{"id":"CVE-2026-98827","revision":"da2f46acb7904fb3b4543295b5646afc","records":[{"revision":"da2f46acb7904fb3b4543295b5646afc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98827","aliases":[],"title":"wifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE","description":"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.","state":0,"publishedAt":"2026-10-18T15:49:20.872+00:00","modifiedAt":"2026-10-19T09:26:19.987+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/wireless/ath/ath9k/hif_usb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"fb9987d0f748c983bb795a86f47522313f701a08\",\n                            \"lessThan\": \"c18882768a0fe253c70986c5fe66d9241570fbc4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fb9987d0f748c983bb795a86f47522313f701a08\",\n                            \"lessThan\": \"345ce265cf604e84b5b560c21beaf4c6f269ab14\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fb9987d0f748c983bb795a86f47522313f701a08\",\n                            \"lessThan\": \"e73a619f91b6cfec47bc1a94aea28df6849e5be3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fb9987d0f748c983bb795a86f47522313f701a08\",\n                            \"lessThan\": \"aeaca27c1db3106967ffbb2b517d98c835f6d500\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/wireless/ath/ath9k/hif_usb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.35\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.35\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.113\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.56\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.10\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4","https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14","https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3","https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98827","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98827","identifiers":["CVE-2026-98827"]},"retained":false,"historicalAffected":[]}],"coverage":[]}