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CVE-2026-98532— ipv6: do not let ipv6_find_hdr() return an offset past the packet end

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 ipv6_find_hdr() 返回超出数据包末尾的偏移量 ipv6_find_hdr() 会遍历扩展头链，并根据每个头自身声明的长度跳过该头。ipv6_optlen() 最多可返回 2048，而跳过长度从未与 skb->len（数据包总长度）进行校验，因此存储在 *offset 中的偏移量可能指向数据包末尾之外。 Open vSwitch 将该偏移量设置为传输层头部，随后 update_ipv6_checksum() 越界读取和写入传输层校验和字段，从

CVSS 8.1 · High EPSS 0.61% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f8f626754ebeca613cf1af2e6f890cfde0e74d5b< ca96b38730e31357ef4a9d76af1336958ac670d7 affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< 531255de8971c06d5d5986f85fdc2525d707ba71 affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< 543354c6efb27eae3372a3a9674aeaa2a86e2b2c affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< dc92cb972e86790b8078337ec41015b748b8f8e5 affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< 1c70275ca87e769e1a52abc644d61372d8c016cb affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< 1d42828565889632068fbc2983c34d57c66af4e0 affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< 4254d5878c320c19961dd0b8e1d0aca4800d8b7d affected
f8f626754ebeca613cf1af2e6f890cfde0e74d5b< ee319bd3a0e976af5087cbe59ebc50a66f31d202 affected
… +10 more rows
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I. Basic Information for CVE-2026-98532

Vulnerability Information
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Vulnerability Title
ipv6: do not let ipv6_find_hdr() return an offset past the packet end
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: do not let ipv6_find_hdr() return an offset past the packet end ipv6_find_hdr() walks the extension header chain, skipping each header by the length that header itself declares. ipv6_optlen() returns up to 2048, and the skip is never checked against skb->len, so the offset stored in *offset can point past the end of the packet. openvswitch installs that offset as the transport header, and update_ipv6_checksum() then reads and writes the transport checksum field out of bounds: BUG: KASAN: slab-use-after-free in inet_proto_csum_replace16+0x445/0x470 Read of size 2 at addr ffff88810b754b06 by task ovs_ipv6_oob/629 CPU: 4 UID: 1000 PID: 629 Comm: ovs_ipv6_oob Tainted: G N 7.3.0-rc3+ #348 Call Trace: inet_proto_csum_replace16+0x445/0x470 set_ipv6_addr+0x3dd/0x460 do_execute_actions+0x6a3d/0x7c40 ovs_execute_actions+0xfd/0x480 ovs_packet_cmd_execute+0xc38/0xf20 genl_rcv_msg+0x59e/0x870 netlink_rcv_skb+0x18b/0x450 genl_rcv+0x2d/0x40 netlink_unicast+0x6bc/0xa20 The buggy address belongs to the object at ffff88810b754980 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 390 bytes inside of freed 704-byte region [ffff88810b754980, ffff88810b754c40) Other callers use that offset too, so bound it here rather than in one caller. Reject a header whose declared length does not fit in the packet. ipv6_find_hdr() already fails with -EBADMSG on a malformed chain, so this adds no new failure mode.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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 f8f626754ebeca613cf1af2e6f890cfde0e74d5b ~ ca96b38730e31357ef4a9d76af1336958ac670d7 -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-98532

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III. Intelligence Information for CVE-2026-98532

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Patches & Fixes for CVE-2026-98532 (8)

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-2026-98499 8.1 HIGH HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
CVE-2026-98454 8.1 HIGH smb: client: fix create context out-of-bounds reads
CVE-2026-98517 7.8 HIGH drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM
CVE-2026-98510 7.8 HIGH drm/xe/vm: nuke PTs only after unlinking contested VMAs
CVE-2026-98520 7.8 HIGH drm/amdkfd: fix use-after-free and multi-container gap in kfd_dev_mapping
CVE-2026-98436 7.8 HIGH accel/amdxdna: Disable device buffer exporting
CVE-2026-98524 7.8 HIGH rds: ib: Clear the sg list when mapping an MR fails
CVE-2026-98507 7.8 HIGH mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish
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-2026-98441 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
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