CVE-2026-89877 (GCVE-0-2026-89877)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:31 – Updated: 2026-10-30 12:33
VLAI
Title
media: saa7164: fix cleanup on resource allocation failure
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.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < ac9d7ca8199c64c320ba8177e3c0f7b0deb7ff06 (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < 99bf01e2563f8bdfe5f25e489596cff455a35d6b (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < daa5b32cdf7db81a07ee2a91ce092a363e7754aa (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < 77f216f8de6221efb6f6c471bc9e598f1879825b (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < 69259c627009bf7621010ae9e997dad2dad3339c (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < 4d2048466af9e2c960c5be6dcd317e3b657d268b (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < fc65623524b5bf23baddc6ae688d954fba0d5de2 (git)
Affected: 443c1228d50518f3c550e1fef490a2c9d9246ce7 , < 28e84c6e2e6753ed238ea097b2842a32a6a6879b (git)
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Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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            "version": "3.1"
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              "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."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-09-16T10:31:44.194Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-10-30T12:33:22.773Z",
    "state": "PUBLISHED"
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            "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."
          }
        ],
        "id": "CVE-2026-89877",
        "lastModified": "2026-10-30T13:20:34.540",
        "metrics": {
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-16T11:16:55.987",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-06T19:51:03+00:00",
      "cve": "CVE-2026-89877",
      "id": "CVE-2026-89877",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_affected": "77",
      "product_status:known_not_affected": "126",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: saa7164: fix cleanup on resource allocation failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89877.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.