CVE-2024-26623 (GCVE-0-2024-26623)

Vulnerability from cvelistv5 – Published: 2024-03-06 06:45 – Updated: 2026-08-05 11:26
VLAI
Title
pds_core: Prevent race issues involving the adminq
Summary
In the Linux kernel, the following vulnerability has been resolved: pds_core: Prevent race issues involving the adminq There are multiple paths that can result in using the pdsc's adminq. [1] pdsc_adminq_isr and the resulting work from queue_work(), i.e. pdsc_work_thread()->pdsc_process_adminq() [2] pdsc_adminq_post() When the device goes through reset via PCIe reset and/or a fw_down/fw_up cycle due to bad PCIe state or bad device state the adminq is destroyed and recreated. A NULL pointer dereference can happen if [1] or [2] happens after the adminq is already destroyed. In order to fix this, add some further state checks and implement reference counting for adminq uses. Reference counting was used because multiple threads can attempt to access the adminq at the same time via [1] or [2]. Additionally, multiple clients (i.e. pds-vfio-pci) can be using [2] at the same time. The adminq_refcnt is initialized to 1 when the adminq has been allocated and is ready to use. Users/clients of the adminq (i.e. [1] and [2]) will increment the refcnt when they are using the adminq. When the driver goes into a fw_down cycle it will set the PDSC_S_FW_DEAD bit and then wait for the adminq_refcnt to hit 1. Setting the PDSC_S_FW_DEAD before waiting will prevent any further adminq_refcnt increments. Waiting for the adminq_refcnt to hit 1 allows for any current users of the adminq to finish before the driver frees the adminq. Once the adminq_refcnt hits 1 the driver clears the refcnt to signify that the adminq is deleted and cannot be used. On the fw_up cycle the driver will once again initialize the adminq_refcnt to 1 allowing the adminq to be used again.
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: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-06 14:15 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 01ba61b55b2041a39c54aefb3153c770dd59a0ef , < 22cd6046eb2148b18990257505834dd45c672a1b (git)
Affected: 01ba61b55b2041a39c54aefb3153c770dd59a0ef , < 5939feb63ea1f011027576c64b68b681cbad31ca (git)
Affected: 01ba61b55b2041a39c54aefb3153c770dd59a0ef , < 7e82a8745b951b1e794cc780d46f3fbee5e93447 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.16 , ≤ 6.6.* (semver)
Unaffected: 6.7.4 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: pds_core: evita problemas de ejecuci\u00f3n relacionados con adminq. Hay varias rutas que pueden resultar en el uso de adminq de pdsc. [1] pdsc_adminq_isr y el trabajo resultante de queue_work(), es decir, pdsc_work_thread()-\u0026gt;pdsc_process_adminq() [2] pdsc_adminq_post() Cuando el dispositivo se reinicia mediante reinicio de PCIe y/o un ciclo fw_down/fw_up debido a un estado incorrecto de PCIe o mal estado del dispositivo, adminq se destruye y se vuelve a crear. Puede ocurrir una desreferencia de puntero NULL si [1] o [2] ocurre despu\u00e9s de que adminq ya est\u00e9 destruido. Para solucionar este problema, agregue algunas comprobaciones de estado adicionales e implemente el recuento de referencias para usos de adminq. Se utiliz\u00f3 el recuento de referencias porque varios subprocesos pueden intentar acceder a adminq al mismo tiempo a trav\u00e9s de [1] o [2]. Adem\u00e1s, varios clientes (es decir, pds-vfio-pci) pueden utilizar [2] al mismo tiempo. adminq_refcnt se inicializa en 1 cuando adminq se ha asignado y est\u00e1 listo para usar. Los usuarios/clientes de adminq (es decir, [1] y [2]) incrementar\u00e1n el refcnt cuando utilicen adminq. Cuando el controlador entra en un ciclo fw_down, establecer\u00e1 el bit PDSC_S_FW_DEAD y luego esperar\u00e1 a que adminq_refcnt llegue a 1. Configurar PDSC_S_FW_DEAD antes de esperar evitar\u00e1 m\u00e1s incrementos de adminq_refcnt. Esperar a que adminq_refcnt llegue a 1 permite que cualquier usuario actual de adminq finalice antes de que el controlador libere adminq. Una vez que adminq_refcnt llega a 1, el controlador borra el refcnt para indicar que adminq se elimina y no se puede utilizar. En el ciclo fw_up, el controlador inicializar\u00e1 una vez m\u00e1s adminq_refcnt en 1, lo que permitir\u00e1 utilizar adminq nuevamente."
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:13:36+00:00",
      "cve": "CVE-2024-26623",
      "id": "CVE-2024-26623",
      "initial_release_date": "2024-03-06T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: pds_core: Prevent race issues involving the adminq",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26623.json",
      "version": "3"
    },
    "vulnrichment": {
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            "providerMetadata": {
              "dateUpdated": "2024-08-02T00:07:19.860Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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                "url": "https://git.kernel.org/stable/c/5939feb63ea1f011027576c64b68b681cbad31ca"
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                "url": "https://git.kernel.org/stable/c/7e82a8745b951b1e794cc780d46f3fbee5e93447"
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            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-26623",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-03-06T14:15:26.675181Z",
                    "version": "2.0.3"
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              "dateUpdated": "2024-05-23T19:01:10.765Z",
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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          "affected": [
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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                "drivers/net/ethernet/amd/pds_core/core.c",
                "drivers/net/ethernet/amd/pds_core/core.h"
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                "drivers/net/ethernet/amd/pds_core/core.c",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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                  "version": "6.4"
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                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.16",
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                },
                {
                  "lessThanOrEqual": "6.7.*",
                  "status": "unaffected",
                  "version": "6.7.4",
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                {
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                  "version": "6.8",
                  "versionType": "original_commit_for_fix"
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            }
          ],
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                      "versionEndExcluding": "6.6.16",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7.4",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
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                      "versionEndExcluding": "6.8",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
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              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: Prevent race issues involving the adminq\n\nThere are multiple paths that can result in using the pdsc\u0027s\nadminq.\n\n[1] pdsc_adminq_isr and the resulting work from queue_work(),\n    i.e. pdsc_work_thread()-\u003epdsc_process_adminq()\n\n[2] pdsc_adminq_post()\n\nWhen the device goes through reset via PCIe reset and/or\na fw_down/fw_up cycle due to bad PCIe state or bad device\nstate the adminq is destroyed and recreated.\n\nA NULL pointer dereference can happen if [1] or [2] happens\nafter the adminq is already destroyed.\n\nIn order to fix this, add some further state checks and\nimplement reference counting for adminq uses. Reference\ncounting was used because multiple threads can attempt to\naccess the adminq at the same time via [1] or [2]. Additionally,\nmultiple clients (i.e. pds-vfio-pci) can be using [2]\nat the same time.\n\nThe adminq_refcnt is initialized to 1 when the adminq has been\nallocated and is ready to use. Users/clients of the adminq\n(i.e. [1] and [2]) will increment the refcnt when they are using\nthe adminq. When the driver goes into a fw_down cycle it will\nset the PDSC_S_FW_DEAD bit and then wait for the adminq_refcnt\nto hit 1. Setting the PDSC_S_FW_DEAD before waiting will prevent\nany further adminq_refcnt increments. Waiting for the\nadminq_refcnt to hit 1 allows for any current users of the adminq\nto finish before the driver frees the adminq. Once the\nadminq_refcnt hits 1 the driver clears the refcnt to signify that\nthe adminq is deleted and cannot be used. On the fw_up cycle the\ndriver will once again initialize the adminq_refcnt to 1 allowing\nthe adminq to be used again."
            }
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                "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 - The adminq is driven from local interfaces only \u2014 vhost-vdpa ioctls via drivers/vdpa/pds, VFIO migration commands via drivers/vfio/pci/pds/cmds.c, and devlink/PCI reset paths; no remote peer data reaches this code.\nAC:L - A local attacker controls one side of the race directly (unbounded concurrent pdsc_adminq_post() calls from multiple client threads) and can influence the teardown side, since command timeouts/ENXIO queue health_work and a VFIO/vDPA holder can induce device resets, so the window is repeatedly retryable at will.\nPR:L - An unprivileged local user holding a vhost-vdpa or VFIO device fd \u2014 a normal delegation to a VMM or container in cloud/virtualization deployments where these AMD Pensando cards are used \u2014 can post adminq commands; no root or init-namespace capability is required.\nUI:N - Exploitation only requires the attacker\u0027s own concurrent adminq activity across a firmware-recovery or PCIe reset cycle; no victim action is involved.\nS:U - The corruption and crash occur in the host kernel that owns the driver; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Racing pdsc_process_notifyq()/pdsc_process_adminq() read cq-\u003einfo and the completion buffer after vfree()/dma_free_coherent(), so freed and potentially reallocated kernel memory is read and its contents propagated to client drivers through pdsc_notify(), giving a use-after-free read primitive.\nI:H - __pdsc_adminq_post() writes q_info-\u003ewc, q_info-\u003edest and a 64-byte partly attacker-controlled memcpy into vfree\u0027d descriptor memory and freed DMA-coherent pages, and pdsc_process_adminq() calls complete_all() through a pointer taken from freed memory \u2014 a use-after-free write usable for heap grooming and control-flow corruption.\nA:H - The commit states a NULL pointer dereference occurs when the adminq is used after destruction; additionally intr_ctrl/info_regs are dereferenced after iounmap and kern_dbpage is NULL, each producing a kernel oops or panic."
                }
              ]
            }
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26623",
        "datePublished": "2024-03-06T06:45:32.278Z",
        "dateReserved": "2024-02-19T14:20:24.134Z",
        "dateUpdated": "2026-08-05T11:26:20.441Z",
        "state": "PUBLISHED"
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}



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



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