CVE-2026-53264— 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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net/sched/act_api中NEWTFILTER与DELFILTER并发运行时存在竞争条件，可能导致释放后重用。
已观察到在野利用
github_trending · low
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 98b2e40879abf0245be5a5b7af69e0f6ff524ac3 |
affected |
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 18af5d2ef0c4f65787fd1280c8b23286b9f2a835 |
affected | ||
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 1f1b98fea6b9ea30507d0f2fbff6750292d097e2 |
affected | ||
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 8b136f18ac4b2ace5aaad3305b3f8a5d8165a009 |
affected | ||
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 5dd51e09020c65aa53cf128e5e3517cd53b3c113 |
affected | ||
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< b60e9391142e983fab2be53497aa8f71fdd09cd5 |
affected | ||
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 91d105d2cbe002f9c7b43a6183adedc37e1da1f7 |
affected | ||
d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da< 5057e1aca011e51ef51498c940ef96f3d3e8a305 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-53264 基础信息
漏洞信息
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Vulnerability Title
net/sched: act_api: use RCU with deferred freeing for action lifecycle
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_api: use RCU with deferred freeing for action lifecycle
When NEWTFILTER and DELFILTER are run concurrently it is possible to create a
race with an associated action.
Let's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER:
0: mutex_lock() <-- holds the idr lock
0: rcu_read_lock()
0: p = idr_find(idr, index) <-- action p is valid (RCU protects IDR)
0: mutex_unlock() <-- releases the idr lock
1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held
1: idr_remove(idr, index) <-- Action removed from IDR
1: mutex_unlock() <-- mutex released allowing us to delete the action
1: tcf_action_cleanup(p); kfree(p) <-- Kfrees p immediately, no deferral
0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- ouch, UAF p points to freed memory
This patch fixes the race condition between NEWTFILTER and DELFILTER by
adding struct rcu_head to tc_action used in the deferral and introducing a
call_rcu() in the delete path to defer the final kfree().
Note: this is a revert of commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu")
but also modernization/simplification to directly use kfree_rcu().
Let's illustrate the new restored code path:
0: rcu_read_lock()
1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held
1: idr_remove(idr, index)
1: mutex_unlock()
1: call_rcu(&p->tcfa_rcu, tcf_action_rcu_free) <-- defer kfree after grace period
0: p = idr_find(idr, index)
0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- fails, refcnt already 0
1: rcu_read_unlock() <-- release so freeing can run after grace period
After CPU1 calls idr_remove(), the object is no longer reachable through the IDR.
CPU0's subsequent idr_find() will return NULL, and even if it still held a
stale pointer, the immediate kfree() is now deferred until after the RCU grace
period, so no UAF can occur.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net/sched/act_api中NEWTFILTER与DELFILTER并发运行时存在竞争条件，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-2026-53264 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-53264 补丁与修复 (8)
同批安全公告 · Linux · 2026-06-25 · 共 146 条
| CVE-2026-53175 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53176 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53228 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53221 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53246 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53247 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53151 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53216 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53260 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53215 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53131 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53225 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53224 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53186 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53159 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53198 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53240 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53275 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53188 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53171 | 8.8 HIGH | Linux kernel 安全漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-53264
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