CVE-2026-43502
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0f5c185fc79a59ee9991234dd6d2a3e5afa6e75bPatch
- https://git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993ePatch
- https://git.kernel.org/stable/c/1e262db7675e27f42c3f3f47d6011855f4454f24Patch
- https://git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275ePatch
- https://git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46Patch
- https://git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108faPatch
- https://git.kernel.org/stable/c/46662f7dc59475995609bf3e9d27eb36f4acf26fPatch
- https://git.kernel.org/stable/c/e9aefdc5c53fe9aed108c14e3d155710a1bb14c9Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.