CVSS 5.5 · Medium EPSS 0,14%
Kerentanan pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: cifs: Release folio lock on fscache read hit. Under the current code, when cifs_readpage_worker is called, the call contract is that the callee should unlock the page. This is documented in the read_folio section of Documentation/filesystems/vfs.rst as: > The filesystem should unlock the folio once the read has completed, > whether it was successful or not. Without this change, when fscache is in use and cache hit occurs during a read, the page lock is leaked, producing the following stack on subsequent reads (via mmap) to the page: $ cat /proc/3890/task/12864/stack [<0>] folio_wait_bit_common+0x124/0x350 [<0>] filemap_read_folio+0xad/0xf0 [<0>] filemap_fault+0x8b1/0xab0 [<0>] __do_fault+0x39/0x150 [<0>] do_fault+0x25c/0x3e0 [<0>] __handle_mm_fault+0x6ca/0xc70 [<0>] handle_mm_fault+0xe9/0x350 [<0>] do_user_addr_fault+0x225/0x6c0 [<0>] exc_page_fault+0x84/0x1b0 [<0>] asm_exc_page_fault+0x27/0x30 This requires a reboot to resolve; it is a deadlock. Note however that the call to cifs_readpage_from_fscache does mark the page clean, but does not free the folio lock. This happens in __cifs_readpage_from_fscache on success. Releasing the lock at that point however is not appropriate as cifs_readahead also calls cifs_readpage_from_fscache and *does* unconditionally release the lock after its return. This change therefore effectively makes cifs_readpage_worker work like cifs_readahead.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 5.17.1 hingga sebelum 6.1.47 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.4.12 |
| linux | linux kernel | Versi 5.17 |
| linux | linux kernel | Versi 5.17 rc3 |
| linux | linux kernel | Versi 5.17 rc4 |
| linux | linux kernel | Versi 5.17 rc5 |
| linux | linux kernel | Versi 5.17 rc6 |
| linux | linux kernel | Versi 5.17 rc7 |
| linux | linux kernel | Versi 5.17 rc8 |
| linux | linux kernel | Versi 6.5 rc1 |
| linux | linux kernel | Versi 6.5 rc2 |
| linux | linux kernel | Versi 6.5 rc3 |
| linux | linux kernel | Versi 6.5 rc4 |
| linux | linux kernel | Versi 6.5 rc5 |
| linux | linux kernel | Versi 6.5 rc6 |