CVE-2026-93271 (GCVE-0-2026-93271)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:52 – Updated: 2026-10-19 09:08
VLAI
Title
wifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate ath11k can receive HT/VHT/HE frames whose reported MCS is above the maximum that can be expressed in the corresponding mac80211 rate space (e.g. an HE frame reported with MCS 12, while HE tops out at MCS 11). The frame itself is valid and decodes correctly, but for such a frame ath11k_dp_rx_h_rate() leaves rx_status->rate_idx set to the out-of-range value and never assigns rx_status->encoding, so it stays RX_ENC_LEGACY from the ath11k_dp_rx_h_ppdu() initialization. Once that frame reaches mac80211 it trips the rate sanity check and the frame is dropped with a splat: ath11k_pci 0000:03:00.0: Received with invalid mcs in HE mode 12 WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:5433 ieee80211_rx_list+0xb0a/0xe90 [mac80211] Dropping the frame would discard otherwise valid data, so instead cap the reported MCS to the maximum the rate space can express and deliver the frame. Set rx_status->encoding before the range check and assign rate_idx from the capped value, so a frame with an out-of-range MCS no longer leaves partial or bogus rate metadata behind. Also downgrade the logging level since they are not treated as invalid frames now. The only loss is that such a frame is reported as the capped MCS in the rx rate statistics. Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41
Severity
No CVSS data available.
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: d5c65159f2895379e11ca13f62feabe93278985d , < 6ad04c3e2ec54bf5ec72c81afdd66318a116c539 (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < a6b951f79e66fc8bd93a537ff1040fbfb567c8bf (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < b77bfe6e59b98dff3ccfcf9b45fc27e3db498626 (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < fb7b9a7209f839c17c66484dfdc84c9a23c6fd2f (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < a0b3e6f9645d88f387c4fea546048a91952cd4cd (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < 2bb2a778a487305bd378db5fd5014fbdce4ada2c (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < ccbd20f2168f581d90265da1a925b9b6472a0b05 (git)
Affected: d5c65159f2895379e11ca13f62feabe93278985d , < 12b09e478aa7459b7893a695ef77682202f2da83 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (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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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate\n\nath11k can receive HT/VHT/HE frames whose reported MCS is above the\nmaximum that can be expressed in the corresponding mac80211 rate space\n(e.g. an HE frame reported with MCS 12, while HE tops out at MCS 11).\n\nThe frame itself is valid and decodes correctly, but for such a frame\nath11k_dp_rx_h_rate() leaves rx_status-\u003erate_idx set to the out-of-range\nvalue and never assigns rx_status-\u003eencoding, so it stays RX_ENC_LEGACY\nfrom the ath11k_dp_rx_h_ppdu() initialization. Once that frame reaches\nmac80211 it trips the rate sanity check and the frame is dropped with a\nsplat:\n\n  ath11k_pci 0000:03:00.0: Received with invalid mcs in HE mode 12\n  WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:5433 ieee80211_rx_list+0xb0a/0xe90 [mac80211]\n\nDropping the frame would discard otherwise valid data, so instead cap the\nreported MCS to the maximum the rate space can express and deliver the\nframe. Set rx_status-\u003eencoding before the range check and assign rate_idx\nfrom the capped value, so a frame with an out-of-range MCS no longer\nleaves partial or bogus rate metadata behind. Also downgrade the logging\nlevel since they are not treated as invalid frames now. The only loss is\nthat such a frame is reported as the capped MCS in the rx rate statistics.\n\nTested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41"
        }
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        },
        {
          "url": "https://git.kernel.org/stable/c/12b09e478aa7459b7893a695ef77682202f2da83"
        }
      ],
      "title": "wifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate",
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    "datePublished": "2026-09-24T15:52:13.287Z",
    "dateReserved": "2026-09-17T16:02:15.098Z",
    "dateUpdated": "2026-10-19T09:08:25.791Z",
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      "title": "wifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93271.json",
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate\n\nath11k can receive HT/VHT/HE frames whose reported MCS is above the\nmaximum that can be expressed in the corresponding mac80211 rate space\n(e.g. an HE frame reported with MCS 12, while HE tops out at MCS 11).\n\nThe frame itself is valid and decodes correctly, but for such a frame\nath11k_dp_rx_h_rate() leaves rx_status-\u003erate_idx set to the out-of-range\nvalue and never assigns rx_status-\u003eencoding, so it stays RX_ENC_LEGACY\nfrom the ath11k_dp_rx_h_ppdu() initialization. Once that frame reaches\nmac80211 it trips the rate sanity check and the frame is dropped with a\nsplat:\n\n  ath11k_pci 0000:03:00.0: Received with invalid mcs in HE mode 12\n  WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:5433 ieee80211_rx_list+0xb0a/0xe90 [mac80211]\n\nDropping the frame would discard otherwise valid data, so instead cap the\nreported MCS to the maximum the rate space can express and deliver the\nframe. Set rx_status-\u003eencoding before the range check and assign rate_idx\nfrom the capped value, so a frame with an out-of-range MCS no longer\nleaves partial or bogus rate metadata behind. Also downgrade the logging\nlevel since they are not treated as invalid frames now. The only loss is\nthat such a frame is reported as the capped MCS in the rx rate statistics.\n\nTested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41"
          }
        ],
        "id": "CVE-2026-93271",
        "lastModified": "2026-10-19T10:17:18.557",
        "metrics": {},
        "published": "2026-09-24T16:17:24.133",
        "references": [
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            "url": "https://git.kernel.org/stable/c/fb7b9a7209f839c17c66484dfdc84c9a23c6fd2f"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T02:06:39+00:00",
      "cve": "CVE-2026-93271",
      "id": "CVE-2026-93271",
      "initial_release_date": "2026-09-24T00:00:00+00:00",
      "product_status:known_affected": "161",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: ath11k: cap out-of-range rx MCS instead of leaving bogus rate",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93271.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-10T01:05:20Z",
      "cve": "CVE-2026-93271",
      "id": "CVE-2026-93271",
      "initial_release_date": "2026-09-29T23:52:57Z",
      "product_status:known_affected": "598",
      "product_status:known_not_affected": "167",
      "product_status:recommended": "76",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93271",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-93271.json",
      "version": "8"
    }
  }
}



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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.