CVE-2026-31730

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Later, fastrpc_rpmsg_remove()\nfrees cctx->remote_heap again if it is non-NULL, which can lead to a\ndouble-free if the INIT_CREATE_STATIC ioctl hits the error path and the rpmsg\ndevice is subsequently removed/unbound.\nClear cctx->remote_heap after freeing it in the error path to prevent the\nlater cleanup from freeing it again.\n\nThis issue was found by an in-house analysis workflow that extracts AST-based\ninformation and runs static checks, with LLM assistance for triage, and was\nconfirmed by manual code review.\nNo hardware testing was performed."}], "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 - FastRPC is reached by a local process opening the fastrpc misc device and issuing FASTRPC_IOCTL_INIT_CREATE_STATIC through the ioctl path. There is no network, adjacent, or physical packet path to this driver entry point.\nAC:L - No race is required; the attacker controls the ioctl arguments and can drive the error path that frees cctx->remote_heap while leaving the stale pointer in the vulnerable code. The stale pointer can then be reached again by retrying the ioctl or during rpmsg teardown, so exploitation does not depend on conditions outside the attacker's practical control.\nPR:L - The driver path has no capable() or namespace privilege check; access is gated only by the fastrpc device node. In reasonable Qualcomm/Android-style deployments these nodes are exposed to untrusted local apps for DSP offload, so a basic unprivileged local user is sufficient.\nUI:N - Once the attacker has local code execution and device-node access, triggering the ioctl path requires no victim action. No user needs to open a file, mount anything, or interact with attacker-controlled content.\nS:U - The vulnerability corrupts kernel-owned memory from within a kernel driver and is scored as a standard local kernel compromise. It does not require crossing a separate security authority such as guest-to-host or IOMMU isolation.\nC:H - The bug leaves a freed fastrpc_buf pointer reachable and later dereferenced/freed again, creating a kernel use-after-free/double-free condition. Per kernel scoring guidance, this kind of memory corruption is treated as capable of high-impact information disclosure.\nI:H - The stale pointer and double-free can corrupt kernel heap/DMA allocation state and may be shaped through heap reuse, making code execution or arbitrary kernel memory modification plausible. Per guidance, UAF/double-free memory corruption warrants high integrity impact.\nA:H - Even without full exploitation, the second dereference/free of an already freed kernel object can cause an oops, panic, or allocator corruption. This is a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/fastrpc.c"], "versions": [{"version": "0871561055e666da421d779397efcc1e5e964cab", "lessThan": "4b8e527aca357a6488680713bd88007cf8f547fe", "status": "affected", "versionType": "git"}, {"version": "0871561055e666da421d779397efcc1e5e964cab", "lessThan": "0bdee4118340c5a756220c1b29a7dab86bb0aa65", "status": "affected", "versionType": "git"}, {"version": "0871561055e666da421d779397efcc1e5e964cab", "lessThan": "3a164f640953cc982804746e772d379171aff5c6", "status": "affected", "versionType": "git"}, {"version": "0871561055e666da421d779397efcc1e5e964cab", "lessThan": "f67d368d26764a357691b2b3a33d3cb55b435bfc", "status": "affected", "versionType": "git"}, {"version": "0871561055e666da421d779397efcc1e5e964cab", "lessThan": "ba2c83167b215da30fa2aae56b140198cf8d8408", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/fastrpc.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.2", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4b8e527aca357a6488680713bd88007cf8f547fe"}, {"url": "https://git.kernel.org/stable/c/0bdee4118340c5a756220c1b29a7dab86bb0aa65"}, {"url": "https://git.kernel.org/stable/c/3a164f640953cc982804746e772d379171aff5c6"}, {"url": "https://git.kernel.org/stable/c/f67d368d26764a357691b2b3a33d3cb55b435bfc"}, {"url": "https://git.kernel.org/stable/c/ba2c83167b215da30fa2aae56b140198cf8d8408"}], "title": "misc: fastrpc: possible double-free of cctx->remote_heap", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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Later, fastrpc_rpmsg_remove()\nfrees cctx->remote_heap again if it is non-NULL, which can lead to a\ndouble-free if the INIT_CREATE_STATIC ioctl hits the error path and the rpmsg\ndevice is subsequently removed/unbound.\nClear cctx->remote_heap after freeing it in the error path to prevent the\nlater cleanup from freeing it again.\n\nThis issue was found by an in-house analysis workflow that extracts AST-based\ninformation and runs static checks, with LLM assistance for triage, and was\nconfirmed by manual code review.\nNo hardware testing was performed."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmisc: fastrpc: posible doble liberaci\u00f3n de cctx -> remote_heap\n\nfastrpc_init_create_static_process() puede liberar cctx -> remote_heap en la ruta err_map pero no borra el puntero. M\u00e1s tarde, fastrpc_rpmsg_remove() libera cctx -> remote_heap de nuevo si no es NULL, lo que puede llevar a una doble liberaci\u00f3n si el ioctl INIT_CREATE_STATIC alcanza la ruta de error y el dispositivo rpmsg es posteriormente eliminado/desvinculado.\nBorrar cctx -> remote_heap despu\u00e9s de liberarlo en la ruta de error para evitar que la limpieza posterior lo libere de nuevo.\n\nEste problema fue encontrado por un flujo de trabajo de an\u00e1lisis interno que extrae informaci\u00f3n basada en AST y ejecuta comprobaciones est\u00e1ticas, con asistencia de LLM para el triaje, y fue confirmado por una revisi\u00f3n manual del c\u00f3digo.\nNo se realizaron pruebas de hardware."}], "id": "CVE-2026-31730", "lastModified": "2026-11-11T21:10:00.200", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:35.577", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bdee4118340c5a756220c1b29a7dab86bb0aa65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a164f640953cc982804746e772d379171aff5c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b8e527aca357a6488680713bd88007cf8f547fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba2c83167b215da30fa2aae56b140198cf8d8408"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f67d368d26764a357691b2b3a33d3cb55b435bfc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: misc: fastrpc: possible double-free of cctx->remote_heap", "id": "2464470", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464470"}, "csaw": false, "cwe": "CWE-1341", "details": ["A flaw was found in the Linux kernel's fastrpc component that could lead to a denial of service (DoS) or potentially arbitrary code execution. This memory corruption vulnerability, specifically a double-free, occurs when the cctx->remote_heap memory is freed twice due to an error handling issue in the fastrpc_init_create_static_process() function. If the INIT_CREATE_STATIC ioctl hits an error path and the rpmsg device is subsequently removed, fastrpc_rpmsg_remove() attempts to free the same memory again."], "name": "CVE-2026-31730", "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31730\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31730\nhttps://lore.kernel.org/linux-cve-announce/2026050136-CVE-2026-31730-ff8a@gregkh/T"]}

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