159 lines
9.4 KiB
JSON
159 lines
9.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-46081",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.096Z",
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"datePublished": "2026-05-27T12:58:19.498Z",
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"dateUpdated": "2026-08-05T12:29:32.090Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:29:32.090Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"crypto/acompress.c"
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],
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"versions": [
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{
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"version": "64929fe8c0a43508eee952cf57903a61c52601e7",
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"lessThan": "343a5bf68a8ff9affcf2b70677ea4cf40c195ee4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "64929fe8c0a43508eee952cf57903a61c52601e7",
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"lessThan": "1a2785e5985627f2265ba7775949601a29ba0d1e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "64929fe8c0a43508eee952cf57903a61c52601e7",
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"lessThan": "d7e20b9bd6c990773cf0c09e2642250b8a70263d",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"crypto/acompress.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.27",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.4",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.27"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.0.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"
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},
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{
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"url": "https://git.kernel.org/stable/c/1a2785e5985627f2265ba7775949601a29ba0d1e"
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},
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{
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"url": "https://git.kernel.org/stable/c/d7e20b9bd6c990773cf0c09e2642250b8a70263d"
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}
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],
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"title": "crypto: acomp - fix wrong pointer stored by acomp_save_req()",
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} |