CVE-2026-98393— net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
In the Linux kernel, the following vulnerability has been resolved: net: ipv4: Fix UDP length overflow with PMTU discover and big MTU This commit bounds cork->base.fragsize to IP_MAX_MTU to avoid a possible overflow of UDP length that triggers a WARN in udp_se
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | daba287b299ec7a2c61ae3a714920e90e8396ad5< 83fedc4741210f75be8ca5b487985a242bf6f18d |
affected |
daba287b299ec7a2c61ae3a714920e90e8396ad5< 81f540827d243b8dad76c1f44e70ea31719f393c |
affected | ||
daba287b299ec7a2c61ae3a714920e90e8396ad5< b83641e0ab8b20eefcc4cdc5a059f897375291a2 |
affected | ||
3.13 |
affected | ||
< 3.13 |
unaffected | ||
6.18.53≤ 6.18.* |
unaffected | ||
7.2.7≤ 7.2.* |
unaffected | ||
7.3-rc3≤ * |
unaffected |
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一、 漏洞 CVE-2026-98393 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
This commit bounds cork->base.fragsize to IP_MAX_MTU to avoid a
possible overflow of UDP length that triggers a WARN in
udp_set_len_short when setsockopt IP_MTU_DISCOVER is set to
IP_PMTUDISC_PROBE, and a large packet is sent over a netdev with an
unusually large MTU.
Steps to reproduce:
1. Set device MTU bigger than IP_MAX_MTU + 20. cork->base.fragsize will
be set to that MTU in ip_setup_cork.
2. Set IP_MTU_DISCOVER to IP_PMTUDISC_PROBE. It lets maxnonfragsize be
set to device MTU (cork->fragsize) in __ip_append_data, rather than
to IP_MAX_MTU.
3. Send 65528 bytes of payload (+8 bytes of UDP header, +20 bytes of
IPv4 header). Device MTU allows it (it's only one byte bigger than
IP_MAX_MTU + IPv4 header, and the device MTU is bigger than that).
4. The UDP length in the built packet is 65536, which overflows the
16-bit length field and triggers the WARN in udp_set_len_short.
Note: IP_PMTUDISC_DO with IPv4 is safe, because ip_dst_mtu_maybe_forward
always clamps at IP_MAX_MTU, unlike ip6_dst_mtu_maybe_forward.
The Fixes tag points at the first commit where I could reproduce the
overflow with IPv4 and IP_PMTUDISC_PROBE.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-98393 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-98393 其他参考 (3)
同批安全公告 · Linux · 2026-10-14 · 共 46 条
| CVE-2026-98399 | s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block | |
| CVE-2026-98395 | powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit | |
| CVE-2026-98394 | af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer. | |
| CVE-2026-98391 | drm/xe: Guard page-fault worker with runtime PM check | |
| CVE-2026-98389 | drm/amdgpu: skip gfx switch_power_profile during GPU reset | |
| CVE-2026-98388 | exec: do_close_on_exec() before taking exec_update_lock | |
| CVE-2026-98387 | s390/crypto: Fix skcipher_walk return code handling in aes_s390 | |
| CVE-2026-98386 | scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot | |
| CVE-2026-98390 | x86/amd_node: Avoid divide by zero on virtualized systems | |
| CVE-2026-98398 | locking/lockdep: Invalidate stale class_cache entries for zapped classes | |
| CVE-2026-98397 | platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown | |
| CVE-2026-98400 | s390/ipl: Fix NULL deref in kdump without re-IPL parm block | |
| CVE-2026-98402 | net: icmp: avoid invalid transport header access in icmp_send tracepoint | |
| CVE-2026-98401 | net: iptunnel: fix stale transport header during tunnel decapsulation | |
| CVE-2026-98403 | s390/boot: Avoid IPL parameter append past command line | |
| CVE-2026-98404 | drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create() | |
| CVE-2026-98405 | smb: client: fix missing iov bounds check in parse_posix_sids() | |
| CVE-2026-98406 | wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver | |
| CVE-2026-98408 | watchdog: rzv2h: Avoid division by zero | |
| CVE-2026-98407 | wifi: rsi: fix heap OOB write on key removal |
显示前 20 条，共 46 条。 查看全部 → →
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V. Comments for CVE-2026-98393
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