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Intel® Slim Bootloader Advisory
| Intel ID: | INTEL-SA-01526 |
|---|---|
| Advisory Category: | Firmware |
| Impact of vulnerability: | Escalation of Privilege, Denial of Service |
| Severity rating: | HIGH |
| Original release: | 11/10/2026 |
| Last revised: | 11/10/2026 |
Summary:
Potential security vulnerabilities in the Intel® Slim Bootloader may allow denial of service or escalation of privilege. Intel is releasing firmware updates to mitigate these potential vulnerabilities.
Vulnerability Details:
CVEID: CVE-2026-50175
Description: Untrusted pointer dereference in the FirmwareWakingVector for the Intel® Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
CVSS Base Score 4.0: 8.4 High
CVSS Vector 4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVEID: CVE-2026-35500
Description: Stack-based buffer overflow in the UEFI firmware for the Intel® Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of privilege. Startup code and smm adversary with an unauthenticated user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via physical access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.
CVSS Base Score 4.0: 8.6 High
CVSS Vector 4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVEID: CVE-2026-41221
Description: Integer overflow in the UEFI firmware for the Intel® Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of privilege. Startup code and smm adversary with an unauthenticated user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via physical access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.
CVSS Base Score 4.0: 8.6 High
CVSS Vector 4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVEID: CVE-2026-41224
Description: Out-of-bounds write in the UEFI firmware for the Intel® Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of privilege. Startup code and smm adversary with an unauthenticated user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via physical access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.
CVSS Base Score 4.0: 8.6 High
CVSS Vector 4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVEID: CVE-2026-44624
Description: Incorrect comparison in the Ext2 parser for the Intel® Slim Bootloader within Ring 0: Bare Metal OS may allow a denial of service. System software adversary with a privileged user combined with a low complexity attack may enable data corruption. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
CVSS Base Score 4.0: 5.7 Medium
CVSS Vector 4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVEID: CVE-2026-28746
Description: Out-of-bounds read in the AuthenticateComponent for the Intel® Slim Bootloader within Ring 0: Bare Metal OS may allow a denial of service. System software adversary with a privileged user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (none) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
CVSS Base Score 4.0: 6.7 Medium
CVSS Vector 4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected Products:
Product Collection | Processor/SOC Code Name | Vertical Segment | CPU ID |
12th Generation Intel® Core™ Processor | Alder Lake | Mobile | 906A3 |
Intel® Processor N-series | Twin Lake | Mobile | B06E0 |
Intel® Atom® Processor E3900 Series | Apollo Lake | Mobile | 506CA |
Intel® Core™ Ultra Processors (Series 2) | Arrow Lake | Mobile | B0650 |
13th Generation Intel® Core™ Processor | Bartlett Lake-S | Desktop | 90672 |
Intel® Xeon® Processor E Family | Coffee Lake | Server | 906EA |
10th Generation Intel® Core™ Processor Family | Comet Lake | Desktop | A0653 |
Intel® Atom® Processor X Series | Elkhart Lake | Embedded | 90661 |
Intel® Xeon® Processor D Family | Ice Lake-D | Server | 606C1 |
Intel® Xeon® Processor D Family | Granite Rapids-D | Server | A06E1 |
Intel® Core™ Ultra Processor (Series 1) | Meteor Lake | Mobile | A06A4 |
Intel® Core™ Ultra Processors (Series 3) | Panther Lake | Mobile | C06C2 |
13th Generation Intel® Core™ Processor | Raptor Lake | Mobile | B0671 |
11th Generation Intel® Core™ Processor | Tiger Lake | Mobile | 806C1 |
Recommendation:
Intel recommends updating Intel® Slim Bootloader to hash 9e77d9abb867e7ab4fec8249035cf9ba6550aed7 from July 7th, 2026 or later.
Acknowledgements:
The following issues CVE-2026-41221, CVE-2026-41224 and CVE-2026-35500 were found internally by Intel employees. Intel would like to thank Brent Holtsclaw.
Intel would like to thank 0xraban (CVE-2026-28746) and vic5589 (CVE-2026-50175, CVE-2026-44624) for reporting these issues.
Intel, and nearly the entire technology industry, follows a disclosure practice called Coordinated Disclosure, under which a cybersecurity vulnerability is generally publicly disclosed only after mitigations are available.
Intel researchers conduct offensive security reviews as part of our Secure Development Lifecycle (SDL) framework. This includes using advanced analysis and AI-assisted diagnostic tools to simulate adversary capabilities and proactively address potential vulnerabilities prior to external exposure, limiting attacker advantage.
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