CVE-2024-46688: erofs: fix out-of-bound access when z_erofs_gbuf_growsize() partially fails

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-13 · updated 2026-06-17
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix out-of-bound access when z_erofs_gbuf_growsize() partially fails If z_erofs_gbuf_growsize() partially fails on a global buffer due to memory allocation failure or fault injection (as reported by syzbot [1]), new pages need to be freed by comparing to the existing pages to avoid memory leaks. However, the old gbuf->pages[] array may not be large enough, which can lead to null-ptr-deref or out-of-bound access. Fix this by checking against gbuf->nrpages in advance. [1] https://lore.kernel.org/r/000000000000f7b96e062018c6e3@google.com

Affected products

Linux kernel: from 6.10 before 6.10.8; 6.11-rc1, 6.11-rc2, 6.11-rc3, 6.11-rc4 — fixed in 6.10.8

How to fix

Upgrade to a fixed version: Linux kernel 6.10.8. Check the vendor advisory for mitigations.

References

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