CVE-2024-27005 (GCVE-0-2024-27005)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:28 – Updated: 2026-08-05 11:28
VLAI
Title
interconnect: Don't access req_list while it's being manipulated
Summary
In the Linux kernel, the following vulnerability has been resolved: interconnect: Don't access req_list while it's being manipulated The icc_lock mutex was split into separate icc_lock and icc_bw_lock mutexes in [1] to avoid lockdep splats. However, this didn't adequately protect access to icc_node::req_list. The icc_set_bw() function will eventually iterate over req_list while only holding icc_bw_lock, but req_list can be modified while only holding icc_lock. This causes races between icc_set_bw(), of_icc_get(), and icc_put(). Example A: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); icc_put(path_b) mutex_lock(&icc_lock); aggregate_requests() hlist_for_each_entry(r, ... hlist_del(... <r = invalid pointer> Example B: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); path_b = of_icc_get() of_icc_get_by_index() mutex_lock(&icc_lock); path_find() path_init() aggregate_requests() hlist_for_each_entry(r, ... hlist_add_head(... <r = invalid pointer> Fix this by ensuring icc_bw_lock is always held before manipulating icc_node::req_list. The additional places icc_bw_lock is held don't perform any memory allocations, so we should still be safe from the original lockdep splats that motivated the separate locks. [1] commit af42269c3523 ("interconnect: Fix locking for runpm vs reclaim")
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-06 18:46 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6619 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9be2957f014d91088db1eb5dd09d9a03d7184dce , < fe549d8e976300d0dd75bd904eb216bed8b145e0 (git)
Affected: ee42bfc791aa3cd78e29046f26a09d189beb3efb , < 19ec82b3cad1abef2a929262b8c1528f4e0c192d (git)
Affected: af42269c3523492d71ebbe11fefae2653e9cdc78 , < d0d04efa2e367921654b5106cc5c05e3757c2b42 (git)
Affected: af42269c3523492d71ebbe11fefae2653e9cdc78 , < 4c65507121ea8e0b47fae6d2049c8688390d46b6 (git)
Affected: af42269c3523492d71ebbe11fefae2653e9cdc78 , < de1bf25b6d771abdb52d43546cf57ad775fb68a1 (git)
Affected: 2f3a124696d43de3c837f87a9f767c56ee86cf2a (git)
Affected: 5.15.133 , < 5.15.151 (semver)
Affected: 6.1.55 , < 6.1.81 (semver)
Affected: 6.5.5 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 5.15.151 , ≤ 5.15.* (semver)
Unaffected: 6.1.81 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: interconexi\u00f3n: no acceder a req_list mientras se est\u00e1 manipulando. El mutex icc_lock se dividi\u00f3 en mutex icc_lock e icc_bw_lock separados en [1] para evitar s\u00edmbolos de bloqueo. Sin embargo, esto no protegi\u00f3 adecuadamente el acceso a icc_node::req_list. La funci\u00f3n icc_set_bw() eventualmente iterar\u00e1 sobre req_list mientras solo mantiene icc_bw_lock, pero req_list se puede modificar mientras solo mantiene icc_lock. Esto provoca ejecuci\u00f3ns entre icc_set_bw(), of_icc_get() e icc_put(). Ejemplo A: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(\u0026amp;icc_bw_lock); icc_put(ruta_b) mutex_lock(\u0026amp;icc_lock); agregado_requests() hlist_for_each_entry(r, ... hlist_del(...  Ejemplo B: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(\u0026amp;icc_bw_lock); path_b = of_icc_get() of_icc_get_by_index( ) mutex_lock(\u0026amp;icc_lock); path_find() path_init() agregado_requests() hlist_for_each_entry(r, ... hlist_add_head(...  Solucione este problema asegur\u00e1ndose de que icc_bw_lock siempre se mantenga antes de manipular icc_node::req_list. El adicional Los lugares donde se mantiene icc_bw_lock no realizan ninguna asignaci\u00f3n de memoria, por lo que a\u00fan deber\u00edamos estar a salvo de los s\u00edmbolos de bloqueo originales que motivaron los bloqueos separados [1] commit af42269c3523 (\"interconexi\u00f3n: arreglar el bloqueo para runpm vs reclaim\")"
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                  "value": "AV:L - The interconnect framework is reached only through local syscall paths \u2014 V4L2 ioctls on /dev/videoN (venus), DRM render-node submissions driving GPU devfreq, block I/O driving UFS/eMMC clock scaling \u2014 all of which require local access to the device. No network-facing protocol handler reaches `icc_set_bw()` or `icc_put()`.\nAC:L - The attacker directly controls the reading side of the race and can spin it in a tight loop (repeated `VIDIOC_STREAMON`/`STREAMOFF` on /dev/videoN, or continuous GPU/IO load forcing OPP bandwidth transitions), so the `req_list` walk in `aggregate_requests()` can be issued arbitrarily often against recurring `path_init()`/`icc_put()` mutations, with unlimited retries and no condition outside the attacker\u0027s influence gating success.\nPR:L - An ordinary unprivileged local account suffices \u2014 access to /dev/videoN (video/media group, or any app on Android), /dev/dri/renderD128, or simply generating filesystem I/O is enough to drive `icc_set_bw()` into `aggregate_requests()`. No capability, root, or namespace privilege is required.\nUI:N - The attacker\u0027s own process triggers both the bandwidth-vote storm and the racing condition entirely on its own. No victim action, no file to open, no filesystem to mount.\nS:U - The corruption is confined to kernel heap objects and interconnect provider state within the same kernel security authority. There is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The list walk continues through a `kfree()`d `struct icc_path` from a general-purpose kmalloc cache, so a sprayed `req_node.next` steers subsequent iterations to arbitrary kernel addresses, reading `enabled`/`tag`/`avg_bw`/`peak_bw` from them; those values surface in `node-\u003eavg_bw`/`peak_bw`, giving a use-after-free based arbitrary-read primitive.\nI:H - This is a use-after-free plus hlist corruption on a `GFP_KERNEL` kmalloc object, which is a standard heap-spray and write-primitive foundation; concretely, garbage read from freed memory is aggregated into `node-\u003eavg_bw`/`peak_bw` and programmed into interconnect hardware through `apply_constraints()` \u2192 `p-\u003eset()`, corrupting system bus configuration.\nA:H - `icc_put()` uses `hlist_del()` (leaving `LIST_POISON1` in `next`) immediately followed by `kfree(path)`, so a racing `hlist_for_each_entry()` dereferences a poison or dangling pointer and oopses/panics the kernel; `hlist_add_head()` racing the same walk can likewise send it into a corrupted chain."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:28:55.925Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/fe549d8e976300d0dd75bd904eb216bed8b145e0"
            },
            {
              "url": "https://git.kernel.org/stable/c/19ec82b3cad1abef2a929262b8c1528f4e0c192d"
            },
            {
              "url": "https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42"
            },
            {
              "url": "https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c8688390d46b6"
            },
            {
              "url": "https://git.kernel.org/stable/c/de1bf25b6d771abdb52d43546cf57ad775fb68a1"
            }
          ],
          "title": "interconnect: Don\u0027t access req_list while it\u0027s being manipulated",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-27005",
        "datePublished": "2024-05-01T05:28:59.193Z",
        "dateReserved": "2024-02-19T14:20:24.207Z",
        "dateUpdated": "2026-08-05T11:28:55.925Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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