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CVE-2026-99192— net: bcmgenet: unshare the skb before writing the control block

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： net: bcmgenet：在写入控制块之前对 skb 进行解共享（unshare） bcmgenet 驱动将 、 和 存储在 skb 的控制块中，并在传输完成后读取这些字段，以便释放 skb 并为 BQL（Byte Queue Limits，字节队列限制）机制提供字节计数。由于 保留了 标志，协议栈可能会重新提交一个仍处于环形缓冲区中的共享 skb。随后的传输操作会覆盖 ，导致较早的槽位在完成时无法正确累加其字节数，进而使 BQL 停滞该队列，直到看门狗触发重置。 修

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f48bed16a756f5bc0244acd581f61968f7d7c2a4< 40c04abcbc34e3afe338f41dae851ecbd72852ac affected
f48bed16a756f5bc0244acd581f61968f7d7c2a4< 7939ad3b4db9eadf45a64f0524f38337a9494672 affected
f48bed16a756f5bc0244acd581f61968f7d7c2a4< 89771ce4f8f67dcffae561b2ccac95c0f6e3aa01 affected
fb4ca2b4bc6712a6ad635df5b9b41131846589f9 affected
3.16.50< 3.17 affected
4.13 affected
< 4.13 unaffected
6.18.59≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-99192

Vulnerability Information
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Vulnerability Title
net: bcmgenet: unshare the skb before writing the control block
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f48bed16a756f5bc0244acd581f61968f7d7c2a4 ~ 40c04abcbc34e3afe338f41dae851ecbd72852ac -
Linux Linux 4.13 -

II. Public POCs for CVE-2026-99192

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III. Intelligence Information for CVE-2026-99192

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Patches & Fixes for CVE-2026-99192 (3)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129 selinux: fix BPF token permission checks
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99150 drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux