CVE-2026-80825wifi: mt76: mt7925: ensure tx headroom in usb_sdio_tx_prepare_skb
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: ensure tx headroom in usb_sdio_tx_prepare_skb mt7925_usb_sdio_tx_prepare_skb() pushes a TX descriptor and a USB header onto every skb and assumes the headroom for them is already there. That holds for locally generated traffic, where mac80211 reserves hw->extra_tx_headroom, but forwarded frames are sent through ieee80211_8023_xmit(), which does not reserve it. Bridge a wired interface to an mt7925u AP and the first forwarded frame that arrives short panics the kernel: skbuff: skb_under_panic: len:415 put:4 tail:0x19b end:0x640 dev:wlan1 kernel BUG at net/core/skbuff.c:212! Call trace: skb_panic+0x58/0x60 (P) skb_push+0x58/0x60 mt7925_usb_sdio_tx_prepare_skb+0xf8/0x1b8 [mt7925_common] mt76u_tx_queue_skb+0xa0/0x1f8 [mt76_usb] __mt76_tx_queue_skb+0x54/0xe8 [mt76] mt76_txq_schedule.part.0+0x204/0x478 [mt76] mt76_txq_schedule_all+0x50/0x80 [mt76] mt792x_tx_worker+0x68/0x100 [mt792x_lib] __mt76_worker_fn+0x84/0x150 [mt76] Whether a given setup hits it depends on how much headroom the ingress netdev leaves in its rx skbs. Reproduced on a Raspberry Pi 5 bridging onboard ethernet to a Netgear A9000; originally reported on an MT7986 router running OpenWrt. Nick Morrow's testing on a Pi 4 (bcmgenet), which leaves more headroom, helped narrow the trigger to the ingress path. The same bug was fixed on mt7921 by commit 98c4d0abf5c4 ("mt76: mt7921: don't assume adequate headroom for SDIO headers"), but mt7925 was copied from mt7921 without the fix. Add the same guard here.
Timeline
ID reserved
By Linux
- 9 days later
· 9 days later
Published
- 45 days later
· 45 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected c948b5da6bbec742b433138e3e3f9537a85af2e5 – < 9a72b180f0575e41471e088e09bddc4b73d6dee2
- affected c948b5da6bbec742b433138e3e3f9537a85af2e5 – < 22edb6786127271aeba7abd30f152977c605c6a3
- affected c948b5da6bbec742b433138e3e3f9537a85af2e5 – < 8d481f93588932a95f657671d4e1601b90d130cc
- affected c948b5da6bbec742b433138e3e3f9537a85af2e5 – < e5e8fc11a7ac578f16079f855b7fffc1649d053c
- affected c948b5da6bbec742b433138e3e3f9537a85af2e5 – < ef3e34874d2332d0f63e72c2c35ce5c93568c125
- affected 6.7
- unaffected < 6.7
- unaffected 6.12.108 – ≤ 6.12.*
- unaffected 6.18.49 – ≤ 6.18.*
- unaffected 7.1.13 – ≤ 7.1.*
- unaffected 7.2.3 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/9a72b180f0575e41471e088e09bddc4b73d6dee2 (opens in a new tab)
- https://git.kernel.org/stable/c/22edb6786127271aeba7abd30f152977c605c6a3 (opens in a new tab)
- https://git.kernel.org/stable/c/8d481f93588932a95f657671d4e1601b90d130cc (opens in a new tab)
- https://git.kernel.org/stable/c/e5e8fc11a7ac578f16079f855b7fffc1649d053c (opens in a new tab)
- https://git.kernel.org/stable/c/ef3e34874d2332d0f63e72c2c35ce5c93568c125 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-71275 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80825)Record last updated .