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CVE-2026-46273— ibmveth: Disable GSO for packets with small MSS

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ibmveth驱动未禁用MSS小于224字节的数据包的GSO，可能导致适配器冻结。

CVSS 8.6 · High EPSS 0.72% · P53

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8641dd85799f85bef5f0d1f87356aaa12cb2195e< 86fc64584811d43c9ccd74447de58620189d8b77 affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 9a5e984d7af910e46dcbed3ce77873e000a4f77d affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 82bc89fbb82d9396fb4eaee8720ea85e2e787957 affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< db8012c631cb845e9ae2b4b531e17d86c9519755 affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< c1f261863e65b508f37416dfbc5c5d911c9b9233 affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 3af24f0c4c31f18a4a2d927990759194832bb6e9 affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 affected
… +10 more rows
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I. Basic Information for CVE-2026-46273

Vulnerability Information
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Vulnerability Title
ibmveth: Disable GSO for packets with small MSS
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapters on Power systems do not support segmentation offload when the MSS is less than 224 bytes. Attempting to send such packets causes the adapter to freeze, stopping all traffic until manually reset. Implement ndo_features_check to disable GSO for packets with small MSS values. The network stack will perform software segmentation instead. The 224-byte minimum matches ibmvnic commit <f10b09ef687f> ("ibmvnic: Enforce stronger sanity checks on GSO packets") which uses the same physical adapters in SEA configurations. The issue occurs specifically when the hardware attempts to perform segmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets (gso_segs == 1) do not trigger the problematic LSO code path and are transmitted normally without segmentation. Add an ndo_features_check callback to disable GSO when MSS < 224 bytes. Also call vlan_features_check() to ensure proper handling of VLAN packets, particularly QinQ (802.1ad) configurations where the hardware parser may not support certain offload features. Validated using iptables to force small MSS values. Without the fix, the adapter freezes. With the fix, packets are segmented in software and transmission succeeds. Comprehensive regression testing completedd (MSS tests, performance, stability).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ibmveth驱动未禁用MSS小于224字节的数据包的GSO，可能导致适配器冻结。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8641dd85799f85bef5f0d1f87356aaa12cb2195e ~ 86fc64584811d43c9ccd74447de58620189d8b77 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-46273

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III. Intelligence Information for CVE-2026-46273

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Patches & Fixes for CVE-2026-46273 (8)

Same Patch Batch · Linux · 2026-06-03 · 32 CVEs total

CVE-2026-46244 9.1 CRITICAL netfilter: nft_inner: Fix IPv6 inner_thoff desync
CVE-2026-46266 9.1 CRITICAL inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
CVE-2026-46264 8.8 HIGH drm/xe/pf: Fix sysfs initialization
CVE-2026-46270 8.4 HIGH power: supply: rt9455: Fix use-after-free in power_supply_changed()
CVE-2026-46251 8.4 HIGH btrfs: fix block_group_tree dirty_list corruption
CVE-2026-46271 7.8 HIGH wifi: ath12k: do WoW offloads only on primary link
CVE-2026-46253 7.8 HIGH pstore/ram: fix buffer overflow in persistent_ram_save_old()
CVE-2026-46259 7.8 HIGH procfs: fix missing RCU protection when reading real_parent in do_task_stat()
CVE-2026-46260 7.8 HIGH ipv6: Fix out-of-bound access in fib6_add_rt2node().
CVE-2026-46263 7.8 HIGH drm/amd/display: Fix out-of-bounds stream encoder index v3
CVE-2026-46265 7.5 HIGH RDMA/hns: Fix WQ_MEM_RECLAIM warning
CVE-2026-46250 7.3 HIGH MIPS: Work around LLVM bug when gp is used as global register variable
CVE-2026-46252 regulator: core: fix locking in regulator_resolve_supply() error path
CVE-2026-46272 coresight: tmc-etr: Fix race condition between sysfs and perf mode
CVE-2025-71313 PCI: endpoint: Add missing NULL check for alloc_workqueue()
CVE-2025-71314 drm/panthor: Recover from panthor_gpu_flush_caches() failures
CVE-2026-46245 drm/amd/display: Fix dc_link NULL handling in HPD init
CVE-2026-46246 power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler
CVE-2026-46247 clk: qcom: gfx3d: add parent to parent request map
CVE-2026-46248 wifi: ath12k: clear stale link mapping of ahvif->links_map

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46273

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