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

CVSS 8.1 · High EPSS 0.36% · P29

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxcdae7c07e3e3509eaabc18c1640a55dc5b99c179< 6a63623621639acbb39bc2d9fb09559681716695affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 9fee50c4e1e42f6d3cbe30df584f9f648f626071affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 8d4a758b407ab3de3be86d1ceadfa35d717d30c7affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 5c06a3043ad944f087bb2ae0aae28d820bb9f460affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 31b98e503ecca8077e5247253dd5425ab84bc96daffected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< a47784aee77f33f786dc5d7375db821bdae68792affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 01deda0152066c6c955f0619114ea6afa070aaecaffected
… +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

VendorProductAffected VersionsCPESubscribe
LinuxLinux cdae7c07e3e3509eaabc18c1640a55dc5b99c179 ~ 6a63623621639acbb39bc2d9fb09559681716695 -
LinuxLinux 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 · 431 CVEs total

CVE-2026-6379510.0 CRITICAL9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-639229.8 CRITICALipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-641369.8 CRITICALsmb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-641509.8 CRITICALnetfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-639249.8 CRITICALipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-640009.8 CRITICALnet: hsr: fix potential OOB access in supervision frame handling
CVE-2026-640469.8 CRITICALnet: tls: prevent chain-after-chain in plain text SG
CVE-2026-640479.8 CRITICALnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
CVE-2026-639949.8 CRITICALtunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVE-2026-641429.8 CRITICALksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-639939.8 CRITICALvxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-533989.8 CRITICALNFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-641329.8 CRITICALipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-533999.8 CRITICALnfsd: release layout stid on setlease failure
CVE-2026-640559.8 CRITICALnet: ethernet: cortina: Carry over frag counter
CVE-2026-641259.8 CRITICALnet: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-641229.8 CRITICALnet/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-638579.8 CRITICALnet: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-639799.8 CRITICALnet/handshake: hand off the pinned file reference to accept_doit
CVE-2026-639789.8 CRITICALnet/handshake: Drain pending requests at net namespace exit

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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