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CVE-2023-53536 (GCVE-0-2023-53536)

Vulnerability from cvelistv5 – Published: 2025-10-04 15:16 – Updated: 2026-08-05 09:14
VLAI
Title
blk-crypto: make blk_crypto_evict_key() more robust
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-crypto: make blk_crypto_evict_key() more robust If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures. However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key(). These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.) Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure. Also improve some comments.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1b2628397058ebce7277480960b29c788138de90 , < 701a8220762ff90615dc91d3543f789391b63298 (git)
Affected: 1b2628397058ebce7277480960b29c788138de90 , < 5bb4005fb667c6e2188fa87950f8d5faf2994410 (git)
Affected: 1b2628397058ebce7277480960b29c788138de90 , < 64ef787bb1588475163069c2e62fdd8f6c27b1f6 (git)
Affected: 1b2628397058ebce7277480960b29c788138de90 , < 809a5be62e92a444a3c3d7b9f438019d0b322f55 (git)
Affected: 1b2628397058ebce7277480960b29c788138de90 , < 5c62852942667c613de0458fc797c5b8c36112b5 (git)
Affected: 1b2628397058ebce7277480960b29c788138de90 , < 5c7cb94452901a93e90c2230632e2c12a681bc92 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.180 , ≤ 5.10.* (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The vulnerable path is reached through ordinary filesystem syscalls (create/write/unlink causing inode eviction) on a locally-mounted fscrypt-encrypted volume backed by UFS/eMMC inline-crypto hardware; there is no remote protocol handler involved.\nAC:L - The attacker drives the eviction side of the race directly and can retry unboundedly \u2014 a tight create/write/unlink loop over per-file-key files generates thousands of `blk_crypto_evict_key()` calls per second against in-flight blk-mq requests, and UFS runtime-PM resume (which calls `blk_crypto_reprogram_all_keys()`) can be induced by alternating I/O bursts with idle periods.\nPR:L - Only an unprivileged local account with write access to an fscrypt-encrypted directory is needed \u2014 any sandboxed Android app in its own `/data/data` directory, or any user with an encrypted home \u2014 and no capability or namespace check exists anywhere on the path from `evict_inode()` to `__blk_crypto_evict_key()`.\nUI:N - The attacker performs every step itself \u2014 writing files, forcing inode eviction, and idling the device to provoke a controller reset \u2014 with no action required from any other user or administrator.\nS:U - The use-after-free occurs on a kernel heap object and is exploited within the kernel\u0027s own security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The freed object is a `struct blk_crypto_key` holding raw key material, and `blk_crypto_reprogram_all_keys()` reads it after free and programs the (groomable) contents into a hardware keyslot; additionally the stale pointer-keyed hash entry causes a reallocated key to reuse a slot holding a different key, exposing file plaintext across encryption boundaries, and the UAF read primitive is generally leverageable for kernel memory disclosure.\nI:H - A use-after-free on a slab object whose lifetime the attacker controls permits heap spraying to place attacker-chosen data where the kernel expects a key, yielding a write/control primitive; independently, the wrong-key confusion silently encrypts user data at rest under the wrong key, corrupting it irrecoverably.\nA:H - Dereferencing the freed `blk_crypto_key` in `blk_crypto_reprogram_all_keys()` causes an oops or panic (plus the `WARN_ON_ONCE`/`WARN_ON` splats), and the attacker can repeat the trigger loop indefinitely to crash the system."
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(Note, these errors *shouldn\u0027t* happen; we\u0027re just\\ntalking about what happens if they do anyway.)\\n\\nFix this by making blk_crypto_evict_key() unlink the key from the\\nkeyslot management structures even on failure.\\n\\nAlso improve some 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T20:02:49+00:00",
      "cve": "CVE-2023-53536",
      "id": "CVE-2023-53536",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: blk-crypto: make blk_crypto_evict_key() more robust",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53536.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:57:45Z",
      "cve": "CVE-2023-53536",
      "id": "CVE-2023-53536",
      "initial_release_date": "2025-10-05T02:56:44Z",
      "product_status:known_affected": "171",
      "product_status:known_not_affected": "352",
      "product_status:recommended": "29",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53536",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53536.json",
      "version": "11"
    }
  }
}



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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.

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  • 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.
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  • 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.


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