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CVE-2026-98687

UnknownEPSS 0.17%

Last modified

CVE-2026-98687 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords. Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length. Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block.

Metrics

EPSS Probability
0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= d1ff70241a275133e1a0258b7c23588b122276c8, < 9fba032802b5858bc6186b34f8e966429ff155ab; >= d1ff70241a275133e1a0258b7c23588b122276c8, < 7c028d2ae85eca86b82cab1163a9ac1187a2e666; >= d1ff70241a275133e1a0258b7c23588b122276c8, < 37ea4304bd9f57ebe719409f010915495467f05c; >= d1ff70241a275133e1a0258b7c23588b122276c8, < b270c1074860de74da0d6b5250fb06b359b9d509; >= d1ff70241a275133e1a0258b7c23588b122276c8, < a766a86ff48acee76aeb8e2575771040749e509d; >= d1ff70241a275133e1a0258b7c23588b122276c8, < 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa; >= d1ff70241a275133e1a0258b7c23588b122276c8, < 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a; >= d1ff70241a275133e1a0258b7c23588b122276c8, < 80756e263846ab694984e749e8c626897331438f
LinuxLinux4.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98687?
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords. Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length. Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block.
How severe is CVE-2026-98687?
Severity scoring for CVE-2026-98687 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98687?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST