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CVE-2026-98491— net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

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，以下漏洞已得到修复： net: openvswitch: conntrack: 避免修改共享的未确认 conntrack 条目 当带有未确认 conntrack（ct）条目的 sk_buff（skb）被克隆时，可能会导致两个克隆体都被提交，但各自携带不同的扩展字段集合，从而引发问题。 具体事件序列如下： 1. 第一个克隆体尝试提交，并运行辅助程序（helpers），将扩展指针链接到期望（expectation）列表中。 2. 随后，该克隆体失去确认状态，使条目保持未确认。 3. 第二个克隆体

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cae3a2627520c3795b54533c5328b77af3405dbe< e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d affected
cae3a2627520c3795b54533c5328b77af3405dbe< 37e3c878b183a115f9a114067f9ef3b408ad27fb affected
cae3a2627520c3795b54533c5328b77af3405dbe< 707c2dc77891a874f4e8c52c285a511079164ec8 affected
cae3a2627520c3795b54533c5328b77af3405dbe< de41ee24f77b0fc45397db3e277cae2adbd43dfe affected
cae3a2627520c3795b54533c5328b77af3405dbe< 55e5256adf3940e71802e2f749cacf81518726b0 affected
cae3a2627520c3795b54533c5328b77af3405dbe< e2829ae5459ddb5fce526b2e84697edf6c0c3cef affected
cae3a2627520c3795b54533c5328b77af3405dbe< 457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55 affected
cae3a2627520c3795b54533c5328b77af3405dbe< 26b2bd70d22457556e2fa01cbf1192cb1a94d619 affected
… +10 more rows
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I. Basic Information for CVE-2026-98491

Vulnerability Information
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Vulnerability Title
net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry In a case where skb with an unconfirmed ct entry gets cloned, we may end up committing both but with different sets of extensions. The series of events: 1. The first clone wants to commit and runs the helpers wiring up the extension pointer into the expectation list. 2. Then it looses the confirmation keeping the entry unconfirmed. 3. Second clone now wants to commit labels and adds the new extension for that breaking the pointer in the expectation list causing UAF on the destruction path later. While this is possible to trigger, there should be no practical network pipeline where committing both clones without modifications into the same zone is needed. So, let's just reset the entry in case for some reason we got an skb with a shared one during commit. This doesn't affect any known use cases, but avoids any potential problems with sharing and modification of the unconfirmed ct entry. The fixes tag points to the introduction of helpers, since that's the main UAF trigger for the sharing.
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux cae3a2627520c3795b54533c5328b77af3405dbe ~ e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d -
Linux Linux 4.3 -

II. Public POCs for CVE-2026-98491

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III. Intelligence Information for CVE-2026-98491

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Patches & Fixes for CVE-2026-98491 (7)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98548 9.8 CRITICAL sctp: discard the rest of the packet on a stale-cookie error
CVE-2026-98490 9.8 CRITICAL net: openvswitch: conntrack: fix helper UAF due to extensions realloc
CVE-2026-98464 9.3 CRITICAL RISC-V: KVM: Synchronize hrtimer callback during teardown
CVE-2026-98549 9.1 CRITICAL tcp: prevent collapsing skbs across boundary in rtx queue
CVE-2026-98451 8.8 HIGH smb: client: use finish_no_open() for non-regular inodes
CVE-2026-98466 8.2 HIGH KVM: arm64: Transfer the hyp stack pages out of the host stage-2
CVE-2026-98454 8.1 HIGH smb: client: fix create context out-of-bounds reads
CVE-2026-98499 8.1 HIGH HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
CVE-2026-98532 8.1 HIGH ipv6: do not let ipv6_find_hdr() return an offset past the packet end
CVE-2026-98507 7.8 HIGH mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish
CVE-2026-98524 7.8 HIGH rds: ib: Clear the sg list when mapping an MR fails
CVE-2026-98520 7.8 HIGH drm/amdkfd: fix use-after-free and multi-container gap in kfd_dev_mapping
CVE-2026-98517 7.8 HIGH drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM
CVE-2026-98443 7.8 HIGH xfs: fix cursor and pointer handling when recovering iunlink buckets
CVE-2026-98487 7.8 HIGH net: bridge: mdb: restart port group walk after deletion
CVE-2026-98436 7.8 HIGH accel/amdxdna: Disable device buffer exporting
CVE-2026-98510 7.8 HIGH drm/xe/vm: nuke PTs only after unlinking contested VMAs
CVE-2026-98441 7.8 HIGH net/sched: act_ct: avoid modifying shared unconfirmed ct entry
CVE-2026-98442 7.8 HIGH net/sched: act_ct: fix helper UAF due to extensions realloc
CVE-2026-98515 7.8 HIGH drm/nouveau: fix double-free in nvif_vmm_dtor

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux