CVE-2026-90069 (GCVE-0-2026-90069)
Vulnerability from cvelistv5
Published
2026-09-17 16:05
Modified
2026-10-19 08:57
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: acomp - allocate async request context when cloning ACOMP_REQUEST_ON_STACK() reserves only enough storage for the synchronous fallback. When an async implementation is selected, callers clone that stack request before retrying, but acomp_request_clone() currently copies only the stack-sized object. The clone therefore has no storage for the async provider request context, and providers such as QAT write past the allocation through acomp_request_ctx(). KASAN does report a slab OOB write. Allocate a zeroed clone large enough for the runtime acomp request size, copy only the bytes present in the source object, and preserve the existing fallback-on-allocation-failure behavior. Use the runtime reqsize because an implementation may adjust it during tfm initialization.
References
Impacted products
Vendor Product Version
Linux Linux Version: 097c432caaa6d91f87732fe991cb08139e31101a
Version: 097c432caaa6d91f87732fe991cb08139e31101a
Version: 097c432caaa6d91f87732fe991cb08139e31101a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "crypto/acompress.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "097c432caaa6d91f87732fe991cb08139e31101a",
              "versionType": "git"
            },
            {
              "lessThan": "889fa17a0af09ff93a9166abc82ee7a654faa49b",
              "status": "affected",
              "version": "097c432caaa6d91f87732fe991cb08139e31101a",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "097c432caaa6d91f87732fe991cb08139e31101a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "crypto/acompress.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - allocate async request context when cloning\n\nACOMP_REQUEST_ON_STACK() reserves only enough storage for the\nsynchronous fallback. When an async implementation is selected, callers\nclone that stack request before retrying, but acomp_request_clone()\ncurrently copies only the stack-sized object. The clone therefore has no\nstorage for the async provider request context, and providers such as QAT\nwrite past the allocation through acomp_request_ctx(). KASAN does report\na slab OOB write.\n\nAllocate a zeroed clone large enough for the runtime acomp request size,\ncopy only the bytes present in the source object, and preserve the\nexisting fallback-on-allocation-failure behavior. Use the runtime reqsize\nbecause an implementation may adjust it during tfm initialization."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The undersized clone is produced only by ACOMP_REQUEST_CLONE in ubifs_compress_common()/ubifs_decompress_common(), reached from local VFS writeback (write/fsync \u2192 ubifs_writepage \u2192 do_writepage \u2192 ubifs_jnl_write_data \u2192 ubifs_compress_folio) or read (ubifs_read_folio \u2192 read_block \u2192 ubifs_decompress_folio). IPComp uses acomp_request_alloc_extra() and never clones, so no protocol message carries this bug.\nAC:L - When UBIFS\u0027s compressor tfm is async, crypto_acomp_compress()/crypto_acomp_decompress() return -EAGAIN for every ACOMP_REQUEST_ON_STACK request, and the following ACOMP_REQUEST_CLONE plus QAT qat_comp_alg_compress_decompress() write through acomp_request_ctx() always overflows the kmemdup; there is no race or uninfluenced layout to win.\nPR:L - An unprivileged user with write permission on a UBIFS inode that inherited UBIFS_COMPR_FL triggers the clone by writing \u2265 UBIFS_MIN_COMPR_LEN bytes and fsync(); ubifs_fs_type has no FS_USERNS_MOUNT, but an already-mounted volume needs no capability beyond ordinary file write access.\nUI:N - The attacker creates and writes their own file on the mounted UBIFS volume and forces writeback with fsync() into ubifs_jnl_write_data(); no other user must mount an image or open a file.\nS:U - qat_comp_alg_compress_decompress() writes struct qat_compression_req through acomp_request_ctx() into kernel slab adjacent to the clone; the corruption stays in kernel memory and does not cross a VM, IOMMU, or guest/host boundary.\nC:H - The entire qat_compression_req (firmware request, DMA buffer pointers, qat_compression_ctx * and acomp_req *) is stored past the kmemdup of sizeof(struct acomp_req), so qat_comp_generic_callback() later reads those fields from neighboring slab objects, giving an arbitrary kernel read after heap grooming.\nI:H - qat_comp_alg_compress_decompress() performs a slab out-of-bounds write of sizeof(struct qat_compression_req) via acomp_request_ctx() on the clone, overwriting adjacent heap objects including function pointers and providing a control-flow hijack and arbitrary-write primitive.\nA:H - KASAN reports a slab out-of-bounds write through acomp_request_ctx() on the undersized clone, and overflowing qat_compression_req into the next slab object oopses or panics on the QAT callback or allocator integrity check."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:57:26.441Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d48197cbd5d3476c7deea644972e9ec510865ec2"
        },
        {
          "url": "https://git.kernel.org/stable/c/889fa17a0af09ff93a9166abc82ee7a654faa49b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee440d4fc0d2f15894ab1f64c474a3adbc858880"
        }
      ],
      "title": "crypto: acomp - allocate async request context when cloning",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90069",
    "datePublished": "2026-09-17T16:05:50.894Z",
    "dateReserved": "2026-09-11T19:38:34.784Z",
    "dateUpdated": "2026-10-19T08:57:26.441Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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