CVE-2025-22036 (GCVE-0-2025-22036)
Vulnerability from cvelistv5
Published
2025-04-16 14:11
Modified
2026-05-11 21:11
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: exfat: fix random stack corruption after get_block When get_block is called with a buffer_head allocated on the stack, such as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in the following race condition situation. <CPU 0> <CPU 1> mpage_read_folio <<bh on stack>> do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer <<keep going>> ... ... ... ... <<bh is not valid out of mpage_read_folio>> . . another_function <<variable A on stack>> put_bh(bh) atomic_dec(bh->b_count) * stack corruption here * This patch returns -EAGAIN if a folio does not have buffers when bh_read needs to be called. By doing this, the caller can fallback to functions like block_read_full_folio(), create a buffer_head in the folio, and then call get_block again. Let's do not call bh_read() with on-stack buffer_head.
References
Impacted products
Vendor Product Version
Linux Linux Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
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