CVE-2025-39789 (GCVE-0-2025-39789)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:56 – Updated: 2026-08-05 12:05
VLAI
Title
crypto: x86/aegis - Add missing error checks
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: x86/aegis - Add missing error checks The skcipher_walk functions can allocate memory and can fail, so checking for errors is necessary.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1d373d4e8e15b358f08de52956b32e0e38a11f84 , < 475104178f4d30e749ee4f5473c87f692b93bebb (git)
Affected: 1d373d4e8e15b358f08de52956b32e0e38a11f84 , < 3d9eb180fbe8828cce43bce4c370124685b205c3 (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "arch/x86/crypto/aegis128-aesni-glue.c"
          ],
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              "value": "AV:L - The AEGIS-128 AEAD is driven from the local crypto API \u2014 an unprivileged user reaches it directly via an AF_ALG/algif_aead socket, and in-kernel consumers (dm-crypt, xfrm ESP) are configured locally. A remote peer cannot itself supply input that reaches the failing allocation, so this is local.\nAC:L - The failure requires a memory allocation failure inside skcipher_walk, but the attacker can both force the allocating slow path on every walk step (by submitting scatterlists fragmented below the 16-byte chunksize) and induce the memory pressure, then retry the operation arbitrarily many times; the GFP_ATOMIC variant used by softirq consumers fails readily under attacker-generated load.\nPR:L - Binding an AF_ALG socket to \"aegis128\" and issuing encrypt requests requires only an unprivileged local account \u2014 no capability, and module autoload happens on the user\u0027s behalf.\nUI:N - The attacker triggers the encrypt/decrypt path entirely on their own; no victim action is needed.\nS:U - The faulty error handling and its consequences stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - On the unchecked error path the encrypt call returns success without encrypting, so the \"ciphertext\" handed to the caller is the raw plaintext (in-place operations) or stale kernel buffer contents (out-of-place, e.g. dm-crypt/ESP buffers), disclosing data that was supposed to be protected to disk, network peers, or backups.\nI:H - The kernel reports a successful AEAD operation while producing unencrypted, partially encrypted, or stale output with a mismatched tag, so data written to encrypted storage or an encrypted tunnel is silently wrong and cannot be distinguished from valid output by the caller.\nA:L - No kernel crash, hang, or corruption occurs; the impact is that the silently bad ciphertext/tag causes downstream rejection \u2014 dropped IPsec packets, I/O errors on integrity-protected volumes, and unrecoverable stored blocks \u2014 which is a limited interruption rather than a full loss of availability."
            }
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      "title": "crypto: x86/aegis - Add missing error checks",
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    "cveId": "CVE-2025-39789",
    "datePublished": "2025-09-11T16:56:37.912Z",
    "dateReserved": "2025-04-16T07:20:57.131Z",
    "dateUpdated": "2026-08-05T12:05:09.715Z",
    "state": "PUBLISHED"
  },
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      "epss": "0.00125",
      "percentile": "0.02603"
    },
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      "initial_release_date": "2025-09-02T00:00:00.000Z",
      "product_status:known_affected": "19",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "crypto: x86/aegis - Add missing error checks",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39789.json",
      "version": "16"
    },
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:38:10+00:00",
      "cve": "CVE-2025-39789",
      "id": "CVE-2025-39789",
      "initial_release_date": "2025-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: x86/aegis - Add missing error checks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39789.json",
      "version": "3"
    }
  }
}



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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.