CVE-2022-50355 (GCVE-0-2022-50355)

Vulnerability from cvelistv5 – Published: 2025-09-17 14:56 – Updated: 2026-08-05 08:58
VLAI
Title
staging: vt6655: fix some erroneous memory clean-up loops
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: vt6655: fix some erroneous memory clean-up loops In some initialization functions of this driver, memory is allocated with 'i' acting as an index variable and increasing from 0. The commit in "Fixes" introduces some clean-up codes in case of allocation failure, which free memory in reverse order with 'i' decreasing to 0. However, there are some problems: - The case i=0 is left out. Thus memory is leaked. - In case memory allocation fails right from the start, the memory freeing loops will start with i=-1 and invalid memory locations will be accessed. One of these loops has been fixed in commit c8ff91535880 ("staging: vt6655: fix potential memory leak"). Fix the remaining erroneous loops.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:31 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < 637672a71f5016a40b0a6c0f3c8ad25eacedc8c3 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < 88b9cc60f26e8a05d1ddbddf91b09ca2915f20e0 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < 95ac62e8545be2b0a8cae0beef7c682e2e470e48 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < f19e5b7df54590c831f350381963f25585c8f7d5 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < a9e9806d1c315bc50dce05479a079b9a104474b8 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < ed11b73c963292e7b49c0f37025c58ed3b7921d6 (git)
Affected: 5341ee0adb17d12a96dc5344e0d267cd12b52135 , < 2a2db520e3ca5aafba7c211abfd397666c9b5f9d (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)
guessed Create a notification for this product.
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    },
    "redhat_vex": {
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      "current_release_date": "2026-06-30T10:31:52+00:00",
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      "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: staging: vt6655: fix some erroneous memory clean-up loops",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50355.json",
      "version": "3"
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                  "version": "3.1"
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                    "id": "CVE-2022-50355",
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            ],
            "problemTypes": [
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                "descriptions": [
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                    "cweId": "CWE-401",
                    "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
                    "lang": "en",
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                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T18:31:47.624Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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            "title": "CISA ADP Vulnrichment"
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        ],
        "cna": {
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                    },
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                  "value": "AV:L - The flaw is reached only when bringing up the vt6655 mac80211 interface (SIOCSIFFLAGS/ip link set up \u2192 ieee80211_open \u2192 drv_start \u2192 vnt_start \u2192 device_init_rd0/rd1/td1_ring), which is local driver initialization\u2014not packet parsing or adjacent-link frame injection.\nAC:L - A local attacker can induce memory pressure (memcg/mmap) so the first kzalloc or device_alloc_rx_buf in ring init fails after device_init_rings succeeds, then deterministically hit the broken while (--i) path; no race or attacker-uncontrollable layout is required.\nPR:L - Triggering vnt_start requires CAP_NET_ADMIN to set IFF_UP, but in realistic deployments (NetworkManager/polkit seat policies, delegated net admin) an unprivileged local user can enable the wireless interface; per guidance when uncertain this is scored Low rather than High.\nUI:N - The attacker brings the interface up and forces the allocation-failure cleanup themselves; no separate victim mount, click, or other interactive action is required.\nS:U - Impact is host-kernel heap corruption inside the staging PCI WiFi driver under the same OS authority, with no VM escape, IOMMU bypass, or other security-boundary crossing.\nC:H - On i==0 failure, while (--i) indexes aRD1Ring[-1]/apTD1Rings[-1] into the previously initialized adjacent DMA ring and frees live rd_info/td_info (double-free), and continues further OOB\u2014classic heap corruption enabling arbitrary kernel read primitives.\nI:H - The same OOB/double-free of descriptor side objects (kfree, dma_unmap, kfree_skb on adjacent or garbage pointers) is exploitable for heap corruption and control-flow hijacking beyond a pure crash.\nA:H - The buggy loop from i==0 decrements indefinitely through invalid indices and frees garbage/adjacent objects, causing kernel oops/panic even without full exploitation; any such crash is Availability High."
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}



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