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

CVSS 8.6 · High EPSS 0.39% · P31

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux8641dd85799f85bef5f0d1f87356aaa12cb2195e< 86fc64584811d43c9ccd74447de58620189d8b77affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 9a5e984d7af910e46dcbed3ce77873e000a4f77daffected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 1cdf5dbcec988d06f5f720bdf89e91073f77fa10affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 82bc89fbb82d9396fb4eaee8720ea85e2e787957affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< db8012c631cb845e9ae2b4b531e17d86c9519755affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< c1f261863e65b508f37416dfbc5c5d911c9b9233affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< 3af24f0c4c31f18a4a2d927990759194832bb6e9affected
8641dd85799f85bef5f0d1f87356aaa12cb2195e< cc427d24ac6442ffdeafd157a63c7c5b73ed4de4affected
… +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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 8641dd85799f85bef5f0d1f87356aaa12cb2195e ~ 86fc64584811d43c9ccd74447de58620189d8b77 -
LinuxLinux 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-2026-462449.1 CRITICALnetfilter: nft_inner: Fix IPv6 inner_thoff desync
CVE-2026-462669.1 CRITICALinet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
CVE-2026-462648.8 HIGHdrm/xe/pf: Fix sysfs initialization
CVE-2026-462708.4 HIGHpower: supply: rt9455: Fix use-after-free in power_supply_changed()
CVE-2026-462518.4 HIGHbtrfs: fix block_group_tree dirty_list corruption
CVE-2026-462717.8 HIGHwifi: ath12k: do WoW offloads only on primary link
CVE-2026-462537.8 HIGHpstore/ram: fix buffer overflow in persistent_ram_save_old()
CVE-2026-462597.8 HIGHprocfs: fix missing RCU protection when reading real_parent in do_task_stat()
CVE-2026-462607.8 HIGHipv6: Fix out-of-bound access in fib6_add_rt2node().
CVE-2026-462637.8 HIGHdrm/amd/display: Fix out-of-bounds stream encoder index v3
CVE-2026-462657.5 HIGHRDMA/hns: Fix WQ_MEM_RECLAIM warning
CVE-2026-462507.3 HIGHMIPS: Work around LLVM bug when gp is used as global register variable
CVE-2026-46252regulator: core: fix locking in regulator_resolve_supply() error path
CVE-2026-46272coresight: tmc-etr: Fix race condition between sysfs and perf mode
CVE-2025-71313PCI: endpoint: Add missing NULL check for alloc_workqueue()
CVE-2025-71314drm/panthor: Recover from panthor_gpu_flush_caches() failures
CVE-2026-46245drm/amd/display: Fix dc_link NULL handling in HPD init
CVE-2026-46246power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler
CVE-2026-46247clk: qcom: gfx3d: add parent to parent request map
CVE-2026-46248wifi: 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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