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CVE-2026-98241— ipv6: xfrm: use full sockets in local error paths

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： ipv6: xfrm: 在本地错误处理路径中使用完整套接字 和 函数假设 始终指向一个完整的 IPv6 套接字，并据此对其进行解引用操作。 然而，这一假设并不总是成立。TCP SYN-ACK 数据包可能由 状态下的 拥有，而实际的输出路径则由完整的监听套接字驱动。如果重路由操作选择了一个具有较小 MTU 的 IPv6 XFRM 隧道路由，则本地 PMTU/错误处理路径可能会在这些回调函数中遇到仍附加在数据包上的迷你套接字（request_sock）。 随后，这些回调函数会将

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux dd767856a36e00b631d65ebc4bb81b19915532d6< b1a88633c36d2cbc3831382f3846754d344276fd affected
dd767856a36e00b631d65ebc4bb81b19915532d6< 904a0e827d0d7189271a3a2eb648293809f25efc affected
dd767856a36e00b631d65ebc4bb81b19915532d6< 675919e08ce266b8cac11fd9af29170e762a480f affected
dd767856a36e00b631d65ebc4bb81b19915532d6< 60459c670329d586a58db5d8f811fa5accfe4862 affected
dd767856a36e00b631d65ebc4bb81b19915532d6< ca3d68c3213475b53db6647e159dc73bd1af5ab1 affected
dd767856a36e00b631d65ebc4bb81b19915532d6< 4c030a0400ebfd2318361c923a88103b2c67c49f affected
dd767856a36e00b631d65ebc4bb81b19915532d6< c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8 affected
dd767856a36e00b631d65ebc4bb81b19915532d6< 6973a21ee73c5567f883813c8ef414774b45892f affected
… +10 more rows
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I. Basic Information for CVE-2026-98241

Vulnerability Information
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Vulnerability Title
ipv6: xfrm: use full sockets in local error paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: xfrm: use full sockets in local error paths xfrm6_local_rxpmtu() and xfrm6_local_error() dereference skb->sk as if it always pointed at a full IPv6 socket. That is not guaranteed. TCP SYN-ACK skbs can be owned by a TCP_NEW_SYN_RECV request_sock while the output path itself is driven by the full listener. If rerouting selects an IPv6 XFRM tunnel route with a lower MTU, the local PMTU/error handling path can reach these callbacks with that mini-socket still attached to the skb. The callbacks then miscast the request socket as a full inet/IPv6 socket and can read beyond the request_sock allocation when they access inet_sock or ipv6_pinfo state. Resolve the owner with skb_to_full_sk() in both callbacks and bail out when no full socket is attached. This matches the surrounding XFRM IPv6 PMTU/error logic, which already reasons about full sockets with skb_to_full_sk().
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 dd767856a36e00b631d65ebc4bb81b19915532d6 ~ b1a88633c36d2cbc3831382f3846754d344276fd -
Linux Linux 3.2 -

II. Public POCs for CVE-2026-98241

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III. Intelligence Information for CVE-2026-98241

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Patches & Fixes for CVE-2026-98241 (8)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98241

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