NULL Pointer Dereference Affecting kernel-rt-kvm package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTKVM-6274315
- published 24 Feb 2024
- disclosed 22 Feb 2024
Introduced: 22 Feb 2024
CVE-2024-26591 Open this link in a new tabHow to fix?
There is no fixed version for Centos:7 kernel-rt-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix re-attachment branch in bpf_tracing_prog_attach
The following case can cause a crash due to missing attach_btf:
- load rawtp program
- load fentry program with rawtp as target_fd
- create tracing link for fentry program with target_fd = 0
- repeat 3
In the end we have:
prog->aux->dst_trampoline == NULL
tgt_prog == NULL (because we did not provide target_fd to link_create)
prog->aux->attach_btf == NULL (the program was loaded with attach_prog_fd=X)
the program was loaded for tgt_prog but we have no way to find out which one
BUG: kernel NULL pointer dereference, address: 0000000000000058 Call Trace: <TASK> ? __die+0x20/0x70 ? page_fault_oops+0x15b/0x430 ? fixup_exception+0x22/0x330 ? exc_page_fault+0x6f/0x170 ? asm_exc_page_fault+0x22/0x30 ? bpf_tracing_prog_attach+0x279/0x560 ? btf_obj_id+0x5/0x10 bpf_tracing_prog_attach+0x439/0x560 __sys_bpf+0x1cf4/0x2de0 __x64_sys_bpf+0x1c/0x30 do_syscall_64+0x41/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76
Return -EINVAL in this situation.
References
- https://access.redhat.com/security/cve/CVE-2024-26591
- https://git.kernel.org/stable/c/50ae82f080cf87e84828f066c31723b781d68f5b
- https://git.kernel.org/stable/c/6cc9c0af0aa06f781fa515a1734b1a4239dfd2c0
- https://git.kernel.org/stable/c/715d82ba636cb3629a6e18a33bb9dbe53f9936ee
- https://git.kernel.org/stable/c/8c8bcd45e9b10eef12321f08d2e5be33d615509c
- https://git.kernel.org/stable/c/a7b98aa10f895e2569403896f2d19b73b6c95653