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CVE-2026-74290— net/sched: cls_flow: Dont expose folded kernel pointers

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于flow classifier在处理缺失字段时使用addr_fold()折叠指针，在map模式下用户空间可控制参数并通过class statistics观察结果，导致用户/网络命名空间中的tc分类器能够恢复内核指针折叠值，造成信息泄露。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.17% · P7

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux e5dfb815181fcb186d6080ac3a091eadff2d98fe< 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 affected
e5dfb815181fcb186d6080ac3a091eadff2d98fe< 3d054001860270748405a3f9270c5fa0bf7ffc19 affected
e5dfb815181fcb186d6080ac3a091eadff2d98fe< fb31fbe51c233f3bf47021121f63d2e42cac2d08 affected
e5dfb815181fcb186d6080ac3a091eadff2d98fe< 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a affected
e5dfb815181fcb186d6080ac3a091eadff2d98fe< 6151159618198675e01c391676e579738286c135 affected
e5dfb815181fcb186d6080ac3a091eadff2d98fe< f294fc71c4a0fa4964f6428a1b4e7929c1d83125 affected
2.6.25 affected
< 2.6.25 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74290

Vulnerability Information
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Vulnerability Title
net/sched: cls_flow: Dont expose folded kernel pointers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: Dont expose folded kernel pointers The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct(). Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)
Source: CVE Program / CVE List V5
CVSS Information
N/A
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于flow classifier在处理缺失字段时使用addr_fold()折叠指针，在map模式下用户空间可控制参数并通过class statistics观察结果，导致用户/网络命名空间中的tc分类器能够恢复内核指针折叠值，造成信息泄露。
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 e5dfb815181fcb186d6080ac3a091eadff2d98fe ~ 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 -
Linux Linux 2.6.25 -

II. Public POCs for CVE-2026-74290

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III. Intelligence Information for CVE-2026-74290

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Patches & Fixes for CVE-2026-74290 (6)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72381 9.8 CRITICAL ksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74406 9.8 CRITICAL vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-72139 9.8 CRITICAL tcp: defer md5sig_info kfree past RCU grace period in tcp_connect
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-72137 9.8 CRITICAL xfrm: nat_keepalive: avoid double free on send error
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72130 9.8 CRITICAL nvmet-auth: reject short AUTH_RECEIVE buffers

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74290

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