CVE-2026-53160

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A concurrent MEM_UNMAP can free the map\nbetween the lock release and the kref operation, resulting in a\nuse-after-free on the freed slab object.\n\nRestore the take_ref parameter to fastrpc_map_lookup so the reference\nis acquired atomically under fl->lock before the pointer is exposed to\nthe caller."}], "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 vulnerable code is reached through local FastRPC misc-device ioctls such as FASTRPC_IOCTL_MEM_MAP, FASTRPC_IOCTL_INVOKE, and FASTRPC_IOCTL_INIT_CREATE. There is no network or adjacent-path entry point.\nAC:L - The attacker can drive both sides of the race by issuing concurrent map-creating and MEM_UNMAP ioctls against the same FastRPC file context and DMA-buf fd. No condition outside attacker control is required beyond scheduling the race.\nPR:L - The ioctl path has no in-driver capable(), namespace capability, or credential check once the FastRPC device node is open. Exploitation requires local access to the device node as a basic user or device-authorized app, not real root.\nUI:N - No victim action is required after the attacker has local access. The attacker directly opens the FastRPC device and submits ioctls.\nS:U - This is a kernel memory safety bug in a local kernel driver and exploitation would affect the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation by itself.\nC:H - The bug is a use-after-free on struct fastrpc_map, a slab object containing pointers and DMA mapping state. Under the required high-severity rule, this memory corruption is treated as capable of enabling kernel information disclosure.\nI:H - The use-after-free can be raced with allocator reuse and involves refcount/list/DMA mapping state, making control of freed object contents plausibly exploitable for kernel memory corruption. Under the kernel guidance, UAFs receive high integrity impact.\nA:H - Even without full exploitation, racing kref_get_unless_zero() and later map-field use on a freed object can trigger kernel warnings, oopses, or crashes. Repeated local ioctls can therefore cause 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": "0b70ec82b309a4093106ff399da1911ad23b52d3", "lessThan": "0a3b87293fbd34fda651e6aead9964f84b893962", "status": "affected", "versionType": "git"}, {"version": "d7513b47082c08105e837b06cebeb3f07a5fa56f", "lessThan": "8b080c89183196fd3e49212f2a1a1c4a29335b9c", "status": "affected", "versionType": "git"}, {"version": "802359a52676176b18713e33caa17572ad009057", "lessThan": "5b0166112019d1dce30b976ab28fd67f7f0be532", "status": "affected", "versionType": "git"}, {"version": "10df039834f84a297c72ec962c0f9b7c8c5ca31a", "lessThan": "992f121796b7ca83a5a8b93da24e971363206218", "status": "affected", "versionType": "git"}, {"version": "10df039834f84a297c72ec962c0f9b7c8c5ca31a", "lessThan": "f20f6512ecb75c816e0debf4551a138f098615c4", "status": "affected", "versionType": "git"}, {"version": "10df039834f84a297c72ec962c0f9b7c8c5ca31a", "lessThan": "07ebe87915d8accdaba20c4f88c5ae430fe62fbb", "status": "affected", "versionType": "git"}, {"version": "f3f59bab68e9bc714f757ab22f3fb36153014043", "status": "affected", "versionType": "git"}, {"version": "6.1.156", "lessThan": "6.1.176", "status": "affected", "versionType": "semver"}, {"version": "6.6.112", "lessThan": "6.6.143", "status": "affected", "versionType": "semver"}, {"version": "6.12.53", "lessThan": "6.12.94", "status": "affected", "versionType": "semver"}, {"version": "6.17.3", "lessThan": "6.18", "status": "affected", "versionType": "semver"}]}, {"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": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "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": "6.1.156", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.112", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.53", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962"}, {"url": "https://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c"}, {"url": "https://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532"}, {"url": "https://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218"}, {"url": "https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4"}, {"url": "https://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb"}], "title": "misc: fastrpc: fix use-after-free race in fastrpc_map_create", "x_generator": {"engine": "bippy-1.2.0"}}}}

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use-after-free race in fastrpc_map_create\n\nfastrpc_map_lookup returns a raw pointer after releasing fl->lock. The\ncaller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero)\non this unprotected pointer. A concurrent MEM_UNMAP can free the map\nbetween the lock release and the kref operation, resulting in a\nuse-after-free on the freed slab object.\n\nRestore the take_ref parameter to fastrpc_map_lookup so the reference\nis acquired atomically under fl->lock before the pointer is exposed to\nthe caller."}], "id": "CVE-2026-53160", "lastModified": "2026-07-06T16:41:56.237", "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": "2026-06-25T09:16:33.377", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: misc: fastrpc: fix use-after-free race in fastrpc_map_create", "id": "2492839", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492839"}, "csaw": false, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's fastrpc component. A race condition in the `fastrpc_map_create` function allows for a use-after-free vulnerability. This could enable an attacker to cause system instability, disclose sensitive information, or potentially execute unauthorized code."], "name": "CVE-2026-53160", "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": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53160\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53160\nhttps://lore.kernel.org/linux-cve-announce/2026062549-CVE-2026-53160-1531@gregkh/T"]}

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