Improper Input Validation Affecting kernel-core package, versions *
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Test your applications- Snyk ID SNYK-RHEL9-KERNELCORE-6548206
- published 18 Apr 2024
- disclosed 3 Apr 2024
Introduced: 3 Apr 2024
CVE-2024-26712 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:9
kernel-core
.
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:
powerpc/kasan: Fix addr error caused by page alignment
In kasan_init_region, when k_start is not page aligned, at the begin of
for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then
va = block + k_cur - k_start
is less than block, the addr va is invalid,
because the memory address space from va to block is not alloced by
memblock_alloc, which will not be reserved by memblock_reserve later, it
will be used by other places.
As a result, memory overwriting occurs.
for example: int __init __weak kasan_init_region(void start, size_t size) { [...] / if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) / block = memblock_alloc(k_end - k_start, PAGE_SIZE); [...] for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { / at the begin of for loop * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400) * va(dcd96c00) is less than block(dcd97000), va is invalid */ void *va = block + k_cur - k_start; [...] } [...] }
Therefore, page alignment is performed on k_start before memblock_alloc() to ensure the validity of the VA address.
References
- https://access.redhat.com/security/cve/CVE-2024-26712
- https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe
- https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058
- https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882
- https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6
- https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0
- https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html