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CVE-2026-98487— net: bridge: mdb: restart port group walk after deletion

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: bridge: mdb: 在删除操作后重启端口组遍历 在遍历 时维护了一个指向指针的游标。而 可以通过 重新进入同一个 MDB 条目，并解除其他端口组的链接。如果该游标恰好指向其中某个被解除链接的组，则下一次迭代将解引用一个过时的游标，导致 指向已被释放的内存。 随后执行的 操作会暴露这一悬空指针： 修复方案：在每次删除操作后，将游标重置为 。由于删除操作至少会移除所选的组，因此重启遍历始终能取得进展，避免陷入无效状态。

CVSS 7.8 · High EPSS 0.16% · P6

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux a6acb535afb2a3b688a7858f05b61f0433e480d5< 46ec55855c972504258c371677ac039ba20e5d12 affected
a6acb535afb2a3b688a7858f05b61f0433e480d5< ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe affected
a6acb535afb2a3b688a7858f05b61f0433e480d5< fe2a42789c12eb7c5d3a42191e2cc735a6c35ead affected
a6acb535afb2a3b688a7858f05b61f0433e480d5< ab1404ac81154a89fb61ac50ae9a04cd8d4834dc affected
6.8 affected
< 6.8 unaffected
6.12.112≤ 6.12.* unaffected
6.18.55≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98487

Vulnerability Information
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Vulnerability Title
net: bridge: mdb: restart port group walk after deletion
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: bridge: mdb: restart port group walk after deletion br_mdb_flush_pgs() keeps a pointer-to-pointer cursor while walking mp->ports. br_multicast_del_pg() can re-enter the same MDB entry through br_multicast_sg_del_exclude_ports() and unlink other port groups. If the cursor points into one of those groups, the next iteration dereferences a stale cursor and can leave mp->ports pointing at freed memory. A following RTM_GETMDB exposes the dangling pointer: BUG: KASAN: slab-use-after-free in br_mdb_dump Read of size 8 br_mdb_dump rtnl_mdb_dump rtnl_dumpit netlink_dump Reset the cursor to mp->ports after every deletion. The deletion removes at least the selected group, so the restarted walk always makes progress.
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 a6acb535afb2a3b688a7858f05b61f0433e480d5 ~ 46ec55855c972504258c371677ac039ba20e5d12 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-98487

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III. Intelligence Information for CVE-2026-98487

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Patches & Fixes for CVE-2026-98487 (4)

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

CVE-2026-98490 9.8 CRITICAL net: openvswitch: conntrack: fix helper UAF due to extensions realloc
CVE-2026-98548 9.8 CRITICAL sctp: discard the rest of the packet on a stale-cookie error
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-2026-98436 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-2026-98515 7.8 HIGH drm/nouveau: fix double-free in nvif_vmm_dtor
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-2026-98491 7.8 HIGH net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux