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CVE-2026-97598— ipv4: fib: bound automatic table ID allocation

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： ipv4: fib: 限制自动表 ID 分配 fib_empty_table() 从 1 开始探测每个表 ID，直到找到一个空闲的。IPv4 表存储在一个 256 桶的哈希表中，因此密集的 ID 集合会导致每次探测在持有 RTNL 锁的情况下遍历越来越长的哈希链表。 自动表分配（“ip rule ... table 0”）是仅适用于 IPv4 的遗留路径。将自动分配的 ID 限制为 4096，以保持持有 RTNL 锁的时间可控，同时不影响对显式指定表 ID 的查找。 这改变

AI Predicted 7.8 Difficulty: Trivial EPSS 0.21% · P10

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b801f54917b7c6e8540f877ee562cd0725e62ebd< 999bc00588cb305ab25065e8a8ac31da7465301c affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< f1f2da33eaab54b4d5cdea6d70befb2e2fb49cb6 affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< 125890702ef4417cd0ffac2e448c0cd4fbf0ac45 affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< 3080f9e653d8c057d5652db5ced8137f81b3fcbd affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< bc8d01d856db106f284b19961af6112e10c3e3b4 affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< fe9a906d2bff2d2707bafd6353b5e032a42aeb35 affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< 2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503 affected
b801f54917b7c6e8540f877ee562cd0725e62ebd< efdfb1e27a3328085b79540dfe781d537b576ea1 affected
… +10 more rows
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I. Basic Information for CVE-2026-97598

Vulnerability Information
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Vulnerability Title
ipv4: fib: bound automatic table ID allocation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: fib: bound automatic table ID allocation fib_empty_table() probes every table ID from 1 until it finds a free one. IPv4 tables are stored in a 256-bucket hash table, so a dense set of IDs makes each probe walk a growing hash chain while RTNL is held. Automatic table assignment ("ip rule ... table 0") is an IPv4-only legacy path. Bound the automatically allocated ID to 4096 so the RTNL hold stays bounded, without changing lookups of explicitly specified table IDs. This changes user-visible behavior. A table-0 rule previously received the lowest free ID in 1..RT_TABLE_MAX (0xFFFFFFFF). After this patch the search stops at 4096 and the rule add fails with ENOBUFS if that range is fully occupied. Explicit table IDs above 4096 remain usable. The automatic path is unused in practice: it is IPv4-only, not documented by ip-rule, uncovered by kernel selftests, and both NetworkManager and systemd refuse table 0.
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 b801f54917b7c6e8540f877ee562cd0725e62ebd ~ 999bc00588cb305ab25065e8a8ac31da7465301c -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-97598

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III. Intelligence Information for CVE-2026-97598

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Patches & Fixes for CVE-2026-97598 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97903 7.8 HIGH exit: hold a reference to thread_pid across proc_flush_pid
CVE-2026-97548 7.8 HIGH xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions
CVE-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().
CVE-2026-97602 7.8 HIGH inet: frags: invalidate queues before flushing them
CVE-2026-97577 7.8 HIGH media: verisilicon: rockchip: reject AV1 frames exceeding the tile capacity

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-97598

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