CVE-2026-99192net: bcmgenet: unshare the skb before writing the control block
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 92% 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: net: bcmgenet: unshare the skb before writing the control block bcmgenet stores first_cb, last_cb and bytes_sent in the skb control block and reads them back on completion to free the skb and credit BQL. ether_setup() leaves IFF_TX_SKB_SHARING set, so the stack can resubmit a shared skb that is still in the ring. The next transmit overwrites last_cb, so the earlier slots complete without crediting their bytes and BQL stalls the queue until the watchdog resets it. Unshare the skb before writing the control block. Reproduce with pktgen in clone_skb mode, which hands the driver the same skb while earlier copies are still in the ring: modprobe pktgen pg=/proc/net/pktgen echo "add_device eth0" > $pg/kpktgend_0 echo "dst_mac AA:BB:CC:DD:EE:FF" > $pg/eth0 echo "dst 192.0.2.1" > $pg/eth0 echo "clone_skb 8" > $pg/eth0 echo "count 0" > $pg/eth0 echo start > $pg/pgctrl & sleep 5 echo stop > $pg/pgctrl wait cat /sys/class/net/eth0/queues/tx-0/byte_queue_limits/inflight inflight stays nonzero on the now idle queue. clone_skb 0 leaves it at zero.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 2 days later
· 2 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)
- 0.18% · top 92% 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 f48bed16a756f5bc0244acd581f61968f7d7c2a4 – < c13d43c92bc89f494592a60e624a7c0c42218d36
- affected f48bed16a756f5bc0244acd581f61968f7d7c2a4 – < e5aa07c62e4fda1206d314c9ea36d67cd6b95cad
- affected f48bed16a756f5bc0244acd581f61968f7d7c2a4 – < 2e5fb9dd3aca0da534793ad8123b81deff396efe
- affected f48bed16a756f5bc0244acd581f61968f7d7c2a4 – < 40c04abcbc34e3afe338f41dae851ecbd72852ac
- affected f48bed16a756f5bc0244acd581f61968f7d7c2a4 – < 7939ad3b4db9eadf45a64f0524f38337a9494672
- affected f48bed16a756f5bc0244acd581f61968f7d7c2a4 – < 89771ce4f8f67dcffae561b2ccac95c0f6e3aa01
- affected fb4ca2b4bc6712a6ad635df5b9b41131846589f9
- affected 3.16.50 – < 3.17
- affected 4.13
- unaffected < 4.13
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.59 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/c13d43c92bc89f494592a60e624a7c0c42218d36 (opens in a new tab)
- https://git.kernel.org/stable/c/e5aa07c62e4fda1206d314c9ea36d67cd6b95cad (opens in a new tab)
- https://git.kernel.org/stable/c/2e5fb9dd3aca0da534793ad8123b81deff396efe (opens in a new tab)
- https://git.kernel.org/stable/c/40c04abcbc34e3afe338f41dae851ecbd72852ac (opens in a new tab)
- https://git.kernel.org/stable/c/7939ad3b4db9eadf45a64f0524f38337a9494672 (opens in a new tab)
- https://git.kernel.org/stable/c/89771ce4f8f67dcffae561b2ccac95c0f6e3aa01 (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-2026-111944 (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-2026-99192)Record last updated .