SB2026092594 - Use-after-free in Linux kernel staging octeon driver
Published: September 25, 2026
Security Bulletin ID
SB2026092594
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-93279)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a use-after-free condition.
The vulnerability exists due to a use-after-free in the Octeon staging Ethernet driver cleanup tasklet, cvm_oct_tx_do_cleanup, when device teardown occurs while the cleanup tasklet remains pending. A local user can trigger device teardown while the cleanup tasklet is pending to cause a use-after-free condition.
The watchdog IRQ handler can schedule the cleanup tasklet.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/03d12490afd1198310ad0aba42462329832eb739
- https://git.kernel.org/stable/c/2c0c9956596e48654bb4855e2a0742748a0826a7
- https://git.kernel.org/stable/c/32efcb6d5f4e3f030e7b0a3ba5c6c0684dd07486
- https://git.kernel.org/stable/c/41a79bd9e5a74f8f483b3b206d10567912874fb4
- https://git.kernel.org/stable/c/a77efd85e0d48c877f66d2bc3ab89cc1b8dacd19
- https://git.kernel.org/stable/c/b6365e4186322858a82c8713b1d0bd209c8e765a
- https://git.kernel.org/stable/c/b9af44b0d20b2247c4eb0ea5cfca907d643eea50
- https://git.kernel.org/stable/c/d15226338dfaa84ffff142d32723cdf74d0c47c4