{"id":"CVE-2026-53047","title":"efi/capsule-loader: fix incorrect sizeof in phys array reallocation","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nefi/capsule-loader: fix incorrect sizeof in phys array reallocation\n\nThe krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses\nsizeof(phys_addr_t *) ins…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 22022cd8851703a58f67615a17bc7e9e8682785b","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 67adde6bfdfd563a54b045d59aeb9a2d90c80697","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 608e1f7bc9d171ab26c1fba288c97fc76363c27d","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 8be69e9245f805566bac68ffc8574b64735fd996","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 5e185330d902b12fe8e6eb4b8514b5d736d8d66d","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < e0e6b14995fd6fa2c0df8c712d76ab32f0694c31","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < ab3f7098a3a27175b91cfc947950f5c26855801b","Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 48a428215782321b56956974f23593e40ce84b7a","Linux 95a362c9a6892085f714eb6e31eea6a0e3aa93bf","Linux >= 4.14.13 < 4.15","Linux 4.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:17:08.543367Z"},"published":"2026-06-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:23:56.769Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53047","references":[{"url":"https://git.kernel.org/stable/c/22022cd8851703a58f67615a17bc7e9e8682785b"},{"url":"https://git.kernel.org/stable/c/67adde6bfdfd563a54b045d59aeb9a2d90c80697"},{"url":"https://git.kernel.org/stable/c/608e1f7bc9d171ab26c1fba288c97fc76363c27d"},{"url":"https://git.kernel.org/stable/c/8be69e9245f805566bac68ffc8574b64735fd996"},{"url":"https://git.kernel.org/stable/c/5e185330d902b12fe8e6eb4b8514b5d736d8d66d"},{"url":"https://git.kernel.org/stable/c/e0e6b14995fd6fa2c0df8c712d76ab32f0694c31"},{"url":"https://git.kernel.org/stable/c/ab3f7098a3a27175b91cfc947950f5c26855801b"},{"url":"https://git.kernel.org/stable/c/48a428215782321b56956974f23593e40ce84b7a"}],"tags":["cve.org"],"epss":0.00176,"epssPercentile":0.07092,"ingestedAt":"2026-11-06T16:57:43.303Z","slug":"CVE-2026-53047","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nefi/capsule-loader: fix incorrect sizeof in phys array reallocation\n\nThe krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses\nsizeof(phys_addr_t *) instead of sizeof(phys_addr_t), which might be\ncausing an undersized allocation.\n\nThe allocation is also inconsistent with the initial array allocation in\nefi_capsule_open() that allocates one entry with sizeof(phys_addr_t),\nand the efi_capsule_write() function that stores phys_addr_t values (not\npointers) via page_to_phys().\n\nOn 64-bit systems where sizeof(phys_addr_t) == sizeof(phys_addr_t *), this\ngoes unnoticed. On 32-bit systems with PAE where phys_addr_t is 64-bit but\npointers are 32-bit, this allocates half the required space, which might\nlead to a heap buffer overflow when storing physical addresses.\n\nThis is similar to the bug fixed in commit fccfa646ef36 (\"efi/capsule-loader:\nfix incorrect allocation size\") which fixed the same issue at the initial\nallocation site.\n\n## Affected\n\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 22022cd8851703a58f67615a17bc7e9e8682785b`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 67adde6bfdfd563a54b045d59aeb9a2d90c80697`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 608e1f7bc9d171ab26c1fba288c97fc76363c27d`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 8be69e9245f805566bac68ffc8574b64735fd996`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 5e185330d902b12fe8e6eb4b8514b5d736d8d66d`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < e0e6b14995fd6fa2c0df8c712d76ab32f0694c31`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < ab3f7098a3a27175b91cfc947950f5c26855801b`\n- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 48a428215782321b56956974f23593e40ce84b7a`\n- `Linux 95a362c9a6892085f714eb6e31eea6a0e3aa93bf`\n- `Linux >= 4.14.13 < 4.15`\n- `Linux 4.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}