CVE-2024-56603 (GCVE-0-2024-56603)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-08-05 11:45
VLAI
Title
net: af_can: do not leave a dangling sk pointer in can_create()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: af_can: do not leave a dangling sk pointer in can_create() On error can_create() frees the allocated sk object, but sock_init_data() has already attached it to the provided sock object. This will leave a dangling sk pointer in the sock object and may cause use-after-free later.
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: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-11 15:42 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < 884ae8bcee749be43a071d6ed2d89058dbd2425c (git)
Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < ce39b5576785bb3e66591145aad03d66bc3e778d (git)
Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < 1fe625f12d090d69f3f084990c7e4c1ff94bfe5f (git)
Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < 5947c9ac08f0771ea8ed64186b0d52e9029cb6c0 (git)
Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < db207d19adbac96058685f6257720906ad41d215 (git)
Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < 8df832e6b945e1ba61467d7f1c9305e314ae92fe (git)
Affected: 0d66548a10cbbe0ef256852d63d30603f0f73f9b , < 811a7ca7320c062e15d0f5b171fe6ad8592d1434 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The defect lives in the `socket(AF_CAN, SOCK_RAW, CAN_RAW)` creation path, reached only through a local syscall via `__sock_create()`; no CAN-bus frame or network data reaches `can_create()`. Consistent with the Bluetooth and af_packet siblings in the same series, which were also scored AV:L because the flaw is in socket setup rather than frame processing.\nAC:L - The only failing `-\u003einit` is `raw_init()`\u0027s `alloc_percpu(struct uniqframe)` returning `-ENOMEM`, and an unprivileged local attacker can drive the percpu allocator into failure by spraying percpu-consuming objects (including CAN raw sockets themselves) before retrying `socket()` in a tight loop. This is the same attacker-induced-ENOMEM shape as the af_packet sibling CVE-2024-56606, which was scored AC:L.\nPR:L - `can_create()` performs no `capable()` check at all \u2014 unlike af_packet there is no `CAP_NET_RAW` gate \u2014 and there is no `net_eq(net, \u0026init_net)` restriction, so any unprivileged local user, including inside an unprivileged user namespace, can reach it. Where `CONFIG_CAN` is modular, `MODULE_ALIAS_NETPROTO(PF_CAN)` lets the unprivileged `socket()` call autoload the module itself.\nUI:N - The attacker performs the entire sequence \u2014 memory pressure plus repeated `socket()` calls \u2014 from its own process. No victim action, mount, or file open is involved.\nS:U - The freed `struct raw_sock`/`struct sock` and the stale `sock-\u003esk` reference both live entirely within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Per the use-after-free rubric, the stale `sock-\u003esk` pointing at a freed `raw_sock` in the general kmalloc caches lets an attacker reclaim the slab and read back attacker-shaped or leftover kernel data; the demonstrated consumer for this exact bug class (CVE-2024-40954) is a KASAN-confirmed slab-use-after-free *read* of the freed sock via `__sock_gen_cookie()`.\nI:H - The same dangling reference permits heap spraying of the reclaimed slot, giving control over function-pointer-bearing fields of `struct sock` (`sk_prot`, `sk_destruct`, `sk_wq`) and therefore a control-flow-hijack primitive rather than mere data corruption.\nA:H - Any dereference of the freed `sock-\u003esk` before `iput()` faults or corrupts kernel state, producing an oops or panic; the rubric treats all use-after-free conditions as high availability impact even when only partially exploited."
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    "datePublished": "2024-12-27T14:51:08.923Z",
    "dateReserved": "2024-12-27T14:03:06.012Z",
    "dateUpdated": "2026-08-05T11:45:23.876Z",
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      "date": "2026-10-06",
      "epss": "0.00238",
      "percentile": "0.13531"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_can: do not leave a dangling sk pointer in can_create()\n\nOn error can_create() frees the allocated sk object, but sock_init_data()\nhas already attached it to the provided sock object. This will leave a\ndangling sk pointer in the sock object and may cause use-after-free later."
        },
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          "lang": "es",
          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: af_can: no deje un puntero sk colgando en can_create() En caso de error, can_create() libera el objeto sk asignado, pero sock_init_data() ya lo ha adjuntado al objeto sock proporcionado. Esto dejar\u00e1 un puntero sk colgando en el objeto sock y puede provocar un uso posterior a la liberaci\u00f3n m\u00e1s adelante."
        }
      ],
      "id": "CVE-2024-56603",
      "lastModified": "2024-12-27T15:15:19.770",
      "published": "2024-12-27T15:15:19.770",
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}



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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.