CVE-2026-46081

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46081", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.096Z", "datePublished": "2026-05-27T12:58:19.498Z", "dateUpdated": "2026-08-05T12:29:32.090Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:32.090Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - fix wrong pointer stored by acomp_save_req()\n\nacomp_save_req() stores &req->chain in req->base.data. When\nacomp_reqchain_done() is invoked on asynchronous completion, it receives\n&req->chain as the data argument but casts it directly to struct\nacomp_req. Since data points to the chain member, all subsequent field\naccesses are at a wrong offset, resulting in memory corruption.\n\nThe issue occurs when an asynchronous hardware implementation, such as\nthe QAT driver, completes a request that uses the DMA virtual address\ninterface (e.g. acomp_request_set_src_dma()). This combination causes\ncrypto_acomp_compress() to enter the acomp_do_req_chain() path, which\nsets acomp_reqchain_done() as the completion callback via\nacomp_save_req().\n\nWith KASAN enabled, this manifests as a general protection fault in\nacomp_reqchain_done():\n\n general protection fault, probably for non-canonical address 0xe000040000000000\n KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007]\n RIP: 0010:acomp_reqchain_done+0x15b/0x4e0\n Call Trace:\n <IRQ>\n qat_comp_alg_callback+0x5d/0xa0 [intel_qat]\n adf_ring_response_handler+0x376/0x8b0 [intel_qat]\n adf_response_handler+0x60/0x170 [intel_qat]\n tasklet_action_common+0x223/0x820\n handle_softirqs+0x1ab/0x640\n </IRQ>\n\nFix this by storing the request itself in req->base.data instead of\n&req->chain, so that acomp_reqchain_done() receives the correct pointer.\nSimplify acomp_restore_req() accordingly to access req->chain directly."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The only affected callers reaching the buggy chain path use the virtual-DMA interface from local contexts (UBIFS filesystem I/O); all network-facing acomp users (IPComp) use scatterlists and skip the vulnerable path, so there is no remote vector.\nAC:L - Within an affected configuration (async hardware accelerator bound to the compressor), ordinary compress/decompress operations deterministically take the async completion path and corrupt memory; there is no race to win or attacker-uncontrolled state required to trigger it.\nPR:L - Triggering requires only local read/write access to a UBIFS-backed file, which an ordinary unprivileged user has on systems where UBIFS holds user-accessible data; no elevated capability is needed.\nUI:N - The attacker triggers (de)compression through their own file operations; no action by another user is required.\nS:U - The corruption is confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Casting the chain pointer to a request struct causes out-of-bounds reads and dereferences at wrong offsets, and this memory corruption can be leveraged for kernel information disclosure.\nI:H - The bug performs out-of-bounds writes (e.g. via acomp_request_set_src_dma at the wrong offset) and calls a function pointer fetched from a wrong offset, providing a control-flow-hijack and arbitrary-write primitive.\nA:H - The wrong-offset dereference produces a confirmed general protection fault / kernel panic in IRQ/tasklet context, crashing the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/acompress.c"], "versions": [{"version": "64929fe8c0a43508eee952cf57903a61c52601e7", "lessThan": "343a5bf68a8ff9affcf2b70677ea4cf40c195ee4", "status": "affected", "versionType": "git"}, {"version": "64929fe8c0a43508eee952cf57903a61c52601e7", "lessThan": "1a2785e5985627f2265ba7775949601a29ba0d1e", "status": "affected", "versionType": "git"}, {"version": "64929fe8c0a43508eee952cf57903a61c52601e7", "lessThan": "d7e20b9bd6c990773cf0c09e2642250b8a70263d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/acompress.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"}, {"url": "https://git.kernel.org/stable/c/1a2785e5985627f2265ba7775949601a29ba0d1e"}, {"url": "https://git.kernel.org/stable/c/d7e20b9bd6c990773cf0c09e2642250b8a70263d"}], "title": "crypto: acomp - fix wrong pointer stored by acomp_save_req()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["crypto/acompress.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "343a5bf68a8ff9affcf2b70677ea4cf40c195ee4", "status": "affected", "version": "64929fe8c0a43508eee952cf57903a61c52601e7", "versionType": "git"}, {"lessThan": "1a2785e5985627f2265ba7775949601a29ba0d1e", "status": "affected", "version": "64929fe8c0a43508eee952cf57903a61c52601e7", "versionType": "git"}, {"lessThan": "d7e20b9bd6c990773cf0c09e2642250b8a70263d", "status": "affected", "version": "64929fe8c0a43508eee952cf57903a61c52601e7", "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": "6.18.27", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "24BD5AA7-843C-41A3-8471-F53AD6DB7C6B", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - fix wrong pointer stored by acomp_save_req()\n\nacomp_save_req() stores &req->chain in req->base.data. When\nacomp_reqchain_done() is invoked on asynchronous completion, it receives\n&req->chain as the data argument but casts it directly to struct\nacomp_req. Since data points to the chain member, all subsequent field\naccesses are at a wrong offset, resulting in memory corruption.\n\nThe issue occurs when an asynchronous hardware implementation, such as\nthe QAT driver, completes a request that uses the DMA virtual address\ninterface (e.g. acomp_request_set_src_dma()). This combination causes\ncrypto_acomp_compress() to enter the acomp_do_req_chain() path, which\nsets acomp_reqchain_done() as the completion callback via\nacomp_save_req().\n\nWith KASAN enabled, this manifests as a general protection fault in\nacomp_reqchain_done():\n\n general protection fault, probably for non-canonical address 0xe000040000000000\n KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007]\n RIP: 0010:acomp_reqchain_done+0x15b/0x4e0\n Call Trace:\n <IRQ>\n qat_comp_alg_callback+0x5d/0xa0 [intel_qat]\n adf_ring_response_handler+0x376/0x8b0 [intel_qat]\n adf_response_handler+0x60/0x170 [intel_qat]\n tasklet_action_common+0x223/0x820\n handle_softirqs+0x1ab/0x640\n </IRQ>\n\nFix this by storing the request itself in req->base.data instead of\n&req->chain, so that acomp_reqchain_done() receives the correct pointer.\nSimplify acomp_restore_req() accordingly to access req->chain directly."}], "id": "CVE-2026-46081", "lastModified": "2026-06-24T17:20:20.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-27T14:17:29.510", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a2785e5985627f2265ba7775949601a29ba0d1e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7e20b9bd6c990773cf0c09e2642250b8a70263d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: crypto: acomp - fix wrong pointer stored by acomp_save_req()", "id": "2482135", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482135"}, "csaw": false, "cwe": "CWE-843", "details": ["A flaw was found in the Linux kernel's asynchronous compression (`acomp`) subsystem. When an asynchronous hardware implementation, such as the QAT driver, completes a request that uses the DMA virtual address interface, an incorrect pointer is stored. This leads to memory corruption within the `acomp_reqchain_done()` function, which can result in a denial of service (DoS) due to a general protection fault."], "name": "CVE-2026-46081", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46081\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46081\nhttps://lore.kernel.org/linux-cve-announce/2026052700-CVE-2026-46081-dd38@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64929fe8c0a43508eee952cf57903a61c52601e7,343a5bf68a8ff9affcf2b70677ea4cf40c195ee4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64929fe8c0a43508eee952cf57903a61c52601e7,1a2785e5985627f2265ba7775949601a29ba0d1e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64929fe8c0a43508eee952cf57903a61c52601e7,d7e20b9bd6c990773cf0c09e2642250b8a70263d)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.27,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-27T18:15:21.492017+00:00", "updated": "2026-08-13T23:15:12.602311+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}