CVE-2026-93039 (GCVE-0-2026-93039)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-10-19 09:04
VLAI
Title
ASoC: meson: Keep link pointers valid on realloc failure
Summary
In the Linux kernel, the following vulnerability has been resolved: ASoC: meson: Keep link pointers valid on realloc failure meson_card_reallocate_links() grows the DAI link and private data arrays with two consecutive krealloc() calls and updates the owner pointers only after both calls have succeeded. A successful krealloc() may move the data: it frees the old block and returns a new one. When that happens for the link array and the second krealloc() then fails, card->dai_link still points to the block that krealloc() already freed, and the error path frees the new block too. The probe error path then calls meson_card_clean_references(), which dereferences card->dai_link and kfree()s it again, resulting in a use-after-free and a double free. Commit card->dai_link and card->num_links right after the first krealloc() succeeds, so the pointer always refers to a valid allocation that meson_card_clean_references() can walk and free. krealloc() with __GFP_ZERO zero-initializes the added entries, so walking them on the error path is safe. With both failure paths reduced to a plain return, drop the goto labels and the error message.
Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/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 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < de33afc57f24538186bccf4c4f6c65dd38634fd8 (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642 (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 8db0a0fc84e80aa9924e0833aef6cc95df94e5a7 (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 0b30fbe6bf7cf6499b19dd886f466e7c9e820089 (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe (git)
Affected: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b , < 2aaa41cf974f83a6fb105422bac4e2f107150774 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 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: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/soc/meson/meson-card-utils.c"
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              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
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                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: meson: Keep link pointers valid on realloc failure\n\nmeson_card_reallocate_links() grows the DAI link and private data\narrays with two consecutive krealloc() calls and updates the owner\npointers only after both calls have succeeded.\n\nA successful krealloc() may move the data: it frees the old block and\nreturns a new one. When that happens for the link array and the second\nkrealloc() then fails, card-\u003edai_link still points to the block that\nkrealloc() already freed, and the error path frees the new block too.\nThe probe error path then calls meson_card_clean_references(), which\ndereferences card-\u003edai_link and kfree()s it again, resulting in a\nuse-after-free and a double free.\n\nCommit card-\u003edai_link and card-\u003enum_links right after the first\nkrealloc() succeeds, so the pointer always refers to a valid allocation\nthat meson_card_clean_references() can walk and free. krealloc() with\n__GFP_ZERO zero-initializes the added entries, so walking them on the\nerror path is safe. With both failure paths reduced to a plain return,\ndrop the goto labels and the error message."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - meson_card_reallocate_links() is reached only from meson_card_probe() (axg_card_pdrv.probe for compatible \"amlogic,axg-sound-card\") via meson_card_add_links() and axg_card_add_tdm_loopback(); no network protocol message or USB descriptor carries the dangling dai_link pointer.\nAC:H - The UAF fires only if meson_card_reallocate_links()\u0027s krealloc of card-\u003edai_link succeeds and the following krealloc of priv-\u003elink_data returns NULL. Both are GFP_KERNEL (reclaim allowed). meson_card_probe() then returns -ENOMEM; snd_soc_bind_card() maps DAI-component -EPROBE_DEFER to 0, so driver core does not retry axg_card_add_tdm_loopback().\nPR:N - meson_card_probe() and axg_card_add_tdm_loopback() have no capable() check. On Amlogic boards whose DT includes amlogic,axg-sound-card with a TDM playback link (meson-axg-s400.dts dai-link-6 / meson-khadas-vim3.dtsi dai-link-6), of_platform or udev autoload of snd-soc-meson-axg-sound-card runs this probe without an OS account.\nUI:N - axg_card_add_tdm_loopback() runs inside meson_card_probe() during automatic platform bind of the DT sound node; no victim must open /dev/snd/*, mount media, or plug extra hardware.\nS:U - meson_card_clean_references() use-after-frees and double-frees the host-kernel card-\u003edai_link array from meson_card_reallocate_links(); impact stays in this kernel and is not a VM escape or IOMMU/DMA bypass.\nC:H - On the second-krealloc failure, meson_card_clean_references() walks the stale card-\u003edai_link with for_each_card_prelinks() and reads link-\u003ecpus and link-\u003ecodecs from the already-freed snd_soc_dai_link array, a heap UAF read.\nI:H - The same path kfree()s card-\u003edai_link again (the old block krealloc may already have freed, or err_ldata\u0027s kfree(links) already released) and of_node_put()s pointers loaded from that freed array, a double-free/UAF write primitive.\nA:H - meson_card_clean_references() dereferences and kfree()s the freed dai_link array after meson_card_reallocate_links() returns -ENOMEM, causing a kernel oops or panic (slab UAF / invalid-free)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:34.291Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/de33afc57f24538186bccf4c4f6c65dd38634fd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642"
        },
        {
          "url": "https://git.kernel.org/stable/c/8db0a0fc84e80aa9924e0833aef6cc95df94e5a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b30fbe6bf7cf6499b19dd886f466e7c9e820089"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/2aaa41cf974f83a6fb105422bac4e2f107150774"
        }
      ],
      "title": "ASoC: meson: Keep link pointers valid on realloc failure",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93039",
    "datePublished": "2026-09-17T16:10:32.812Z",
    "dateReserved": "2026-09-17T15:57:05.657Z",
    "dateUpdated": "2026-10-19T09:04:34.291Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-93039",
      "date": "2026-10-30",
      "epss": "0.00159",
      "percentile": "0.05051"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
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                "vendor": "Linux",
                "versions": [
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                  {
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                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
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                  {
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                    "status": "unaffected",
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                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
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                    "status": "unaffected",
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                    "versionType": "semver"
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                    "version": "6.18.52",
                    "versionType": "semver"
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                    "versionType": "semver"
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          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: meson: Keep link pointers valid on realloc failure\n\nmeson_card_reallocate_links() grows the DAI link and private data\narrays with two consecutive krealloc() calls and updates the owner\npointers only after both calls have succeeded.\n\nA successful krealloc() may move the data: it frees the old block and\nreturns a new one. When that happens for the link array and the second\nkrealloc() then fails, card-\u003edai_link still points to the block that\nkrealloc() already freed, and the error path frees the new block too.\nThe probe error path then calls meson_card_clean_references(), which\ndereferences card-\u003edai_link and kfree()s it again, resulting in a\nuse-after-free and a double free.\n\nCommit card-\u003edai_link and card-\u003enum_links right after the first\nkrealloc() succeeds, so the pointer always refers to a valid allocation\nthat meson_card_clean_references() can walk and free. krealloc() with\n__GFP_ZERO zero-initializes the added entries, so walking them on the\nerror path is safe. With both failure paths reduced to a plain return,\ndrop the goto labels and the error message."
          }
        ],
        "id": "CVE-2026-93039",
        "lastModified": "2026-10-19T10:16:53.520",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.4,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:17:56.977",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0b30fbe6bf7cf6499b19dd886f466e7c9e820089"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2aaa41cf974f83a6fb105422bac4e2f107150774"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8db0a0fc84e80aa9924e0833aef6cc95df94e5a7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/de33afc57f24538186bccf4c4f6c65dd38634fd8"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-20T13:23:20+00:00",
      "cve": "CVE-2026-93039",
      "id": "CVE-2026-93039",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ASoC: meson: Keep link pointers valid on realloc failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93039.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-20T00:30:31Z",
      "cve": "CVE-2026-93039",
      "id": "CVE-2026-93039",
      "initial_release_date": "2026-09-18T00:13:07Z",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "172",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93039",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-93039.json",
      "version": "5"
    }
  }
}



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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.