Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix writes_pending and barrier reference leaks on discard failures raid10_make_request() acquires a writes_pending reference with md_write_start() before calling raid10_handle_discard(). Several failure paths in raid10_handle_discard() complete the bio and return without releasing the corresponding reference, causing md_write_end() to be skipped. Call md_write_end() before returning from these failure paths to keep writes_pending accounting balanced. Additionally, discard split allocation failures can occur after wait_barrier() succeeds. Those paths return without calling allow_barrier(), leaking the associated barrier reference. Release the barrier before returning from those paths.

Affected versions

Linux: c9aa889b035fca4598ae985a0f0c76ebbb547ad2 through before fea33968592559a55a3f5a96a6386bebcaf988a8 (git); c9aa889b035fca4598ae985a0f0c76ebbb547ad2 through before 11b35d1906a7277a3d64afe34224133b44327328 (git); c9aa889b035fca4598ae985a0f0c76ebbb547ad2 through before d1324b41dabd26787559efaeb430643c627c1eb0 (git); c9aa889b035fca4598ae985a0f0c76ebbb547ad2 through before 393d687131d8aa8c7e4de2cb494438e145d20fc2 (git); 39db562b3fedb93978a7e42dd216b306740959f8 (git); 5.15.111 through before 5.16 (semver); 5.17 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.