CVE-2026-98711 (GCVE-0-2026-98711)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:46 – Updated: 2026-10-30 12:39
VLAI
Title
wifi: cw1200: fix TX padding OOB read leaking heap data to device
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: cw1200: fix TX padding OOB read leaking heap data to device The TX path rounds the transfer size up to the bus alignment (align_size(), up to 511 bytes for SDIO, 1 byte for SPI) but sends the padded length straight from the frame buffer, which has no room reserved for the padding. cw1200_data_write() therefore reads past the end of the frame and the bus transfer carries those bytes to the device. A bogus device can collect up to 511 bytes of kernel heap data per TX frame. The RX path does not have this problem: it allocates the skb with the aligned length (alloc_len) before reading. Compute the exact padding with the bus align_size() callback, make sure queued TX frames have tailroom for it, and zero the padding bytes before the transfer so nothing past the frame is exposed. This is not expected to change driver behavior on most cases: frame contents and transfer sizes are unchanged, only the content of the padding bytes (previously undefined stale memory, now zero), which the device never reads since the WSM header carries the real frame length. The skb expansion can only fail under memory exhaustion, in which case the frame is dropped like on the existing error paths of cw1200_tx(). Discovered by Atuin - Automated Vulnerability Discovery Engine.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < 8e8e4d0b15f174d964a48b1c54dc8828e5ae87c5 (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < a7eae7547ae1443bfbca2cb90d3ef5e501d6445c (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < 5897945635aa5413595bf696127493be96c08e2d (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < b66539a4dab128fafaad736b53ce15c19d14d561 (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < 71f693a0ecccf36532dd2790f7969da6c71d5d23 (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < b0e97bd40e0c2cb1a3530ef8f6250aacf3224515 (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < 678c8f4ba285649d5418a858d5d4f30c728a54ad (git)
Affected: a910e4a94f6923c8c988565525f017f687bf7205 , < 7c1611780823b76219cb1478db53dfd890c4a9a2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cw1200: fix TX padding OOB read leaking heap data to device\n\nThe TX path rounds the transfer size up to the bus alignment\n(align_size(), up to 511 bytes for SDIO, 1 byte for SPI) but sends\nthe padded length straight from the frame buffer, which has no room\nreserved for the padding.  cw1200_data_write() therefore reads past\nthe end of the frame and the bus transfer carries those bytes to the\ndevice.  A bogus device can collect up to 511 bytes of kernel heap\ndata per TX frame.\n\nThe RX path does not have this problem: it allocates the skb with\nthe aligned length (alloc_len) before reading.\n\nCompute the exact padding with the bus align_size() callback, make\nsure queued TX frames have tailroom for it, and zero the padding\nbytes before the transfer so nothing past the frame is exposed.\n\nThis is not expected to change driver behavior on most cases: frame\ncontents and transfer sizes are unchanged, only the content of the\npadding bytes (previously undefined stale memory, now zero), which\nthe device never reads since the WSM header carries the real frame\nlength.  The skb expansion can only fail under memory exhaustion,\nin which case the frame is dropped like on the existing error paths\nof cw1200_tx().\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:02.373Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8e8e4d0b15f174d964a48b1c54dc8828e5ae87c5"
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          "url": "https://git.kernel.org/stable/c/a7eae7547ae1443bfbca2cb90d3ef5e501d6445c"
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        {
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        }
      ],
      "title": "wifi: cw1200: fix TX padding OOB read leaking heap data to device",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98711",
    "datePublished": "2026-10-18T15:46:44.001Z",
    "dateReserved": "2026-09-25T10:25:14.365Z",
    "dateUpdated": "2026-10-30T12:39:02.373Z",
    "state": "PUBLISHED"
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      "title": "wifi: cw1200: fix TX padding OOB read leaking heap data to device",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98711.json",
      "version": "4"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cw1200: fix TX padding OOB read leaking heap data to device\n\nThe TX path rounds the transfer size up to the bus alignment\n(align_size(), up to 511 bytes for SDIO, 1 byte for SPI) but sends\nthe padded length straight from the frame buffer, which has no room\nreserved for the padding.  cw1200_data_write() therefore reads past\nthe end of the frame and the bus transfer carries those bytes to the\ndevice.  A bogus device can collect up to 511 bytes of kernel heap\ndata per TX frame.\n\nThe RX path does not have this problem: it allocates the skb with\nthe aligned length (alloc_len) before reading.\n\nCompute the exact padding with the bus align_size() callback, make\nsure queued TX frames have tailroom for it, and zero the padding\nbytes before the transfer so nothing past the frame is exposed.\n\nThis is not expected to change driver behavior on most cases: frame\ncontents and transfer sizes are unchanged, only the content of the\npadding bytes (previously undefined stale memory, now zero), which\nthe device never reads since the WSM header carries the real frame\nlength.  The skb expansion can only fail under memory exhaustion,\nin which case the frame is dropped like on the existing error paths\nof cw1200_tx().\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine."
          }
        ],
        "id": "CVE-2026-98711",
        "lastModified": "2026-10-30T13:21:20.680",
        "metrics": {},
        "published": "2026-10-18T16:17:24.653",
        "references": [
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            "url": "https://git.kernel.org/stable/c/b0e97bd40e0c2cb1a3530ef8f6250aacf3224515"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b66539a4dab128fafaad736b53ce15c19d14d561"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-20T08:10:49+00:00",
      "cve": "CVE-2026-98711",
      "id": "CVE-2026-98711",
      "initial_release_date": "2026-10-18T15:46:44.001000+00:00",
      "product_status:known_affected": "77",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: cw1200: Information disclosure via out-of-bounds read during frame transmission",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98711.json",
      "version": "3"
    }
  }
}



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  • 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

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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.