{"schema":"threatline.record/2","record":{"id":"CVE-2026-98827","aliases":[],"summary":"wifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE","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->buf\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->len 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->len\na running total and advance tx_buf->offset per record instead; the\nstride round_up(nskb->len + 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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98827","source_modified_at":"2026-10-19T09:26:19.987Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"fb9987d0f748c983bb795a86f47522313f701a08","lessThan":"c18882768a0fe253c70986c5fe66d9241570fbc4","status":"affected","versionType":"git"},{"version":"fb9987d0f748c983bb795a86f47522313f701a08","lessThan":"345ce265cf604e84b5b560c21beaf4c6f269ab14","status":"affected","versionType":"git"},{"version":"fb9987d0f748c983bb795a86f47522313f701a08","lessThan":"e73a619f91b6cfec47bc1a94aea28df6849e5be3","status":"affected","versionType":"git"},{"version":"fb9987d0f748c983bb795a86f47522313f701a08","lessThan":"aeaca27c1db3106967ffbb2b517d98c835f6d500","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98827","source_modified_at":"2026-10-19T09:26:19.987Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98827","source_modified_at":"2026-10-19T09:26:19.987Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"345ce265cf604e84b5b560c21beaf4c6f269ab14","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09323,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:49:20.872Z","modified_at":"2026-10-19T09:26:19.987Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98827","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:26:19.987Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98827","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:26:19.987Z","content_hash":"601751d8d018ad6d989cc906409632830e9356b348cb291f0ba5933e3be3129c"}}