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CVE-2026-43093— xsk: tighten UMEM headroom validation to account for tailroom and min frame

CVSS 7.8 · High EPSS 0.01% · P2

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux99e3a236dd43d06c65af0a2ef9cb44306aef6e02< a03975beb9f6af0d8ac051e30b2abeabe618414faffected
99e3a236dd43d06c65af0a2ef9cb44306aef6e02< 0ec4d3f6e6934deb843b561ae048cd17218e5ad1affected
99e3a236dd43d06c65af0a2ef9cb44306aef6e02< 9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12affected
99e3a236dd43d06c65af0a2ef9cb44306aef6e02< 6523bc1b40e69301f24c14338b762af4739d6d39affected
99e3a236dd43d06c65af0a2ef9cb44306aef6e02< a315e022a72d95ef5f1d4e58e903cb492b0ad931affected
ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6eeaffected
25c9cdef57488578da21d99eb614b97ffcf6e59faffected
98d3c852e63b49129515dd18c875999efaf8530aaffected
… +10 more rows
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I. Basic Information for CVE-2026-43093

Vulnerability Information
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Vulnerability Title
xsk: tighten UMEM headroom validation to account for tailroom and min frame
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb_shared_info stored at the end of XSK frame would be corrupted. HW typically works with 128-aligned sizes so let us provide this value as bare minimum. Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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xdp_umem_reg中头部空间验证不足，可能导致最小以太网帧接收空间不足或skb_shared_info损坏。
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 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 ~ a03975beb9f6af0d8ac051e30b2abeabe618414f -
LinuxLinux 5.7 -

II. Public POCs for CVE-2026-43093

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III. Intelligence Information for CVE-2026-43093

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Patches & Fixes for CVE-2026-43093 (5)

Same Patch Batch · Linux · 2026-05-06 · 225 CVEs total

CVE-2026-431869.8 CRITICALipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-431859.8 CRITICALksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-431259.8 CRITICALdlm: validate length in dlm_search_rsb_tree
CVE-2026-432089.8 CRITICALnet: do not pass flow_id to set_rps_cpu()
CVE-2026-431989.8 CRITICALtcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-431149.4 CRITICALnetfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-431979.1 CRITICALnetconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-430839.1 CRITICALnet: ioam6: fix OOB and missing lock
CVE-2026-431179.1 CRITICALbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-431108.8 HIGHwifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-431878.8 HIGHxfs: delete attr leaf freemap entries when empty
CVE-2026-431128.8 HIGHfs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-431138.8 HIGHwifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-432838.8 HIGHnet: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-432158.8 HIGHcifs: Fix locking usage for tcon fields
CVE-2026-431588.8 HIGHxfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-431768.8 HIGHwifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-432498.8 HIGH9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-431728.8 HIGHwifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-432398.8 HIGHsmb: client: prevent races in ->query_interfaces()

Showing top 20 of 225 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43093

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