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CVE-2026-63891— thunderbolt: property: Cap recursion depth in __tb_property_parse_dir()

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存在安全漏洞，该漏洞源于在__tb_property_parse_dir()函数中未对递归深度进行限制，可能导致经过身份验证的攻击者通过特制XDomain对等体触发内核栈耗尽。以下版本受到影响：4.15版本。

AI Predicted 7.5 Difficulty: Easy EPSS 0.26% · P18

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 2b5f47a710172c962ef42d1b732b04d2ad0dce21 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 95839a67ea56ca35732aad7f711404a3127cfe2d affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 0a84ab9271936c11e84e511bb52fc5682f8b6726 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< b4621e5ef63405c317a84b711faf3bd75b3c6a94 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< f31c6d220f455b5af63590302b30e1b932d14599 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 830c8a9b467e7d3a158483d37fa7dc13892b293a affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< ed9455ef4bd9babc90f92e526abe3fb68c1a8709 affected
cdae7c07e3e3509eaabc18c1640a55dc5b99c179< 928abe19fbf0127003abcb1ea69cabc1c897d0ab affected
… +10 more rows
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I. Basic Information for CVE-2026-63891

Vulnerability Information
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Vulnerability Title
thunderbolt: property: Cap recursion depth in __tb_property_parse_dir()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Cap recursion depth in __tb_property_parse_dir() A DIRECTORY entry's value field is used as the dir_offset for a recursive call into __tb_property_parse_dir() with no depth counter. A crafted peer that chains DIRECTORY entries into a back-reference loop drives the parser until the kernel stack is exhausted and the guard page fires. Any untrusted XDomain peer (cable, dock, in-line inspector, adjacent host) that reaches the PROPERTIES_REQUEST control-plane exchange can trigger this without authentication. Thread a depth counter through tb_property_parse() and __tb_property_parse_dir(), and reject blocks that exceed TB_PROPERTY_MAX_DEPTH = 8. That is comfortably larger than any observed legitimate XDomain layout. Operators who do not need XDomain host-to-host discovery can disable the path entirely with thunderbolt.xdomain=0 on the kernel command line.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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存在安全漏洞，该漏洞源于在__tb_property_parse_dir()函数中未对递归深度进行限制，可能导致经过身份验证的攻击者通过特制XDomain对等体触发内核栈耗尽。以下版本受到影响：4.15版本。
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 ~ 2b5f47a710172c962ef42d1b732b04d2ad0dce21 -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-63891

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III. Intelligence Information for CVE-2026-63891

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Patches & Fixes for CVE-2026-63891 (8)

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-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
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-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63891

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