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CVE-2026-23204— net/sched: cls_u32: use skb_header_pointer_careful()

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cls_u32分类器使用skb_header_pointer函数验证不足，可能导致越界读取。

CVSS 7.1 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< 66e4b63d61c15de6ca5332d9ca6db59a404d7136 affected
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< 29681ed51e737be14d18ecd1c304c57002e4b72c affected
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< cfa745830e45ecb75c061aa34330ee0cac941cc7 affected
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< 13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 affected
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< e41a23e61259f5526af875c3b86b3d42a9bae0e5 affected
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< 8a672f177ebe19c93d795fbe967846084fbc7943 affected
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d< cabd1a976375780dabab888784e356f574bbaed8 affected
2.6.35 affected
… +8 more rows
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I. Basic Information for CVE-2026-23204

Vulnerability Information
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Vulnerability Title
net/sched: cls_u32: use skb_header_pointer_careful()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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cls_u32分类器使用skb_header_pointer函数验证不足，可能导致越界读取。
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 fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d ~ 66e4b63d61c15de6ca5332d9ca6db59a404d7136 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2026-23204

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III. Intelligence Information for CVE-2026-23204

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Patches & Fixes for CVE-2026-23204 (1)

Same Patch Batch · Linux · 2026-02-14 · 108 CVEs total

CVE-2025-71202 8.8 HIGH iommu/sva: invalidate stale IOTLB entries for kernel address space
CVE-2026-23193 8.8 HIGH scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()
CVE-2026-23172 8.4 HIGH net: wwan: t7xx: fix potential skb->frags overflow in RX path
CVE-2026-23209 7.8 HIGH macvlan: fix error recovery in macvlan_common_newlink()
CVE-2026-23169 7.8 HIGH mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()
CVE-2026-23171 7.8 HIGH bonding: fix use-after-free due to enslave fail after slave array update
CVE-2025-71221 7.8 HIGH dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()
CVE-2026-23178 7.8 HIGH HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()
CVE-2026-23184 7.8 HIGH binder: fix UAF in binder_netlink_report()
CVE-2026-23185 7.8 HIGH wifi: iwlwifi: mld: cancel mlo_scan_start_wk
CVE-2026-23191 7.8 HIGH ALSA: aloop: Fix racy access at PCM trigger
CVE-2026-23192 7.8 HIGH linkwatch: use __dev_put() in callers to prevent UAF
CVE-2026-23198 7.8 HIGH KVM: Don't clobber irqfd routing type when deassigning irqfd
CVE-2025-71204 7.5 HIGH smb/server: fix refcount leak in parse_durable_handle_context()
CVE-2026-23148 7.5 HIGH nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
CVE-2026-23136 7.5 HIGH libceph: reset sparse-read state in osd_fault()
CVE-2026-23139 7.5 HIGH netfilter: nf_conncount: update last_gc only when GC has been performed
CVE-2026-23161 7.3 HIGH mm/shmem, swap: fix race of truncate and swap entry split
CVE-2025-71201 7.1 HIGH netfs: Fix early read unlock of page with EOF in middle
CVE-2026-23175 7.0 HIGH net: cpsw: Execute ndo_set_rx_mode callback in a work queue

Showing top 20 of 108 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23204

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