{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53388", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.402Z", "datePublished": "2026-07-19T11:59:34.456Z", "dateUpdated": "2026-08-17T04:50:39.284Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:50:39.284Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before replacing page cache folio\n\nfuse_try_move_folio() unlocks the request on entry but does not\nre-lock it on the success path. This means fuse_chan_abort() can end the\nrequest and free the fuse_io_args (eg fuse_readpages_end()) while the\nsubsequent copy chain logic after fuse_try_move_folio() accesses the\nfuse_io_args, leading to use-after-free issues.\n\nFix this by calling lock_request() before replace_page_cache_folio().\nThis ensures the request is locked on the success path which will\nprevent the fuse_io_args from being freed while the later copying logic\nruns, and also ensures that the ap->folios[i]->mapping is never null\nsince ap->folios[i] will always point to the newfolio after\nreplace_page_cache_folio()." } ], "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 bug is reached only through local syscalls: mounting a FUSE filesystem, reading files to trigger readpages, and the FUSE daemon writing replies to /dev/fuse via splice_write with SPLICE_F_MOVE.\nAC:L - The race is between the attacker's own splice reply and a concurrent abort they trigger (e.g., via sysfs abort or unmount); the attacker controls both threads and can retry until the window is hit.\nPR:L - Exploitation requires mounting and operating a FUSE filesystem via /dev/fuse, which needs local user privileges; on typical systems this is reachable by unprivileged users via user namespaces (CAP_SYS_ADMIN in a user namespace) without init-namespace root.\nUI:N - No victim interaction is required; the attacker mounts the filesystem, runs the FUSE daemon, and triggers the concurrent abort themselves.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security domain, not a cross-boundary escape such as guest-to-host or sandbox breakout.\nC:H - The vulnerability is a use-after-free of fuse_io_args and associated folio pointers in kernel heap memory, which can be leveraged for arbitrary kernel memory read via heap reuse.\nI:H - Use-after-free of fuse_io_args enables heap spraying and controlled reuse of freed kernel objects, providing a path to arbitrary kernel memory write or code execution.\nA:H - The UAF and the race with folio replacement can cause kernel oops/panic, including NULL pointer dereference when fuse_readpages_end accesses a folio with a NULL mapping." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/fuse/dev.c" ], "versions": [ { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "7c18691e0cfda29672f79bafde8abdb7710674f6", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "5927b43a4f8d89e86930f524bf63e9c7e66f61b4", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "030fe3e9d8abdee303dd7e9e42f45082d382a407", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "46473ddccdc5065033e397d6e62c280dbcd3d9c2", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "af2892249d982a1c036ca456cc135374e68b6677", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "0223f452532d9cd8a5e87c45de828fd93c99bd25", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "e28db6ac4792d065ab32565fd9f0a2361c3d4666", "status": "affected", "versionType": "git" }, { "version": "ce534fb052928ce556639d7ecf01cbf4e01321e1", "lessThan": "a078484921052d0badd827fcc2770b5cfc1d4120", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/fuse/dev.c" ], "versions": [ { "version": "2.6.35", "status": "affected" }, { "version": "0", "lessThan": "2.6.35", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.211", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.177", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.37", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.14", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.2", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "2.6.35", "versionEndExcluding": "5.15.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.1.177" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.6.144" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.12.95" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.18.37" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.0.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7c18691e0cfda29672f79bafde8abdb7710674f6" }, { "url": "https://git.kernel.org/stable/c/5927b43a4f8d89e86930f524bf63e9c7e66f61b4" }, { "url": "https://git.kernel.org/stable/c/030fe3e9d8abdee303dd7e9e42f45082d382a407" }, { "url": "https://git.kernel.org/stable/c/46473ddccdc5065033e397d6e62c280dbcd3d9c2" }, { "url": "https://git.kernel.org/stable/c/af2892249d982a1c036ca456cc135374e68b6677" }, { "url": "https://git.kernel.org/stable/c/0223f452532d9cd8a5e87c45de828fd93c99bd25" }, { "url": "https://git.kernel.org/stable/c/e28db6ac4792d065ab32565fd9f0a2361c3d4666" }, { "url": "https://git.kernel.org/stable/c/a078484921052d0badd827fcc2770b5cfc1d4120" } ], "title": "fuse: re-lock request before replacing page cache folio", "x_generator": { "engine": "bippy-1.2.0" } } } }