CVE-2026-63952: Linux, състезание за ресурс

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: memfd: deny writeable mappings when implying SEAL_WRITE When SEAL_EXEC is added, SEAL_WRITE is implied to make W^X. But the implied seal is set after the check that makes sure the memfd can not have any writable mappings. This means one can use SEAL_EXEC to apply SEAL_WRITE while having writeable mappings. This breaks the contract that SEAL_WRITE provides and can be used by an attacker to pass a memfd that appears to be write sealed but can still be modified arbitrarily. Fix this by adding the implied seals before the call for mapping_deny_writable() is done.

Засегнати продукти

• Linux Linux: c4f75bc8bd6b3d62665e1f5400c419540edb5601 преди b3f4f82d1315f1439059a83d1c22c51a5b43d99e; c4f75bc8bd6b3d62665e1f5400c419540edb5601 преди 3be2a24f7f72ad7321ed6ad1715b956a4527bcf4; c4f75bc8bd6b3d62665e1f5400c419540edb5601 преди 0995d1f79aed8ccbf62056189dd53fd19726ea08; c4f75bc8bd6b3d62665e1f5400c419540edb5601 преди 555702282d4536a865dfffb1cd4f6028f196e7e8; c4f75bc8bd6b3d62665e1f5400c419540edb5601 преди 3b041514cb6eae45869b020f743c14d983363222
• Linux Linux: 6.3; преди 6.3; 6.6.143 до 6.6.*; 6.12.93 до 6.12.*; 6.18.35 до 6.18.*; 7.0.12 до 7.0.*; от 7.1 нататък

Вид слабост

• CWE-362 Неправилна синхронизация при споделен ресурс (Race Condition)

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-63952
• https://nvd.nist.gov/vuln/detail/CVE-2026-63952
• https://git.kernel.org/stable/c/b3f4f82d1315f1439059a83d1c22c51a5b43d99e
• https://git.kernel.org/stable/c/3be2a24f7f72ad7321ed6ad1715b956a4527bcf4
• https://git.kernel.org/stable/c/0995d1f79aed8ccbf62056189dd53fd19726ea08
• https://git.kernel.org/stable/c/555702282d4536a865dfffb1cd4f6028f196e7e8
• https://git.kernel.org/stable/c/3b041514cb6eae45869b020f743c14d983363222