{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "fb9987d0f748c983bb795a86f47522313f701a08"
            },
            {
              "fixed": "c18882768a0fe253c70986c5fe66d9241570fbc4"
            },
            {
              "fixed": "345ce265cf604e84b5b560c21beaf4c6f269ab14"
            },
            {
              "fixed": "e73a619f91b6cfec47bc1a94aea28df6849e5be3"
            },
            {
              "fixed": "aeaca27c1db3106967ffbb2b517d98c835f6d500"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.35"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.56"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98827.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE\n\n__hif_usb_tx() dequeues up to MAX_TX_AGGR_NUM (20) frames into a\nsingle tx_buf of MAX_TX_BUF_SIZE (32768) bytes, limiting the batch\nby record count but never by cumulative byte length.\n\nWith large frames (MTU 2304), 20 aggregated frames of 2292 bytes\neach exceed the allocation (20 * 2296 = 45920 bytes), so the\nmemcpy() in the loop writes up to 13152 bytes past tx_buf-\u003ebuf\nbefore usb_submit_urb().\n\nPeek the queue head and stop before copying any record that would\ncross MAX_TX_BUF_SIZE, then dispatch the current batch. Leftover\nskbs remain queued and are drained on the next URB completion.\n\nThe byte bound changes the loop's exit semantics: it can now exit\nbefore i == tx_skb_cnt - 1. Stock only finalized tx_buf-\u003elen on\nthat last index (len += offset), so an early break would submit a\nURB holding only the last record's length while every dequeued skb\nis freed on completion, silently dropping frames. Make tx_buf-\u003elen\na running total and advance tx_buf-\u003eoffset per record instead; the\nstride round_up(nskb-\u003elen + 4, 4) is identical to the stock stride\nwhen the loop runs to completion.\n\nTested on hardware with an MTU 2304 flood: the loop stops at\nrecord 15 (len = 32144, offset = 32144, within 32768), no\noversized URB is submitted, and MTU 1500 pings pass 20/20.",
  "id": "CVE-2026-98827",
  "modified": "2026-10-20T02:30:38.128209490Z",
  "published": "2026-10-18T15:49:20.872Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98827.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98827"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "wifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE"
}