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CVE-2026-63893— thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()

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基金会开源的一款操作系统内核。 Linux kernel 4.15版本存在安全漏洞，该漏洞源于整数溢出问题，可能导致恶意XDomain对等体读取分配之外的内存。

CVSS 8.1 · High EPSS 0.39% · P31

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 6a63623621639acbb39bc2d9fb09559681716695 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 9fee50c4e1e42f6d3cbe30df584f9f648f626071 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 8d4a758b407ab3de3be86d1ceadfa35d717d30c7 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 5c06a3043ad944f087bb2ae0aae28d820bb9f460 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 31b98e503ecca8077e5247253dd5425ab84bc96d affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< a47784aee77f33f786dc5d7375db821bdae68792 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 01deda0152066c6c955f0619114ea6afa070aaec affected
… +10 more rows
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I. Basic Information for CVE-2026-63893

Vulnerability Information
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Vulnerability Title
thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Reject u32 wrap in tb_property_entry_valid() entry->value is u32 and entry->length is u16; the sum is performed in u32 and wraps. A malicious XDomain peer can pick value = 0xffffff00, length = 0x100 so the sum 0x100000000 wraps to 0 and passes the > block_len check. tb_property_parse() then passes entry->value to parse_dwdata() as a dword offset into the property block, reading attacker-directed memory far past the allocation. For TEXT-typed entries with the "deviceid" or "vendorid" keys this lands in xd->device_name / xd->vendor_name and is readable back via the per-XDomain device_name / vendor_name sysfs attributes; the leak is NUL-bounded (kstrdup() stops at the first zero byte) and untargeted (the attacker picks a delta, not an absolute address). DATA-typed entries are parsed into property->value.data but not generically surfaced to userspace. Use check_add_overflow() so a wrapped sum is rejected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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基金会开源的一款操作系统内核。 Linux kernel 4.15版本存在安全漏洞，该漏洞源于整数溢出问题，可能导致恶意XDomain对等体读取分配之外的内存。
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 cdae7c07e3e3509eaabc18c1640a55dc5b99c179 ~ 6a63623621639acbb39bc2d9fb09559681716695 -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-63893

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III. Intelligence Information for CVE-2026-63893

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Patches & Fixes for CVE-2026-63893 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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