CVE-2026-53047

Description

In the Linux kernel, the following vulnerability has been resolved: efi/capsule-loader: fix incorrect sizeof in phys array reallocation The krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses sizeof(phys_addr_t *) instead of sizeof(phys_addr_t), which might be causing an undersized allocation. The allocation is also inconsistent with the initial array allocation in efi_capsule_open() that allocates one entry with sizeof(phys_addr_t), and the efi_capsule_write() function that stores phys_addr_t values (not pointers) via page_to_phys(). On 64-bit systems where sizeof(phys_addr_t) == sizeof(phys_addr_t *), this goes unnoticed. On 32-bit systems with PAE where phys_addr_t is 64-bit but pointers are 32-bit, this allocates half the required space, which might lead to a heap buffer overflow when storing physical addresses. This is similar to the bug fixed in commit fccfa646ef36 ("efi/capsule-loader: fix incorrect allocation size") which fixed the same issue at the initial allocation site.

PUBLISHED Reserved 2026-06-09 | Published 2026-06-24 | Updated 2026-06-24 | Assigner Linux

Product status

References

git.kernel.org/...c/22022cd8851703a58f67615a17bc7e9e8682785b

git.kernel.org/...c/67adde6bfdfd563a54b045d59aeb9a2d90c80697

git.kernel.org/...c/608e1f7bc9d171ab26c1fba288c97fc76363c27d

git.kernel.org/...c/8be69e9245f805566bac68ffc8574b64735fd996

git.kernel.org/...c/5e185330d902b12fe8e6eb4b8514b5d736d8d66d

git.kernel.org/...c/e0e6b14995fd6fa2c0df8c712d76ab32f0694c31

git.kernel.org/...c/ab3f7098a3a27175b91cfc947950f5c26855801b

git.kernel.org/...c/48a428215782321b56956974f23593e40ce84b7a

cve.org (CVE-2026-53047)

nvd.nist.gov (CVE-2026-53047)

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