CVE-2026-89877 (GCVE-0-2026-89877)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-30 12:33
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: saa7164: fix cleanup on resource allocation failure saa7164_dev_setup() adds the device to the global saa7164_devlist before requesting the PCI BAR memory regions. If get_resources() fails, saa7164_dev_setup() decrements the device count and returns an error, but leaves the device on saa7164_devlist. The probe error path then frees the device, leaving a dangling entry on the global list. Reuse the existing MMIO mapping error path to remove the device from saa7164_devlist and decrement the device count before returning. Also release BAR0 if it was successfully requested but the BAR2 request fails.
References
Impacted products
Vendor Product Version
Linux Linux Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
Version: 443c1228d50518f3c550e1fef490a2c9d9246ce7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/pci/saa7164/saa7164-core.c"
          ],
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.32"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.1.188",
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              "status": "unaffected",
              "version": "6.6.157",
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
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              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.273",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.224",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
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                  "vulnerable": true
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: saa7164: fix cleanup on resource allocation failure\n\nsaa7164_dev_setup() adds the device to the global saa7164_devlist before\nrequesting the PCI BAR memory regions.\n\nIf get_resources() fails, saa7164_dev_setup() decrements the device count\nand returns an error, but leaves the device on saa7164_devlist. The probe\nerror path then frees the device, leaving a dangling entry on the global\nlist.\n\nReuse the existing MMIO mapping error path to remove the device from\nsaa7164_devlist and decrement the device count before returning.\n\nAlso release BAR0 if it was successfully requested but the BAR2 request\nfails."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only from saa7164 PCI probe (saa7164_initdev \u2192 saa7164_dev_setup \u2192 get_resources()) on a locally attached NXP SAA7164/Hauppauge HVR card; PVR, HTPC, and broadcast systems enumerate that function at boot, udev bind, or PCI/Thunderbolt hotplug, which is a local PCI probe path, not a network or USB protocol path.\nAC:L - A 1131:7164 function whose BAR0 or BAR2 cannot be reserved (zero-length BAR, overlap with busy iomem, or BAR2 failing after BAR0 was claimed) makes get_resources() return -EBUSY on every probe, so the dangling saa7164_devlist UAF is deterministic with no race or layout lottery the attacker cannot influence.\nPR:N - saa7164_initdev() performs no capability or authentication checks; when a matching PCI function appears, kernel enumeration and udev module autoload run the failing get_resources() path automatically without an OS account or user-namespace privilege.\nUI:N - Probe is invoked automatically by the PCI core and udev-driven module autoload on device enumeration; no victim must open a V4L/DVB node, load firmware, or otherwise interact.\nS:U - The dangling saa7164_devlist pointer and follow-on use-after-free remain inside the host kernel saa7164 driver and do not cross a VM, IOMMU, or sandbox security boundary.\nC:H - After kfree(dev) the global saa7164_devlist still points at the freed saa7164_dev; debugfs seq_start/seq_show and later probes walk that object, so reclaimed heap contents including kernel pointers can be read back \u2014 a use-after-free read primitive.\nI:H - The next list_add_tail() or list_del() on saa7164_devlist writes next/prev through the freed list node, corrupting whatever slab object reused that allocation and enabling an arbitrary kernel write and control-flow hijack.\nA:H - Walking or mutating the dangling saa7164_devlist entry after kfree causes a kernel oops or panic via poisoned-slab dereference or list corruption, fully denying availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:33:22.773Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ac9d7ca8199c64c320ba8177e3c0f7b0deb7ff06"
        },
        {
          "url": "https://git.kernel.org/stable/c/99bf01e2563f8bdfe5f25e489596cff455a35d6b"
        },
        {
          "url": "https://git.kernel.org/stable/c/daa5b32cdf7db81a07ee2a91ce092a363e7754aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/77f216f8de6221efb6f6c471bc9e598f1879825b"
        },
        {
          "url": "https://git.kernel.org/stable/c/69259c627009bf7621010ae9e997dad2dad3339c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d2048466af9e2c960c5be6dcd317e3b657d268b"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc65623524b5bf23baddc6ae688d954fba0d5de2"
        },
        {
          "url": "https://git.kernel.org/stable/c/28e84c6e2e6753ed238ea097b2842a32a6a6879b"
        }
      ],
      "title": "media: saa7164: fix cleanup on resource allocation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89877",
    "datePublished": "2026-09-16T10:31:44.194Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-10-30T12:33:22.773Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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