CVE-2022-50758 (GCVE-0-2022-50758)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-08-05 08:59
VLAI
Title
staging: vt6655: fix potential memory leak
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: vt6655: fix potential memory leak In function device_init_td0_ring, memory is allocated for member td_info of priv->apTD0Rings[i], with i increasing from 0. In case of allocation failure, the memory is freed in reversed order, with i decreasing to 0. However, the case i=0 is left out and thus memory is leaked. Modify the memory freeing loop to include the case i=0.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < e741e38aa98704fbb959650ecd270b71b2670680 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < 16a45e78a687eb6c69acc4e62b94b6508b0bfbda (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < 1b3cebeca99e8e0aa4fa57faac8dbf41e967317a (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < ff8551d411f12b5abc5ca929ab87643afa8a9588 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < fb5f569bcda8f87bd47d8030bfae343d757fa3ea (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < cfdf139258614ef65b0f68b857ada5328fb7c0e5 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < c8ff91535880d41b49699b3829fb6151942de29e (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 4.19.262 , ≤ 4.19.* (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
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          "nodes": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: vt6655: fix potential memory leak\n\nIn function device_init_td0_ring, memory is allocated for member\ntd_info of priv-\u003eapTD0Rings[i], with i increasing from 0. In case of\nallocation failure, the memory is freed in reversed order, with i\ndecreasing to 0. However, the case i=0 is left out and thus memory is\nleaked.\n\nModify the memory freeing loop to include the case i=0."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
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              "value": "AV:L - The bug is reached only via the local mac80211 start path (ieee80211_open \u2192 drv_start \u2192 vnt_start \u2192 device_init_td0_ring) when bringing up the VIA VT6655 interface, not by processing Wi-Fi frames from a peer.\nAC:L - A local attacker who can start the interface can induce the kzalloc failure path through attacker-controlled memory pressure and retry bring-up until the error path hits; the buggy while (--i) cleanup then runs deterministically.\nPR:L - Interface bring-up requires CAP_NET_ADMIN, but in realistic deployments (NetworkManager/polkit seat policies, delegated net admin) an unprivileged local user can enable the wireless interface, so this is Low rather than High.\nUI:N - The attacker brings the interface up under memory pressure themselves; no separate victim action is required.\nS:U - Impact stays inside the host kernel\u2019s vt6655/mac80211 authority with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - On i==0 failure, while (--i) indexes apTD0Rings[-1] into the previously initialized adjacent aRD1Ring and frees live rd_info objects, then continues OOB\u2014heap corruption enabling arbitrary kernel read primitives.\nI:H - The same OOB/double-free of descriptor side objects (kfree on adjacent or garbage pointers) is exploitable for heap corruption and control-flow hijacking beyond a pure crash.\nA:H - When kzalloc fails at i=0, while (--i) decrements through invalid indices and frees adjacent/garbage objects in an effectively unbounded loop, causing kernel oops/hang even without full exploitation."
            }
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        },
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          "url": "https://git.kernel.org/stable/c/c8ff91535880d41b49699b3829fb6151942de29e"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50758",
    "datePublished": "2025-12-24T13:05:51.159Z",
    "dateReserved": "2025-12-24T13:02:21.545Z",
    "dateUpdated": "2026-08-05T08:59:44.493Z",
    "state": "PUBLISHED"
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      "date": "2026-09-15",
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      "percentile": "0.10616"
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-20T12:53:03+00:00",
      "cve": "CVE-2022-50758",
      "id": "CVE-2022-50758",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Kernel: Memory leak in vt6655 driver via improper memory deallocation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50758.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:23:44Z",
      "cve": "CVE-2022-50758",
      "id": "CVE-2022-50758",
      "initial_release_date": "2025-12-25T01:04:02Z",
      "product_status:known_affected": "354",
      "product_status:known_not_affected": "420",
      "product_status:recommended": "200",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50758",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50758.json",
      "version": "29"
    }
  }
}



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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.

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  • 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.
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  • 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.


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