CVE-2026-93134

Summary

In the Linux kernel, the following vulnerability has been resolved:

printk: Fix possible console use-after-free

When emitting a record via legacy printing, it is possible that a handover to another legacy printing context occurs. When a context has performed a handover, the console SRCU read lock is released and the pointer to the console struct might now be invalid. Therefore, after calling nbcon_legacy_emit_next_record() or console_emit_next_record(), it is necessary to check if a handover occurred before further @con usage.

Sashiko pointed out that console_flush_one_record() was not doing this.

In console_flush_one_record(), after emitting a record, move the further usage of @con after the handover check.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc158834b223fbfab3a14855ac203b8d9cddbbefd < f0104a7b730de32eefb3d4a27279592b5504ad59affected
LinuxLinuxc158834b223fbfab3a14855ac203b8d9cddbbefd < fbf9bb81b21537ede387a31cc586f1d2ce66a74eaffected
LinuxLinuxc158834b223fbfab3a14855ac203b8d9cddbbefd < 8f194dee0c0d1223255bae1429e1939882f540fcaffected
LinuxLinuxc158834b223fbfab3a14855ac203b8d9cddbbefd < 36630cafbeede0b64c370edb2f7b4094327ee1e0affected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References