CVE-2024-42152: nvmet: fix a possible leak when destroy a ctrl during qp establishment
First published: Tue Jul 30 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nvmet: fix a possible leak when destroy a ctrl during qp establishment In nvmet_sq_destroy we capture sq->ctrl early and if it is non-NULL we know that a ctrl was allocated (in the admin connect request handler) and we need to release pending AERs, clear ctrl->sqs and sq->ctrl (for nvme-loop primarily), and drop the final reference on the ctrl. However, a small window is possible where nvmet_sq_destroy starts (as a result of the client giving up and disconnecting) concurrently with the nvme admin connect cmd (which may be in an early stage). But *before* kill_and_confirm of sq->ref (i.e. the admin connect managed to get an sq live reference). In this case, sq->ctrl was allocated however after it was captured in a local variable in nvmet_sq_destroy. This prevented the final reference drop on the ctrl. Solve this by re-capturing the sq->ctrl after all inflight request has completed, where for sure sq->ctrl reference is final, and move forward based on that. This issue was observed in an environment with many hosts connecting multiple ctrls simoutanuosly, creating a delay in allocating a ctrl leading up to this race window.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.8<5.10.222 | |
| Linux Linux kernel | >=5.11<5.15.163 | |
| Linux Linux kernel | >=5.16<6.1.98 | |
| Linux Linux kernel | >=6.2<6.6.39 | |
| Linux Linux kernel | >=6.7<6.9.9 | |
| Linux Linux kernel | =6.10-rc1 | |
| redhat/kernel | <5.10.222 | 5.10.222 |
| redhat/kernel | <5.15.163 | 5.15.163 |
| redhat/kernel | <6.1.98 | 6.1.98 |
| redhat/kernel | <6.6.39 | 6.6.39 |
| redhat/kernel | <6.9.9 | 6.9.9 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.9-1 6.11.10-1 |
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Reference Links
- https://git.kernel.org/stable/c/2f3c22b1d3d7e86712253244797a651998c141fa
- https://git.kernel.org/stable/c/5502c1f1d0d7472706cc1f201aecf1c935d302d1
- https://git.kernel.org/stable/c/818004f2a380420c19872171be716174d4985e33
- https://git.kernel.org/stable/c/940a71f08ef153ef807f751310b0648d1fa5d0da
- https://git.kernel.org/stable/c/b4fed1443a6571d49c6ffe7d97af3bbe5ee6dff5
- https://git.kernel.org/stable/c/c758b77d4a0a0ed3a1292b3fd7a2aeccd1a169a4
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42152
- https://nvd.nist.gov/vuln/detail/CVE-2024-42152
- https://launchpad.net/bugs/cve/CVE-2024-42152
- https://security-tracker.debian.org/tracker/CVE-2024-42152
- https://ubuntu.com/security/CVE-2024-42152
- https://git.kernel.org/linus/c758b77d4a0a0ed3a1292b3fd7a2aeccd1a169a4
- https://lore.kernel.org/linux-cve-announce/2024073034-CVE-2024-42152-c248@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2302019
- https://access.redhat.com/errata/RHSA-2024:5928
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:8614
- https://access.redhat.com/errata/RHSA-2024:8613
- https://bugzilla.redhat.com/show_bug.cgi?id=2301519
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