CVE-2026-98251— openvswitch: avoid reallocating confirmed conntrack labels
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： openvswitch：避免对已确认的连接跟踪（conntrack）条目重新分配标签扩展 ovs_ct_get_conn_labels() 函数在 conntrack 条目尚无标签扩展时会添加该扩展。由于已确认状态的 conntrack 可以被无锁读取，此时添加扩展可能导致重新分配并释放扩展存储空间，而其他 CPU 正同时访问该扩展空间，从而引发竞争条件或数据不一致。 现仅对未确认状态的 conntrack 添加扩展。对于已确认状态但缺乏标签的 conntrack，其标签操
Possible ATT&CK Techniques 1 AI
T1564.001 · Hidden Files and DirectoriesAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c2ac667358708d7cce64c78f58af6adf4c1e848b< 4371d79ea74407fb992c985b1f94391e35bb8289 |
affected |
c2ac667358708d7cce64c78f58af6adf4c1e848b< 7ff688aceada1160331a789385ea146f62fbddf7 |
affected | ||
c2ac667358708d7cce64c78f58af6adf4c1e848b< 05eab8dced6bf4d3009a6eeee16ddac99047dc83 |
affected | ||
c2ac667358708d7cce64c78f58af6adf4c1e848b< 579d87ec1e1e85729a6cb2c25961e58beb78640c |
affected | ||
c2ac667358708d7cce64c78f58af6adf4c1e848b< 2e6dd889c325abf23821e1459c3ffef59b7f0009 |
affected | ||
c2ac667358708d7cce64c78f58af6adf4c1e848b< d16f089bd700f45d720ce989d5495e1dc3be0cf8 |
affected | ||
c2ac667358708d7cce64c78f58af6adf4c1e848b< 8c9fcc6c33950d3db551af664d1fd3d998bfee56 |
affected | ||
c2ac667358708d7cce64c78f58af6adf4c1e848b< 3f118c8217c109fd13ca61caa301d72c483897ef |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-98251
Vulnerability Information
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Vulnerability Title
openvswitch: avoid reallocating confirmed conntrack labels
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: avoid reallocating confirmed conntrack labels
ovs_ct_get_conn_labels() adds the labels extension when a conntrack
entry does not have one. Confirmed conntracks can be read locklessly,
so adding an extension may reallocate and free the extension block
while another CPU accesses it.
Only add the extension for unconfirmed conntracks. A confirmed
conntrack without labels now fails the caller's label operation instead
of reallocating its extension storage.
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
Affected Products
II. Public POCs for CVE-2026-98251
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-98251 (8)
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-2026-98276 | 7.8 HIGH | net: lock the socket in sock_gettstamp() |
| CVE-2026-98258 | 7.8 HIGH | posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list |
| CVE-2026-98260 | 7.8 HIGH | exec: Cleanup POSIX timers right after de_thread() |
| CVE-2026-98256 | 7.8 HIGH | signal: Prevent exec() race |
Showing top 20 of 208 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98374
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_s -
CVE-2026-98373
mm/hugetlb: preserve mremap address delta when skipping page -
CVE-2026-98372
xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk -
CVE-2026-98371
xfrm: iptfs: fix runt reassembly panic from short inner tot_ -
CVE-2026-98370
xfrm: fix compat ALLOCSPI request use-after-free
Same vendor: Linux
-
CVE-2026-98374
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_s -
CVE-2026-98373
mm/hugetlb: preserve mremap address delta when skipping page -
CVE-2026-98372
xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk -
CVE-2026-98371
xfrm: iptfs: fix runt reassembly panic from short inner tot_ -
CVE-2026-98370
xfrm: fix compat ALLOCSPI request use-after-free
V. Comments for CVE-2026-98251
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