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CVE-2026-23245— net/sched: act_gate: snapshot parameters with RCU on replace

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.

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act_gate操作在替换时未对参数进行RCU快照保护，可能导致竞争条件。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux a51c328df3106663879645680609eb49b3ff6444< fc98fd8d214693be91253d9a88cdf8e5e143d124 affected
a51c328df3106663879645680609eb49b3ff6444< 8b1251bbf0f10ac745ed74bad4d3b433caa1eeae affected
a51c328df3106663879645680609eb49b3ff6444< dfc314d7c767e350f78a46a8f8b134f80e8ad432 affected
a51c328df3106663879645680609eb49b3ff6444< 035d0d09d5ab3ed3e93d18cde2b562a6719eea23 affected
a51c328df3106663879645680609eb49b3ff6444< 04d75529dc0f9be78786162ebab7424af4644df2 affected
a51c328df3106663879645680609eb49b3ff6444< 58b162e318d0243ad2d7d92456c0873f2494c351 affected
a51c328df3106663879645680609eb49b3ff6444< 62413a9c3cb183afb9bb6e94dd68caf4e4145f4c affected
5.8 affected
… +8 more rows
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I. Basic Information for CVE-2026-23245

Vulnerability Information
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Vulnerability Title
net/sched: act_gate: snapshot parameters with RCU on replace
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_gate: snapshot parameters with RCU on replace The gate action can be replaced while the hrtimer callback or dump path is walking the schedule list. Convert the parameters to an RCU-protected snapshot and swap updates under tcf_lock, freeing the previous snapshot via call_rcu(). When REPLACE omits the entry list, preserve the existing schedule so the effective state is unchanged.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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act_gate操作在替换时未对参数进行RCU快照保护，可能导致竞争条件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a51c328df3106663879645680609eb49b3ff6444 ~ fc98fd8d214693be91253d9a88cdf8e5e143d124 -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-23245

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III. Intelligence Information for CVE-2026-23245

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Patches & Fixes for CVE-2026-23245 (6)

Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

CVE-2026-23246 8.8 HIGH wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
CVE-2026-23268 7.8 HIGH apparmor: fix unprivileged local user can do privileged policy management
CVE-2026-23270 7.8 HIGH net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
CVE-2026-23253 7.8 HIGH media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
CVE-2026-23248 7.8 HIGH perf/core: Fix refcount bug and potential UAF in perf_mmap
CVE-2026-23243 7.8 HIGH RDMA/umad: Reject negative data_len in ib_umad_write
CVE-2025-71269 7.5 HIGH btrfs: do not free data reservation in fallback from inline due to -ENOSPC
CVE-2025-71268 7.5 HIGH btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2026-23242 7.5 HIGH RDMA/siw: Fix potential NULL pointer dereference in header processing
CVE-2026-23269 7.1 HIGH apparmor: validate DFA start states are in bounds in unpack_pdb
CVE-2026-23244 nvme: fix memory allocation in nvme_pr_read_keys()
CVE-2026-23247 tcp: secure_seq: add back ports to TS offset
CVE-2025-71267 fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST
CVE-2026-23249 xfs: check for deleted cursors when revalidating two btrees
CVE-2026-23250 xfs: check return value of xchk_scrub_create_subord
CVE-2026-23251 xfs: only call xf{array,blob}_destroy if we have a valid pointer
CVE-2026-23252 xfs: get rid of the xchk_xfile_*_descr calls
CVE-2025-71266 fs: ntfs3: check return value of indx_find to avoid infinite loop
CVE-2025-71265 fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71270 LoongArch: Enable exception fixup for specific ADE subcode

Showing top 20 of 35 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23245

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