CVE-2024-50059 (GCVE-0-2024-50059)

Vulnerability from cvelistv5 – Published: 2024-10-21 19:39 – Updated: 2026-08-05 11:41
VLAI
Title
ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition
Summary
In the Linux kernel, the following vulnerability has been resolved: ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition In the switchtec_ntb_add function, it can call switchtec_ntb_init_sndev function, then &sndev->check_link_status_work is bound with check_link_status_work. switchtec_ntb_link_notification may be called to start the work. If we remove the module which will call switchtec_ntb_remove to make cleanup, it will free sndev through kfree(sndev), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | check_link_status_work switchtec_ntb_remove | kfree(sndev); | | if (sndev->link_force_down) | // use sndev Fix it by ensuring that the work is canceled before proceeding with the cleanup in switchtec_ntb_remove.
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 2024-10-22 13:23 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < 5126d8f5567f49b52e21fca320eaa97977055099 (git)
Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < b650189687822b705711f0567a65a164a314d8df (git)
Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < 92728fceefdaa2a0a3aae675f86193b006eeaa43 (git)
Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < 3ae45be8492460a35b5aebf6acac1f1d32708946 (git)
Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < fa840ba4bd9f3bad7f104e5b32028ee73af8b3dd (git)
Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < 177925d9c8715a897bb79eca62628862213ba956 (git)
Affected: d04be142b8b61ffb3c9cc5c6d1abda8fc59a16c9 , < e51aded92d42784313ba16c12f4f88cc4f973bbb (git)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.57 , ≤ 6.6.* (semver)
Unaffected: 6.11.4 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The freeing side of the race is driver teardown, entered only through local actions \u2014 `rmmod ntb_hw_switchtec`, a write to `/sys/bus/pci/drivers/switchtec/unbind`, or `/sys/bus/pci/devices/.../remove` \u2014 and the racing side arrives over the PCIe/NTB fabric rather than a network stack. No network or adjacent-network protocol reaches this code, so local system access is the entry point.\nAC:L - The attacker controls both sides: the NTB peer host (or a local user driving the Switchtec management device) can send `LINK_MESSAGE`/`MSG_LINK_FORCE_DOWN` continuously so `check_link_status_work` is always pending, and `switchtec_ntb_part_op()` then sleeps up to 1000\u00d750 ms inside the object, holding the window open for tens of seconds while teardown is triggered. Bind/unbind can also be repeated indefinitely, so success depends on nothing outside the attacker\u0027s influence.\nPR:L - The side that keeps the work item live requires no privilege \u2014 it is driven by the NTB peer host\u0027s link messages, by PCIe link-state events, or by non-CAP_SYS_ADMIN MRPC commands on `/dev/switchtecN` (the driver explicitly gates only GAS read/write on CAP_SYS_ADMIN) \u2014 while the `kfree()` occurs on any device removal, including surprise PCIe hot-remove and routine administrative unbind. Consistent with the scoring of the equivalent driver remove-path work-item UAFs (e.g. CVE-2024-57984), low local privileges are the defensible assumption.\nUI:N - The removal and the link-message traffic are both initiated by the attacker or generated autonomously by the PCIe hardware; no victim must mount a filesystem, open a file, or take any other action. Exploitation completes entirely from the attacker\u0027s own operations.\nS:U - The use-after-free corrupts kernel heap state and is exploited within the same kernel security authority that owns the driver. No hypervisor, IOMMU, or sandbox boundary is crossed by the vulnerability itself.\nC:H - After `kfree(sndev)` the worker reads `link_force_down`, `mmio_ntb`, `mmio_peer_ctrl`, `mmio_peer_dbmsg`, `self_shared_dma`, `peer_direct_mw_to_bar[]` and `stdev-\u003edev` back out of freed memory, and the ~50-second sleep inside `switchtec_ntb_part_op()` makes slab reclaim by an attacker-sprayed object highly practical, converting the dangling object into a controlled kernel read primitive. Per use-after-free scoring guidance this is High.\nI:H - `ntb_link_event()` performs `ntb-\u003ectx_ops-\u003elink_event(ntb-\u003ectx)` \u2014 an indirect branch through a function pointer read from freed memory \u2014 and `config_rsvd_lut_win()` issues `iowrite32`/`iowrite64` to `\u0026ctl-\u003ebar_entry[peer_bar]`/`\u0026ctl-\u003elut_entry[]` with base pointer, index and payload all taken from the freed object, giving both control-flow hijack and a controlled write (including reprogramming of the NTB DMA translation window) after heap spraying.\nA:H - Even without successful exploitation, the worker takes a spinlock in freed memory, dereferences freed `__iomem` pointers and touches the device after teardown, and the concurrent `link_notifier`/`sndev` NULL stores add a NULL-pointer dereference path \u2014 any of which produces a kernel oops or panic."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition\n\nIn the switchtec_ntb_add function, it can call switchtec_ntb_init_sndev\nfunction, then \u0026sndev-\u003echeck_link_status_work is bound with\ncheck_link_status_work. switchtec_ntb_link_notification may be called\nto start the work.\n\nIf we remove the module which will call switchtec_ntb_remove to make\ncleanup, it will free sndev through kfree(sndev), while the work\nmentioned above will be used. The sequence of operations that may lead\nto a UAF bug is as follows:\n\nCPU0                                 CPU1\n\n                        | check_link_status_work\nswitchtec_ntb_remove    |\nkfree(sndev);           |\n                        | if (sndev-\u003elink_force_down)\n                        | // use sndev\n\nFix it by ensuring that the work is canceled before proceeding with\nthe cleanup in switchtec_ntb_remove."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ntb: ntb_hw_switchtec: Se corrige la vulnerabilidad de use after free en switchtec_ntb_remove debido a la condici\u00f3n de ejecuci\u00f3n En la funci\u00f3n switchtec_ntb_add, puede llamar a la funci\u00f3n switchtec_ntb_init_sndev, luego \u0026amp;sndev-\u0026gt;check_link_status_work se vincula con check_link_status_work. Se puede llamar a switchtec_ntb_link_notification para iniciar el trabajo. Si eliminamos el m\u00f3dulo que llamar\u00e1 a switchtec_ntb_remove para realizar la limpieza, liberar\u00e1 sndev a trav\u00e9s de kfree(sndev), mientras que se utilizar\u00e1 el trabajo mencionado anteriormente. La secuencia de operaciones que puede llevar a un error de UAF es la siguiente: CPU0 CPU1 | check_link_status_work switchtec_ntb_remove | kfree(sndev); | | if (sndev-\u0026gt;link_force_down) | // use sndev Arr\u00e9glelo asegur\u00e1ndose de que el trabajo se cancele antes de continuar con la limpieza en switchtec_ntb_remove."
          }
        ],
        "id": "CVE-2024-50059",
        "lastModified": "2026-08-04T11:21:13.347",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition",
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition\n\nIn the switchtec_ntb_add function, it can call switchtec_ntb_init_sndev\nfunction, then \u0026sndev-\u003echeck_link_status_work is bound with\ncheck_link_status_work. switchtec_ntb_link_notification may be called\nto start the work.\n\nIf we remove the module which will call switchtec_ntb_remove to make\ncleanup, it will free sndev through kfree(sndev), while the work\nmentioned above will be used. The sequence of operations that may lead\nto a UAF bug is as follows:\n\nCPU0                                 CPU1\n\n                        | check_link_status_work\nswitchtec_ntb_remove    |\nkfree(sndev);           |\n                        | if (sndev-\u003elink_force_down)\n                        | // use sndev\n\nFix it by ensuring that the work is canceled before proceeding with\nthe cleanup in switchtec_ntb_remove."
            }
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        "dateReserved": "2024-10-21T19:36:19.939Z",
        "dateUpdated": "2026-01-05T10:54:57.871Z",
        "state": "PUBLISHED"
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  }
}



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