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CVE-2026-90257

Unknown

Last modified

CVE-2026-90257 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: avoid OOB read of build info string The virtbt_setup_zephyr() sends the Zephyr vendor command 0xfc08 (Read Build Information) and hands the response to bt_dev_info() and hci_set_fw_info() as a "%s" string starting at skb->data + 1, without checking the length. A backend that answers with status only leaves that pointer past the end of the received data, so the walk reads adjacent slab memory until it meets a NUL.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: avoid OOB read of build info string The virtbt_setup_zephyr() sends the Zephyr vendor command 0xfc08 (Read Build Information) and hands the response to bt_dev_info() and hci_set_fw_info() as a "%s" string starting at skb->data + 1, without checking the length. A backend that answers with status only leaves that pointer past the end of the received data, so the walk reads adjacent slab memory until it meets a NUL. Those bytes reach the kernel log and the firmware-info debugfs file. To fix this, print the string with a bounded "%.*s" limited to skb->len - 1. A short or unterminated response then prints as much as arrived instead of failing setup. This mirrors commit dd068ef04412 ("Bluetooth: bpa10x: avoid OOB read of revision string in bpa10x_setup()"), which fixed the identical pattern.

Affected Software

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

VendorProductVersions
LinuxLinux>= afd2daa26c7abd734d78bd274fc6c59a15e61063, < fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e; >= afd2daa26c7abd734d78bd274fc6c59a15e61063, < d08c99abf06133a7829d46627e77e3315ca974d2; >= afd2daa26c7abd734d78bd274fc6c59a15e61063, < 0e388d805233a883a31271676eae6031dfc9e898; >= afd2daa26c7abd734d78bd274fc6c59a15e61063, < 54e9387eb7546eaa6f600220599d55740956ffc3; >= afd2daa26c7abd734d78bd274fc6c59a15e61063, < be1e3df2c49c91b0a052c6563884e8d39bd768b2; >= afd2daa26c7abd734d78bd274fc6c59a15e61063, < 84ea9c99874804f5ca13f35bbc186ba93902f30f; >= afd2daa26c7abd734d78bd274fc6c59a15e61063, < 502adc06ba76dee19c292ae4a07d74d202fe734d
LinuxLinux5.13

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90257?
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: avoid OOB read of build info string The virtbt_setup_zephyr() sends the Zephyr vendor command 0xfc08 (Read Build Information) and hands the response to bt_dev_info() and hci_set_fw_info() as a "%s" string starting at skb->data + 1, without checking the length. A backend that answers with status only leaves that pointer past the end of the received data, so the walk reads adjacent slab memory until it meets a NUL. Those bytes reach the kernel log and the firmware-info debugfs file. To fix this, print the string with a bounded "%.*s" limited to skb->len - 1. A short or unterminated response then prints as much as arrived instead of failing setup. This mirrors commit dd068ef04412 ("Bluetooth: bpa10x: avoid OOB read of revision string in bpa10x_setup()"), which fixed the identical pattern.
How severe is CVE-2026-90257?
Severity scoring for CVE-2026-90257 is pending analysis.
How do I fix CVE-2026-90257?
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