{"api_version":"1","generated_at":"2026-10-25T16:57:59+00:00","cve":"CVE-2026-98827","urls":{"html":"https://cve.report/CVE-2026-98827","api":"https://cve.report/api/cve/CVE-2026-98827.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98827","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98827"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:36","updated_at":"2026-10-19 10:19:46"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500","name":"https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14","name":"https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3","name":"https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4","name":"https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98827","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98827","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fb9987d0f748c983bb795a86f47522313f701a08 c18882768a0fe253c70986c5fe66d9241570fbc4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fb9987d0f748c983bb795a86f47522313f701a08 345ce265cf604e84b5b560c21beaf4c6f269ab14 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fb9987d0f748c983bb795a86f47522313f701a08 e73a619f91b6cfec47bc1a94aea28df6849e5be3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fb9987d0f748c983bb795a86f47522313f701a08 aeaca27c1db3106967ffbb2b517d98c835f6d500 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.35","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.35 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.56 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.10 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/wireless/ath/ath9k/hif_usb.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c18882768a0fe253c70986c5fe66d9241570fbc4","status":"affected","version":"fb9987d0f748c983bb795a86f47522313f701a08","versionType":"git"},{"lessThan":"345ce265cf604e84b5b560c21beaf4c6f269ab14","status":"affected","version":"fb9987d0f748c983bb795a86f47522313f701a08","versionType":"git"},{"lessThan":"e73a619f91b6cfec47bc1a94aea28df6849e5be3","status":"affected","version":"fb9987d0f748c983bb795a86f47522313f701a08","versionType":"git"},{"lessThan":"aeaca27c1db3106967ffbb2b517d98c835f6d500","status":"affected","version":"fb9987d0f748c983bb795a86f47522313f701a08","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/wireless/ath/ath9k/hif_usb.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.35"},{"lessThan":"2.6.35","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.56","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.56","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.10","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"2.6.35","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:26:19.987Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4"},{"url":"https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14"},{"url":"https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3"},{"url":"https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500"}],"title":"wifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98827","datePublished":"2026-10-18T15:49:20.872Z","dateReserved":"2026-09-25T10:25:14.372Z","dateUpdated":"2026-10-19T09:26:19.987Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:36","lastModifiedDate":"2026-10-19 10:19:46","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98827","Ordinal":"1","Title":"wifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE","CVE":"CVE-2026-98827","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98827","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: ath9k_htc: bound TX aggregation to MAX_TX_BUF_SIZE"}]}}}