CVE-2026-31469— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于网络命名空间销毁时未正确处理skb引用，可能导致释放后重用。
可能的 ATT&CK 技术 1 AI
T1562.001影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f2fc6a54585a1be6669613a31fbaba2ecbadcd36< be0e63f3b97bbaf453c542e8a15ba2a536e2ac01 |
affected |
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< c1ec36cb3768574b916f20d2d7415fd14fa1bf12 |
affected | ||
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< 8a4790850e710fd6771e4d2112168ed1dd6c0e54 |
affected | ||
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< fedd2e1630cac920844997227ccbe7b26a76375a |
affected | ||
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< f04733c4dc40c43899c3d1c97afbae5831a3770f |
affected | ||
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< 9a18629f2525781f0f3dda7be72b204e4cf77d08 |
affected | ||
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< 63d45077b97bb0e0fe0c75931acbbca7a47af141 |
affected | ||
f2fc6a54585a1be6669613a31fbaba2ecbadcd36< ba8bda9a0896746053aa97ac6c3e08168729172c |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-31469 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false
A UAF issue occurs when the virtio_net driver is configured with napi_tx=N
and the device's IFF_XMIT_DST_RELEASE flag is cleared
(e.g., during the configuration of tc route filter rules).
When IFF_XMIT_DST_RELEASE is removed from the net_device, the network stack
expects the driver to hold the reference to skb->dst until the packet
is fully transmitted and freed. In virtio_net with napi_tx=N,
skbs may remain in the virtio transmit ring for an extended period.
If the network namespace is destroyed while these skbs are still pending,
the corresponding dst_ops structure has freed. When a subsequent packet
is transmitted, free_old_xmit() is triggered to clean up old skbs.
It then calls dst_release() on the skb associated with the stale dst_entry.
Since the dst_ops (referenced by the dst_entry) has already been freed,
a UAF kernel paging request occurs.
fix it by adds skb_dst_drop(skb) in start_xmit to explicitly release
the dst reference before the skb is queued in virtio_net.
Call Trace:
Unable to handle kernel paging request at virtual address ffff80007e150000
CPU: 2 UID: 0 PID: 6236 Comm: ping Kdump: loaded Not tainted 7.0.0-rc1+ #6 PREEMPT
...
percpu_counter_add_batch+0x3c/0x158 lib/percpu_counter.c:98 (P)
dst_release+0xe0/0x110 net/core/dst.c:177
skb_release_head_state+0xe8/0x108 net/core/skbuff.c:1177
sk_skb_reason_drop+0x54/0x2d8 net/core/skbuff.c:1255
dev_kfree_skb_any_reason+0x64/0x78 net/core/dev.c:3469
napi_consume_skb+0x1c4/0x3a0 net/core/skbuff.c:1527
__free_old_xmit+0x164/0x230 drivers/net/virtio_net.c:611 [virtio_net]
free_old_xmit drivers/net/virtio_net.c:1081 [virtio_net]
start_xmit+0x7c/0x530 drivers/net/virtio_net.c:3329 [virtio_net]
...
Reproduction Steps:
NETDEV="enp3s0"
config_qdisc_route_filter() {
tc qdisc del dev $NETDEV root
tc qdisc add dev $NETDEV root handle 1: prio
tc filter add dev $NETDEV parent 1:0 \
protocol ip prio 100 route to 100 flowid 1:1
ip route add 192.168.1.100/32 dev $NETDEV realm 100
}
test_ns() {
ip netns add testns
ip link set $NETDEV netns testns
ip netns exec testns ifconfig $NETDEV 10.0.32.46/24
ip netns exec testns ping -c 1 10.0.32.1
ip netns del testns
}
config_qdisc_route_filter
test_ns
sleep 2
test_ns
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于网络命名空间销毁时未正确处理skb引用，可能导致释放后重用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-31469 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-04-22 · 共 100 条
| CVE-2026-31501 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31444 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31436 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31463 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31478 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31448 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31432 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31433 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31450 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31435 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31476 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31464 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31513 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31471 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31453 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31473 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31449 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31454 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31502 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31468 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 100 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31469
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