CVE-2024-26630
In the Linux kernel, the following vulnerability has been resolved: mm: cachestat: fix folio read-after-free in cache walk In cachestat, we access the folio from the page cache's xarray to compute its page offset, and check for its dirty and writeback…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: mm: cachestat: fix folio read-after-free in cache walk In cachestat, we access the folio from the page cache's xarray to compute its page offset, and check for its dirty and writeback flags. However, we do not hold a reference to the folio before performing these actions, which means the folio can concurrently be released and reused as another folio/page/slab. Get around this altogether by just using xarray's existing machinery for the folio page offsets and dirty/writeback states. This changes behavior for tmpfs files to now always report zeroes in their dirty and writeback counters. This is okay as tmpfs doesn't follow conventional writeback cache behavior: its pages get "cleaned" during swapout, after which they're no longer resident etc.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.30% probability · 23th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/3a75cb05d53f4a6823a32deb078de1366954a804Patch
- https://git.kernel.org/stable/c/ba60fdf75e89ea762bb617be578dc47f27655117Patch
- https://git.kernel.org/stable/c/fe7e008e0ce728252e4ec652cceebcc62211657cPatch
- https://git.kernel.org/stable/c/3a75cb05d53f4a6823a32deb078de1366954a804Patch
- https://git.kernel.org/stable/c/ba60fdf75e89ea762bb617be578dc47f27655117Patch
- https://git.kernel.org/stable/c/fe7e008e0ce728252e4ec652cceebcc62211657cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.