CVE-2026-43502
Description
In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 7.0.7-1 |
| debian | sid | fixed | 7.0.7-1 |
| debian | trixie | fixed | 6.12.88-1 |
| windows | affected | |
References
- https://git.kernel.org/stable/c/0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b
- https://git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993e
- https://git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275e
- https://git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46
- https://git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108fa
- https://www.suse.com/security/cve/CVE-2026-43502.html
- https://security-tracker.debian.org/tracker/CVE-2026-43502
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43502
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.