CVE-2024-35895 Affecting kernel-core package, versions <0:5.14.0-284.82.1.el9_2
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Test your applications- Snyk ID SNYK-RHEL9-KERNELCORE-7888227
- published 4 Sep 2024
- disclosed 19 May 2024
Introduced: 19 May 2024
CVE-2024-35895 Open this link in a new tabHow to fix?
Upgrade RHEL:9 kernel-core to version 0:5.14.0-284.82.1.el9_2 or higher.
This issue was patched in RHSA-2024:6267.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-core package and not the kernel-core package as distributed by RHEL.
See How to fix? for RHEL:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Prevent lock inversion deadlock in map delete elem
syzkaller started using corpuses where a BPF tracing program deletes elements from a sockmap/sockhash map. Because BPF tracing programs can be invoked from any interrupt context, locks taken during a map_delete_elem operation must be hardirq-safe. Otherwise a deadlock due to lock inversion is possible, as reported by lockdep:
CPU0 CPU1
---- ----
lock(&htab->buckets[i].lock); local_irq_disable(); lock(&host->lock); lock(&htab->buckets[i].lock); <Interrupt> lock(&host->lock);
Locks in sockmap are hardirq-unsafe by design. We expects elements to be deleted from sockmap/sockhash only in task (normal) context with interrupts enabled, or in softirq context.
Detect when map_delete_elem operation is invoked from a context which is not hardirq-unsafe, that is interrupts are disabled, and bail out with an error.
Note that map updates are not affected by this issue. BPF verifier does not allow updating sockmap/sockhash from a BPF tracing program today.
References
- https://access.redhat.com/security/cve/CVE-2024-35895
- https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86
- https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd
- https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5
- https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec
- https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75
- https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058
- https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://git.kernel.org/stable/c/913c30f827e17d8cda1da6eeb990f350d36cb69b