CVE-2026-90069 (GCVE-0-2026-90069)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:05 – Updated: 2026-09-18 17:52
VLAI
Title
crypto: acomp - allocate async request context when cloning
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.
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: 097c432caaa6d91f87732fe991cb08139e31101a , < d48197cbd5d3476c7deea644972e9ec510865ec2 (git)
Affected: 097c432caaa6d91f87732fe991cb08139e31101a , < 889fa17a0af09ff93a9166abc82ee7a654faa49b (git)
Affected: 097c432caaa6d91f87732fe991cb08139e31101a , < ee440d4fc0d2f15894ab1f64c474a3adbc858880 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "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."
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            "version": "3.1"
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            {
              "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."
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    "dateReserved": "2026-09-11T19:38:34.784Z",
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            "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."
          }
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        "id": "CVE-2026-90069",
        "lastModified": "2026-09-18T18:17:40.710",
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}



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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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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.