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CVE-2024-26630 (GCVE-0-2024-26630)

Vulnerability from cvelistv5 – Published: 2024-03-13 15:50 – Updated: 2026-08-05 11:26
VLAI
Title
mm: cachestat: fix folio read-after-free in cache walk
Summary
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-13 19:45 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < ba60fdf75e89ea762bb617be578dc47f27655117 (git)
Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < fe7e008e0ce728252e4ec652cceebcc62211657c (git)
Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < 3a75cb05d53f4a6823a32deb078de1366954a804 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.21 , ≤ 6.6.* (semver)
Unaffected: 6.7.9 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                    "id": "CVE-2024-26630",
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              "shortName": "CISA-ADP"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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                  "version": "6.5"
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                  "value": "AV:L - The vulnerability is reached only through the local `cachestat(2)` system call on an open file descriptor. There is no remote or adjacent-network path to `filemap_cachestat()`.\nAC:L - Although this is a race, the attacker drives both sides of it: one thread loops on `cachestat()` while another loops `POSIX_FADV_DONTNEED`/truncate on a file it owns (e.g. a memfd) plus a slab-spray thread, so the window is created and retried at will with no dependence on conditions outside the attacker\u0027s control.\nPR:L - The syscall performs no capability or permission check beyond `fdget()` \u2014 any unprivileged local user with any open file descriptor can call it, and `CONFIG_CACHESTAT_SYSCALL` is `default y` in stock kernels.\nUI:N - The attacker\u0027s own processes populate the page cache, evict it, and call the syscall; no victim action is needed at any point.\nS:U - The read-after-free occurs in kernel memory and the disclosed data is returned to the calling process within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Reading the freed-and-reused `struct page` leaks stale metadata whose reuse the attacker can groom, and the pointer-sized `folio-\u003eindex` value (SLUB\u0027s `slab.freelist`) is recoverable exactly from the returned `nr_cache` counter, giving repeatable full kernel-heap address disclosure and KASLR defeat.\nI:N - Every access to the freed folio on this path is a read; the results are accumulated into a stack `struct cachestat` copied to the caller\u0027s own buffer, so no kernel memory is modified and no write primitive is created.\nA:H - This is a use-after-free, which crashes even when not exploited: a stale `PG_head` bit sends the read to `page[1]`, which can fault on an unpopulated vmemmap section on memory-hole/hotplug systems, and KASAN-instrumented kernels panic on the UAF report."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26630",
        "datePublished": "2024-03-13T15:50:32.480Z",
        "dateReserved": "2024-02-19T14:20:24.135Z",
        "dateUpdated": "2026-08-05T11:26:23.659Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.