CVE-2026-45845— 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net/sched taprio模块在类转储时未对已删除的子qdisc进行空指针检查，可能导致空指针解引用。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 665338b2a7a0139337d1f85be65ed16e487f84c1< ec2501e361b08b50bcb1e7b3253fc861abbda28d |
affected |
665338b2a7a0139337d1f85be65ed16e487f84c1< d02e2fbf60de46678e2ea698a6a904fd21e1cc31 |
affected | ||
665338b2a7a0139337d1f85be65ed16e487f84c1< 48b26d48e76221dc90b02bf5428bab53643461ca |
affected | ||
665338b2a7a0139337d1f85be65ed16e487f84c1< 8f1ff8866cb9f655e5faea6994eb902960be8e04 |
affected | ||
665338b2a7a0139337d1f85be65ed16e487f84c1< 3d07ca5c0fae311226f737963984bd94bb159a87 |
affected | ||
6.6 |
affected | ||
< 6.6 |
unaffected | ||
6.6.141≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-45845 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！
查看神龙十问 ↗
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/sched: taprio: fix NULL pointer dereference in class dump
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: taprio: fix NULL pointer dereference in class dump
When a TAPRIO child qdisc is deleted via RTM_DELQDISC, taprio_graft()
is called with new == NULL and stores NULL into q->qdiscs[cl - 1].
Subsequent RTM_GETTCLASS dump operations walk all classes via
taprio_walk() and call taprio_dump_class(), which calls taprio_leaf()
returning the NULL pointer, then dereferences it to read child->handle,
causing a kernel NULL pointer dereference.
The bug is reachable with namespace-scoped CAP_NET_ADMIN on any kernel
with CONFIG_NET_SCH_TAPRIO enabled. On systems with unprivileged user
namespaces enabled, an unprivileged local user can trigger a kernel
panic by creating a taprio qdisc inside a new network namespace,
grafting an explicit child qdisc, deleting it, and requesting a class
dump. The RTM_GETTCLASS dump itself requires no capability.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
RIP: 0010:taprio_dump_class (net/sched/sch_taprio.c:2478)
Call Trace:
<TASK>
tc_fill_tclass (net/sched/sch_api.c:1966)
qdisc_class_dump (net/sched/sch_api.c:2326)
taprio_walk (net/sched/sch_taprio.c:2514)
tc_dump_tclass_qdisc (net/sched/sch_api.c:2352)
tc_dump_tclass_root (net/sched/sch_api.c:2370)
tc_dump_tclass (net/sched/sch_api.c:2431)
rtnl_dumpit (net/core/rtnetlink.c:6864)
netlink_dump (net/netlink/af_netlink.c:2325)
rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
netlink_rcv_skb (net/netlink/af_netlink.c:2550)
</TASK>
Fix this by substituting &noop_qdisc when new is NULL in
taprio_graft(), a common pattern used by other qdiscs (e.g.,
multiq_graft()) to ensure the q->qdiscs[] slots are never NULL.
This makes control-plane dump paths safe without requiring individual
NULL checks.
Since the data-plane paths (taprio_enqueue and taprio_dequeue_from_txq)
previously had explicit NULL guards that would drop/skip the packet
cleanly, update those checks to test for &noop_qdisc instead. Without
this, packets would reach taprio_enqueue_one() which increments the root
qdisc's qlen and backlog before calling the child's enqueue; noop_qdisc
drops the packet but those counters are never rolled back, permanently
inflating the root qdisc's statistics.
After this change *old can be a valid qdisc, NULL, or &noop_qdisc.
Only call qdisc_put(*old) in the first case to avoid decreasing
noop_qdisc's refcount, which was never increased.
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
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net/sched taprio模块在类转储时未对已删除的子qdisc进行空指针检查，可能导致空指针解引用。
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-2026-45845 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-45845 的情报信息
请登录查看更多情报信息。
CVE-2026-45845 补丁与修复 (4)
同批安全公告 · Linux · 2026-05-27 · 共 275 条
| CVE-2026-46039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45898 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45972 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45988 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46043 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46056 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71311 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46037 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45843 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46010 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46099 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46076 | 7.9 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45910 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45931 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45956 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46036 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46100 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45894 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45933 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 275 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-45845
暂无评论