CVE-2026-90257

Bluetooth: virtio_bt: avoid OOB read of build info string

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	afd2daa26c7abd734d78bd274fc6c59a15e61063 to before fb445b3466a8d1c7a0b0d0676fb475e3ce22d94eAffected afd2daa26c7abd734d78bd274fc6c59a15e61063 to before d08c99abf06133a7829d46627e77e3315ca974d2Affected afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 0e388d805233a883a31271676eae6031dfc9e898Affected afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 54e9387eb7546eaa6f600220599d55740956ffc3Affected afd2daa26c7abd734d78bd274fc6c59a15e61063 to before be1e3df2c49c91b0a052c6563884e8d39bd768b2Affected afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 84ea9c99874804f5ca13f35bbc186ba93902f30fAffected afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 502adc06ba76dee19c292ae4a07d74d202fe734dAffected
LinuxLinux	5.13Affected before 5.13Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

afd2daa26c7abd734d78bd274fc6c59a15e61063 to before fb445b3466a8d1c7a0b0d0676fb475e3ce22d94eAffected
afd2daa26c7abd734d78bd274fc6c59a15e61063 to before d08c99abf06133a7829d46627e77e3315ca974d2Affected
afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 0e388d805233a883a31271676eae6031dfc9e898Affected
afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 54e9387eb7546eaa6f600220599d55740956ffc3Affected
afd2daa26c7abd734d78bd274fc6c59a15e61063 to before be1e3df2c49c91b0a052c6563884e8d39bd768b2Affected
afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 84ea9c99874804f5ca13f35bbc186ba93902f30fAffected
afd2daa26c7abd734d78bd274fc6c59a15e61063 to before 502adc06ba76dee19c292ae4a07d74d202fe734dAffected

LinuxLinux

5.13Affected
before 5.13Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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