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CVE-2023-53599

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

crypto: af_alg - Fix missing initialisation affecting gcm-aes-s390

Fix af_alg_alloc_areq() to initialise areq->first_rsgl.sgl.sgt.sgl to point to the scatterlist array in areq->first_rsgl.sgl.sgl.

Without this, the gcm-aes-s390 driver will oops when it tries to do gcm_walk_start() on req->dst because req->dst is set to the value of areq->first_rsgl.sgl.sgl by _aead_recvmsg() calling aead_request_set_crypt().

The problem comes if an empty ciphertext is passed: the loop in af_alg_get_rsgl() just passes straight out and doesn't set areq->first_rsgl up.

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This isn't a problem on x86_64 using gcmaes_crypt_by_sg() because, as far as I can tell, that ignores req->dst and only uses req->src[*].

[*] Is this a bug in aesni-intel_glue.c?

The s390x oops looks something like:

Detalles técnicos trazas, registros y código del informe original
 Unable to handle kernel pointer dereference in virtual kernel address space
 Failing address: 0000000a00000000 TEID: 0000000a00000803
 Fault in home space mode while using kernel ASCE.
 AS:00000000a43a0007 R3:0000000000000024
 Oops: 003b ilc:2 [#1] SMP
 ...
 Call Trace:
  [<000003ff7fc3d47e>] gcm_walk_start+0x16/0x28 [aes_s390]
  [<00000000a2a342f2>] crypto_aead_decrypt+0x9a/0xb8
  [<00000000a2a60888>] aead_recvmsg+0x478/0x698
  [<00000000a2e519a0>] sock_recvmsg+0x70/0xb0
  [<00000000a2e51a56>] sock_read_iter+0x76/0xa0
  [<00000000a273e066>] vfs_read+0x26e/0x2a8
  [<00000000a273e8c4>] ksys_read+0xbc/0x100
  [<00000000a311d808>] __do_syscall+0x1d0/0x1f8
  [<00000000a312ff30>] system_call+0x70/0x98
 Last Breaking-Event-Address:
  [<000003ff7fc3e6b4>] gcm_aes_crypt+0x104/0xa68 [aes_s390]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2023-53599",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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              "lessThanOrEqual": "*"
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          "programFiles": [
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          "defaultStatus": "affected"
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  "published": "2025-10-04T16:15:56.497",
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      "description": [
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          "value": "CWE-476"
        }
      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Fix missing initialisation affecting gcm-aes-s390\n\nFix af_alg_alloc_areq() to initialise areq->first_rsgl.sgl.sgt.sgl to point\nto the scatterlist array in areq->first_rsgl.sgl.sgl.\n\nWithout this, the gcm-aes-s390 driver will oops when it tries to do\ngcm_walk_start() on req->dst because req->dst is set to the value of\nareq->first_rsgl.sgl.sgl by _aead_recvmsg() calling\naead_request_set_crypt().\n\nThe problem comes if an empty ciphertext is passed: the loop in\naf_alg_get_rsgl() just passes straight out and doesn't set areq->first_rsgl\nup.\n\nThis isn't a problem on x86_64 using gcmaes_crypt_by_sg() because, as far\nas I can tell, that ignores req->dst and only uses req->src[*].\n\n[*] Is this a bug in aesni-intel_glue.c?\n\nThe s390x oops looks something like:\n\n Unable to handle kernel pointer dereference in virtual kernel address space\n Failing address: 0000000a00000000 TEID: 0000000a00000803\n Fault in home space mode while using kernel ASCE.\n AS:00000000a43a0007 R3:0000000000000024\n Oops: 003b ilc:2 [#1] SMP\n ...\n Call Trace:\n  [<000003ff7fc3d47e>] gcm_walk_start+0x16/0x28 [aes_s390]\n  [<00000000a2a342f2>] crypto_aead_decrypt+0x9a/0xb8\n  [<00000000a2a60888>] aead_recvmsg+0x478/0x698\n  [<00000000a2e519a0>] sock_recvmsg+0x70/0xb0\n  [<00000000a2e51a56>] sock_read_iter+0x76/0xa0\n  [<00000000a273e066>] vfs_read+0x26e/0x2a8\n  [<00000000a273e8c4>] ksys_read+0xbc/0x100\n  [<00000000a311d808>] __do_syscall+0x1d0/0x1f8\n  [<00000000a312ff30>] system_call+0x70/0x98\n Last Breaking-Event-Address:\n  [<000003ff7fc3e6b4>] gcm_aes_crypt+0x104/0xa68 [aes_s390]"
    }
  ],
  "lastModified": "2026-08-04T10:19:13.967",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "6.5.3",
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}