CVE-2026-93039 (GCVE-0-2026-93039)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
Version: 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/soc/meson/meson-card-utils.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "de33afc57f24538186bccf4c4f6c65dd38634fd8",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "8db0a0fc84e80aa9924e0833aef6cc95df94e5a7",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "0b30fbe6bf7cf6499b19dd886f466e7c9e820089",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            },
            {
              "lessThan": "2aaa41cf974f83a6fb105422bac4e2f107150774",
              "status": "affected",
              "version": "7864a79f37b55769b817d5e6c5ae0ca4bfdba93b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/soc/meson/meson-card-utils.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.