Description
In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before replacing page cache folio fuse_try_move_folio() unlocks the request on entry but does not re-lock it on the success path. This means fuse_chan_abort() can end the request and free the fuse_io_args (eg fuse_readpages_end()) while the subsequent copy chain logic after fuse_try_move_folio() accesses the fuse_io_args, leading to use-after-free issues. Fix this by calling lock_request() before replace_page_cache_folio(). This ensures the request is locked on the success path which will prevent the fuse_io_args from being freed while the later copying logic runs, and also ensures that the ap->folios[i]->mapping is never null since ap->folios[i] will always point to the newfolio after replace_page_cache_folio().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ce534fb052928ce556639d7ecf01cbf4e01321e1 to < 7c18691e0cfda29672f79bafde8abdb7710674f6affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < 5927b43a4f8d89e86930f524bf63e9c7e66f61b4affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < 030fe3e9d8abdee303dd7e9e42f45082d382a407affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < 46473ddccdc5065033e397d6e62c280dbcd3d9c2affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < af2892249d982a1c036ca456cc135374e68b6677affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < 0223f452532d9cd8a5e87c45de828fd93c99bd25affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < e28db6ac4792d065ab32565fd9f0a2361c3d4666affectedce534fb052928ce556639d7ecf01cbf4e01321e1 to < a078484921052d0badd827fcc2770b5cfc1d4120affected
Linux Linux
Default version status: affected
2.6.35affected0 to < 2.6.35unaffected5.15.211 to ≤ 5.15.*unaffected6.1.177 to ≤ 6.1.*unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.37 to ≤ 6.18.*unaffected7.0.14 to ≤ 7.0.*unaffected7.1.2 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7c18691e0cfda29672f79bafde8abdb7710674f6 ↗
- https://git.kernel.org/stable/c/5927b43a4f8d89e86930f524bf63e9c7e66f61b4 ↗
- https://git.kernel.org/stable/c/030fe3e9d8abdee303dd7e9e42f45082d382a407 ↗
- https://git.kernel.org/stable/c/46473ddccdc5065033e397d6e62c280dbcd3d9c2 ↗
- https://git.kernel.org/stable/c/af2892249d982a1c036ca456cc135374e68b6677 ↗
- https://git.kernel.org/stable/c/0223f452532d9cd8a5e87c45de828fd93c99bd25 ↗
- https://git.kernel.org/stable/c/e28db6ac4792d065ab32565fd9f0a2361c3d4666 ↗
- https://git.kernel.org/stable/c/a078484921052d0badd827fcc2770b5cfc1d4120 ↗