CVE-2026-98025— net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow
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，已修复以下漏洞： net: usb: cx82310_eth：在 0xffff 重启哨兵后丢弃 URB，以防止 partial_data 堆溢出 长度值为 的哨兵用于检测路由器重启事件，并调度重新启用以太网模式。然而，代码随后会穿透（fall through）进入循环体的剩余部分。接下来的检查是： 这是之前匹配到的 语句的 分支——当 时，该条件永远不会触发。因此，通常用于限制不完整数据包保存路径的 MTU 边界检查被悄然绕过。 由于 为 4096， 恒成立。在不完整数据包分支中，会将 个字
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1203 · Exploitation for Client ExecutionAffected Version Matrix 22
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< d0c1ce6ef4cefe568e19afa83f543caa3c3c0873 |
affected |
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 0dbc89e664b4609ad672b5bdeef60df251294b8f |
affected | ||
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 00520cdd21ea6a9b5dc8d53bbd241620d2059554 |
affected | ||
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 59bf9e94bdc49557f07d87164269daff7340f4d6 |
affected | ||
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287 |
affected | ||
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 659654654eb140851467af41d610473c100c7975 |
affected | ||
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 237c9ae7145772af147e4665f158938350fa5658 |
affected | ||
ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808< 5d50e90add8b4a978395e893e81954d19d58a7c5 |
affected | ||
| … +14 more rows | |||
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I. Basic Information for CVE-2026-98025
Vulnerability Information
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Vulnerability Title
net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow
The 0xffff length sentinel detects a router reboot and schedules
re-enabling of ethernet mode, but then falls through to the rest
of the loop body. The next check is
} else if (len > CX82310_MTU) {
which is the else of the just-matched if -- it never fires for
len == 0xffff. The MTU bound that normally caps the
incomplete-packet save path is silently bypassed.
With 0xffff > skb->len always true (rx_urb_size is 4096), the
incomplete-packet branch saves dev->partial_len = skb->len bytes
into dev->partial_data. partial_data is kmalloc(hard_mtu) =
kmalloc(CX82310_MTU + 2) = 1516 bytes, but skb->len after the
2-byte header pull can be up to 4094. A device that sends a
4096-byte URB starting with [0xff 0xff] therefore copies 4094
device-provided bytes into a buffer allocated for 1516 bytes,
exceeding its requested size by 2578 bytes.
The next URB then reads dev->partial_len (4094) back from the same
1516-byte buffer and dev->partial_rem (65535 - 4094 = 61441) from
the new URB's ~4KB skb, both well past their allocations, and
delivers the spliced result as a 64KB "frame" to the network
stack.
Bail out of rx_fixup after scheduling the re-enable work; the
remainder of a reboot-marker URB is not meaningful packet data.
This restores the invariant that partial_len < CX82310_MTU + 2 on
the save path, since every other route there has already passed
the MTU check.
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
II. Public POCs for CVE-2026-98025
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-98025 (8)
Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total
| CVE-2026-100075 | 9.8 CRITICAL | RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters |
| CVE-2026-97555 | 8.8 HIGH | smb: client: fix heap overflow in DACL owner/group rewrite |
| CVE-2026-97957 | 8.8 HIGH | net: hinic: fix mailbox segment buffer overflow |
| CVE-2026-97527 | 8.8 HIGH | scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock |
| CVE-2026-97528 | 8.8 HIGH | scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error |
| CVE-2026-98115 | 8.8 HIGH | ksmbd: safely drain sessions during logoff |
| CVE-2026-97525 | 8.2 HIGH | x86/mm/pat: Allocate split page tables as kernel page tables |
| CVE-2026-98069 | 8.1 HIGH | net/rds: acquire the fastpath locks in rds_conn_shutdown() |
| CVE-2026-97573 | 8.1 HIGH | bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset() |
| CVE-2026-97570 | 8.1 HIGH | bnxt_en: Bound SW TPA IDs to prevent crashes |
| CVE-2026-98130 | 8.1 HIGH | sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START |
| CVE-2026-98070 | 8.1 HIGH | net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks() |
| CVE-2026-98002 | 7.8 HIGH | iommu/amd: Fix ineffective error check in nested domain allocation |
| CVE-2026-97575 | 7.8 HIGH | media: v4l2-ctrls: validate AV1 tile counts |
| CVE-2026-97576 | 7.8 HIGH | media: v4l2-ctrls: validate HEVC tile counts |
| CVE-2026-97941 | 7.8 HIGH | mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race |
| CVE-2026-98112 | 7.8 HIGH | ksmbd: fix listener task lifetime on netdev events |
| CVE-2026-97937 | 7.8 HIGH | ftrace: fork: Initialize function graph state before copy_exec_state() |
| CVE-2026-97580 | 7.8 HIGH | media: rkvdec: bound HEVC tile loops and PPS id to the array capacity |
| CVE-2026-97940 | 7.8 HIGH | ipv6: fix fib6 walker UAF on seq stop |
Showing top 20 of 372 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-98025
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