.462Z",
        "dateReserved": "2024-02-19T14:20:24.188Z",
        "dateUpdated": "2026-08-05T11:28:14.867Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.



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.