CVE-2026-63964
Vulnerability Scoring
Analysis In Progress
CVE-2026-63964 Vulnerability Analysis & Exploit Details
CVE-2026-63964
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-63964 Details
Status: Received on 19 Jul 2026, 16:17 UTC
Last updated: 🕖 20 Jul 2026, 07:16 UTC
Originally published on: 🕓 19 Jul 2026, 16:17 UTC
CVSS Release:
CVE-2026-63964 Vulnerability Summary
CVE-2026-63964: In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: reject firmware images without a ':' record header do_flash() locates the first .cyacd record with p = strnchr(fw->data, fw->size, ':'); while (p < eof) { s = strnchr(p + 1, eof - p - 1, ':'); ... } If the firmware image contains no ':' byte, strnchr() returns NULL. NULL compares less than the valid kernel pointer eof, so the loop body runs and strnchr() is called with p + 1 == (void *)1 and a length of roughly (unsigned long)eof, causing a wonderful crash. The not_signed_fw fallthrough earlier in do_flash() and the chip-state branches in ccg_fw_update_needed() allow an unsigned blob to reach this loop, so a root user who can place a crafted file under /lib/firmware and write the do_flash sysfs attribute can trigger the oops. Bail out with -EINVAL when the initial strnchr() returns NULL.
Assessing the Risk of CVE-2026-63964
Access Complexity Graph
The exploitability of CVE-2026-63964 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-63964
No exploitability data is available for CVE-2026-63964.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-63964, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-63964, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-63964 does not compromise confidentiality.
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Integrity:
None
CVE-2026-63964 does not impact data integrity.
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Availability:
None
CVE-2026-63964 does not affect system availability.
CVE-2026-63964 References
External References
- https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213
- https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b
- https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e
- https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa
- https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3
- https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb
- https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450
- https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273
CWE Common Weakness Enumeration
Unknown
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