Vulnerability Database

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CVE-2026-100076 — linux / linux_kernel

Missing Release of Memory after Effective Lifetime

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

staging: rtl8723bs: fix xmit_frame/xmit_buf leaks on mgnt-frame error paths

issue_beacon(), issue_probersp() and issue_asocrsp() obtain a management xmit_frame together with its xmit_buf from the driver's fixed-size management-TX pools via alloc_mgtxmitframe(). On the normal path the frame is handed to dump_mgntframe(), which transfers ownership and eventually returns both objects to their pools (the frame and, for beacons, the buf in rtl8723bs_mgnt_xmit(); other bufs via the pending-xmitbuf/TX-completion path).

Several error/edge paths return early after a successful alloc_mgtxmitframe() but before dump_mgntframe(), so ownership is never transferred and neither object is freed:

  • issue_beacon(): beacon larger than 512 bytes
  • issue_probersp(): cur_network->ie_length > MAX_IE_SZ
  • issue_probersp(): kzalloc() of the SSID scratch buffer fails
  • issue_asocrsp(): pkt_type is neither ASSOCRSP nor REASSOCRSP

Because alloc_mgtxmitframe() removes the frame and buf from their free lists (list_del_init) without placing them on any pending list, an orphaned pair is on no list and referenced by nobody, so it is only reclaimed at driver teardown. Repeated hits progressively exhaust the management-TX pools until alloc_mgtxmitframe() returns NULL and the interface can no longer send beacons or probe/assoc responses.

Free the frame and buffer on these paths, matching the existing correct error handling in issue_assocreq().

  • Published: Sep 25, 2026
  • Updated: Oct 15, 2026
  • CVE: CVE-2026-100076
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Medium
  • Score: 5.5
  • AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWEs:

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CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

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