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CVE-2026-98598— ipv6: Prevent rt6_insert_exception() for dying fib6_info.

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： ipv6：防止在 dying（即将销毁）的 fib6_info 上调用 rt6_insert_exception()。 在引用提交之前， 函数始终会在 保护下将 设置为 1，以此阻止 为即将销毁的 插入新的异常路由。 随后，该标志位被替换为存储在 中的 位。 问题在于：现在该比特位仅在 bucket 非空且 从 调用（此时 计数已降为零）时才会被设置。 如果 在目标 正通过 被移除的过程中被调用，则可能成功创建新的异常路由，因为此时 不再设置该比特位。 这导致 与异常路

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux cc5c073a693fa6ed7a207b0436114f68cce72434< 649ffc76ed5483b2caf35ed90d3787538efc4e53 affected
cc5c073a693fa6ed7a207b0436114f68cce72434< e03e77071e75ce726d877f0a4349a28b6e1f487a affected
cc5c073a693fa6ed7a207b0436114f68cce72434< 0346ec2f080b40d95ed05b853bb9226289e75212 affected
5.3 affected
< 5.3 unaffected
6.18.55≤ 6.18.* unaffected
7.2.9≤ 7.2.* unaffected
7.3-rc5≤ * unaffected
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I. Basic Information for CVE-2026-98598

Vulnerability Information
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Vulnerability Title
ipv6: Prevent rt6_insert_exception() for dying fib6_info.
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: Prevent rt6_insert_exception() for dying fib6_info. Before the cited commit, fib6_nh_flush_exceptions() always set from->exception_bucket_flushed = 1 under rt6_exception_lock to prevent rt6_insert_exception() from inserting a new exception for a dying fib6_info. The flag was replaced with the FIB6_EXCEPTION_BUCKET_FLUSHED bit stored in nh->rt6i_exception_bucket. The problem is that now the bit is only set when the bucket is not NULL and fib6_nh_flush_exceptions() is called from fib6_nh_release() after fib6_ref has already reached zero. If rt6_insert_exception() is called while the target fib6_info is being removed via fib6_purge_rt(), a new exception could be created successfully because rt6_flush_exceptions() no longer sets the bit. This creates a reference cycle between the fib6_info and the exception route, leaking the fib6_info, its nexthop device, and all per-CPU routes in fib6_nh->rt6i_pcpu, which stalls netdev unregistration. [ 34.680602] unregister_netdevice: waiting for gre6 to become free. Usage count = 68 [ 44.920675] unregister_netdevice: waiting for gre6 to become free. Usage count = 68 [ 55.176582] unregister_netdevice: waiting for gre6 to become free. Usage count = 68 Let's call fib6_drop_pcpu_from() before rt6_flush_exceptions(), to set fib6_destroying before rt6_exception_lock, and check f6i->fib6_destroying in rt6_insert_exception(). Note that FIB6_EXCEPTION_BUCKET_FLUSHED logic is dead and we can clean it up in net-next.
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 cc5c073a693fa6ed7a207b0436114f68cce72434 ~ 649ffc76ed5483b2caf35ed90d3787538efc4e53 -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-98598

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III. Intelligence Information for CVE-2026-98598

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Patches & Fixes for CVE-2026-98598 (3)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98568 vxlan: use one headroom snapshot for neighbour replies
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98574 net: bcmgenet: stop Tx NAPI before disabling the queues
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98589 bpf: Reject pkt arguments in mutating subprogs
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98598

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