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CVE-2026-98235— net/sched: act_api: release tail references on DELACTION failure

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.

在 Linux 内核中，已修复以下漏洞： net/sched: act_api: 在 DELACTION 操作失败时释放尾部引用 批量 RTM_DELACTION 请求会在尝试删除之前，对每个动作（action）保留一个临时引用。tcf_action_delete() 在尝试删除前，会清除已处理的每个槽位并释放其临时引用。如果删除失败，tcf_action_gd() 会调用 tcf_action_put_many() 来释放剩余的引用，但其内部的 tcf_act_for_each_action() 迭代器会在遇到第

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux a0e947c9ccffe47d45aca793d9e7fe4f4494e381< 9eaba16f1b6ee19b249e6afd82c27f958d441458 affected
a0e947c9ccffe47d45aca793d9e7fe4f4494e381< 1be63e4579af408d596f0f3165faf1a880631d3b affected
a0e947c9ccffe47d45aca793d9e7fe4f4494e381< 57b477e46ef2df3483f3488cc713c61c4b384aab affected
a0e947c9ccffe47d45aca793d9e7fe4f4494e381< 6e05e46fa821a5c1b281355f1f622ac76cb6080a affected
6.8 affected
< 6.8 unaffected
6.12.112≤ 6.12.* unaffected
6.18.54≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98235

Vulnerability Information
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Vulnerability Title
net/sched: act_api: release tail references on DELACTION failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: release tail references on DELACTION failure A batched RTM_DELACTION request takes a temporary reference on each action before attempting any deletion. tcf_action_delete() clears each processed slot and drops its temporary reference before attempting the deletion. If deletion fails, tca_action_gd() calls tcf_action_put_many() to release the remaining references, but its tcf_act_for_each_action() iterator stops at the first NULL slot. When a batch stops at an action bound to a filter, this leaks a reference on each subsequent action. A later delete of an unbound action can then return success without removing it from the IDR. Walk the full array in tcf_action_put_many() and skip NULL slots to release the references held on the unprocessed actions.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a0e947c9ccffe47d45aca793d9e7fe4f4494e381 ~ 9eaba16f1b6ee19b249e6afd82c27f958d441458 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-98235

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III. Intelligence Information for CVE-2026-98235

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Patches & Fixes for CVE-2026-98235 (4)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98254 7.8 HIGH swiotlb: use the adjusted address for the highmem page lookup

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98235

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