CVE-2026-53385 (GCVE-0-2026-53385)
Vulnerability from cvelistv5
Published
2026-07-19 11:59
Modified
2026-08-17 04:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write A KASAN null-ptr-deref was observed in vcs_notifier(): BUG: KASAN: null-ptr-deref in vcs_notifier+0x98/0x130 Read of size 2 at addr qmp_cmd_name: qmp_capabilities, arguments: {} The issue is a race condition in vcs_write(). When the console_lock is temporarily dropped (to copy data from userspace), the vc_data pointer obtained from vcs_vc() may become stale. After re-acquiring the lock, vcs_vc() is called again to re-validate the pointer. If the vc has been deallocated in the meantime, vcs_vc() returns NULL, and the while loop breaks (with written > 0). However, after the loop, vcs_scr_updated(vc) is still called with the now-NULL vc pointer, leading to a null pointer dereference in the notifier chain (vcs_notifier dereferences param->vc). Fix this by adding a NULL check for vc before calling vcs_scr_updated().
References
Impacted products
Vendor Product Version
Linux Linux Version: 11dddfbb7a4e62489b01074d6c04d9d1b42e4047
Version: e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67
Version: 3338d0b9acde770ee588eead5cac32c25e7048fc
Version: 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357
Version: 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357
Version: 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357
Version: 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357
Version: 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357
Version: 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357
Version: 934de9a9b659785fed3e820bc0c813a460c71fea
Version: 0deff678157333d775af190f84696336cdcccd6d
Version: a4e3c4c65ae8510e01352c9a4347e05c035b2ce2
Version: 1de42e7653d6714a7507ba6696151a1fa028c69f
Version: 5.10.181   ≤
Version: 5.15.113   ≤
Version: 6.1.30   ≤
Version: 4.14.327   ≤
Version: 4.19.284   ≤
Version: 5.4.244   ≤
Version: 6.3.4   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write\n\nA KASAN null-ptr-deref was observed in vcs_notifier():\n\nBUG: KASAN: null-ptr-deref in vcs_notifier+0x98/0x130\nRead of size 2 at addr qmp_cmd_name: qmp_capabilities, arguments: {}\n\nThe issue is a race condition in vcs_write(). When the console_lock is\ntemporarily dropped (to copy data from userspace), the vc_data pointer\nobtained from vcs_vc() may become stale. After re-acquiring the lock,\nvcs_vc() is called again to re-validate the pointer. If the vc has been\ndeallocated in the meantime, vcs_vc() returns NULL, and the while loop\nbreaks (with written \u003e 0). However, after the loop, vcs_scr_updated(vc)\nis still called with the now-NULL vc pointer, leading to a null pointer\ndereference in the notifier chain (vcs_notifier dereferences param-\u003evc).\n\nFix this by adding a NULL check for vc before calling vcs_scr_updated()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:36.006Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/43a6281790273c1b0a9ab76609ff0245b968f1e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6bbb85cf45bf0b070e741997fe0af3a772c5ad5"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff4806202749a51938236214adc0281481a57366"
        },
        {
          "url": "https://git.kernel.org/stable/c/8232fca738011ca2ec865b46ec721d1796dc0580"
        },
        {
          "url": "https://git.kernel.org/stable/c/73049768ad57145acd337102c5aa3c788e6642c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/7cc3dd79777f6ae4625ec37e84dd18a26dc88bde"
        },
        {
          "url": "https://git.kernel.org/stable/c/74be188eb2dc1c99d63986167b9a67d415fe7326"
        },
        {
          "url": "https://git.kernel.org/stable/c/09a43e81279b8da15526da09877134b8bcf618b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/a287620312dc6dcb9a093417a0e589bf30fcf38a"
        }
      ],
      "title": "vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53385",
    "datePublished": "2026-07-19T11:59:32.732Z",
    "dateReserved": "2026-06-09T07:44:35.401Z",
    "dateUpdated": "2026-08-17T04:50:36.006Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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