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CVE-2026-98567— net: xps: reject an out of range traffic class

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，以下漏洞已被修复： 网络子系统：XPS（Transmit Packet Steering）拒绝超出范围的流量类别 在 数组中，仅索引小于 的条目是有效的；同时， 也只能引用小于该数值的流量类别。然而， 函数在降低 时，并未同步更新上述两个数组。 函数会遍历所有 个槽位，而 则直接返回当前条目。这导致残留的条目可能被当作大于或等于 的流量类别返回。当从 获取此类类别后， 仅会拒绝负值，随后便使用一个按 个类别大小分配的 XPS 映射表进行索引： 包含 个条目，其中 遍历掩码中指定的 ID。若某

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 184c449f91fef521042970cca46bd5cdfc0e3a37< 967e10f40a0c6732db299cbe001df0e859196055 affected
184c449f91fef521042970cca46bd5cdfc0e3a37< 1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81 affected
184c449f91fef521042970cca46bd5cdfc0e3a37< 6ea8f643053f33622f9116e4e1db58306ece45e3 affected
184c449f91fef521042970cca46bd5cdfc0e3a37< 9e841723ba482d41ecbf90241c756a16cdfea949 affected
184c449f91fef521042970cca46bd5cdfc0e3a37< eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f affected
184c449f91fef521042970cca46bd5cdfc0e3a37< 2cc1c3977acbffc417fb5b57699d1df3dcffb5fd affected
184c449f91fef521042970cca46bd5cdfc0e3a37< 930318290d8509e864c015fe6c9239470b3c579c affected
184c449f91fef521042970cca46bd5cdfc0e3a37< 4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910 affected
… +10 more rows
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I. Basic Information for CVE-2026-98567

Vulnerability Information
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Vulnerability Title
net: xps: reject an out of range traffic class
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: xps: reject an out of range traffic class Only the entries below dev->num_tc are valid in dev->tc_to_txq[], and dev->prio_tc_map[] may only name classes below it. netdev_set_num_tc() lowers dev->num_tc without touching either array. netdev_txq_to_tc() walks all TC_MAX_QUEUE slots and netdev_get_prio_tc_map() returns the entry as it stands, so a leftover entry is handed out as a traffic class >= dev->num_tc. Taking that class from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a negative one and indexes an XPS map sized for dev->num_tc classes: tci = j * num_tc + tc; RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); attr_map[] holds nr_ids * num_tc entries and j runs over the ids named in the mask, so a class that is not below num_tc pushes tci past the end of the map for the last ids and the store overruns it. Any caller that lowers num_tc leaves such entries behind, and mqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than netdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7] still describe txq 1..7. The splat is from an XPS write to txq 2 on a veth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and j == 6 stores one past the end of the 88-byte map: BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954) Write of size 8 at addr ffff88813016bc58 by task xps_oob/634 __netif_set_xps_queue (net/core/dev.c:2954) xps_rxqs_store (net/core/net-sysfs.c:1880) netdev_queue_attr_store (net/core/net-sysfs.c:1390) Allocated by task 634: __kmalloc_noprof (mm/slub.c:5439) __netif_set_xps_queue (net/core/dev.c:2937) The buggy address is located 0 bytes to the right of allocated 88-byte region [ffff88813016bc00, ffff88813016bc58) Reject a class the map has no room for.
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 184c449f91fef521042970cca46bd5cdfc0e3a37 ~ 967e10f40a0c6732db299cbe001df0e859196055 -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-98567

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III. Intelligence Information for CVE-2026-98567

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Patches & Fixes for CVE-2026-98567 (8)

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

CVE-2026-98583 nfc: nfcmrvl: validate helper command length before pull
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-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98595 udp: remove a disconnected socket from the 4-tuple hash table

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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