{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-40971", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.603Z", "datePublished": "2024-07-12T12:32:09.440Z", "dateUpdated": "2026-08-05T11:34:19.550Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:34:19.550Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: remove clear SB_INLINECRYPT flag in default_options\n\nIn f2fs_remount, SB_INLINECRYPT flag will be clear and re-set.\nIf create new file or open file during this gap, these files\nwill not use inlinecrypt. Worse case, it may lead to data\ncorruption if wrappedkey_v0 is enable.\n\nThread A: Thread B:\n\n-f2fs_remount\t\t\t\t-f2fs_file_open or f2fs_new_inode\n -default_options\n\t<- clear SB_INLINECRYPT flag\n\n -fscrypt_select_encryption_impl\n\n -parse_options\n\t<- set SB_INLINECRYPT again" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The affected code is reached exclusively through local syscalls — `mount(2)` remount on one side and `open(2)`/`creat(2)`/`mkdir(2)` on the other. No network protocol handler or remote peer data is involved.\nAC:L - There is no tight race to win: whenever the remount option string omits `inlinecrypt`, `SB_INLINECRYPT` stays cleared for the full duration of the remount (which includes multi-second work such as `f2fs_disable_checkpoint()`'s GC loop) or permanently on success, and the attacker simply runs a continuous file-creation loop, which is entirely under their control. f2fs remounts are routine, frequent system operations on the primary deployment (Android `/data`, embedded ro→rw transitions), not an extenuating circumstance.\nPR:L - The exploiting side — opening or creating files on the encrypted f2fs mount so they latch `ci_inlinecrypt = false` — requires only an ordinary unprivileged local account, with no capability check anywhere on the `f2fs_file_open()`/`f2fs_new_inode()` path. Only the environmental remount needs CAP_SYS_ADMIN, and that is a routine system action, not a privilege the attacker must hold.\nUI:N - The attacker performs their own file creations with no action required from another human; the remount is an automated system operation performed by init/vold/systemd during boot, user unlock, or OTA, not an interactive victim step.\nS:U - The mis-selected encryption implementation and the resulting corruption stay within the f2fs superblock and the kernel's own security authority. No VM, IOMMU, container, or sandbox boundary is crossed.\nC:L - The bug silently downgrades file-contents encryption from the inline crypto engine — where, with hardware-wrapped keys, key material never leaves the hardware key slots — to the software crypto API, materializing usable key material in kernel RAM on vendor kernels that permit the fallback and defeating the protection the `inlinecrypt` mount option was chosen to provide. Data is still encrypted on disk, so this is a limited weakening rather than an arbitrary read.\nI:H - Files created or opened while the flag is cleared are permanently bound to the wrong crypto implementation, so with `wrappedkey_v0` their contents are written under a different key than the one used on read-back, producing silent, persistent, unrecoverable corruption of user data on the encrypted partition — exactly the \"data corruption\" the fix commit describes. The corruption survives reboot and is not detectable or repairable by the affected application.\nA:H - On kernels with hardware-wrapped key support, `fscrypt_setup_v2_file_key()` returns `-EINVAL` for every regular-file open when inline crypt was not selected, so the entire encrypted data partition becomes inaccessible for the duration of the window — or indefinitely if the remount omitted `inlinecrypt` — rendering an Android/embedded device unusable. Corrupted system files on `/data` additionally force a factory reset to recover." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/super.c" ], "versions": [ { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "38a82c8d00638bb642bef787eb1d5e0e4d3b7d71", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "724429db09e21ee153fef35e34342279d33df6ae", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "a9cea0489c562c97cd56bb345e78939f9909e7f4", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "eddeb8d941d5be11a9da5637dbe81ac37e8449a2", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "ae39c8ec4250d2a35ddaab1c40faacfec306ff66", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "ac5eecf481c29942eb9a862e758c0c8b68090c33", "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/f2fs/super.c" ], "versions": [ { "version": "3.8", "status": "affected" }, { "version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.221", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.162", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.96", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.36", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.7", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "3.8", "versionEndExcluding": "5.10.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.15.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.1.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.6.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.9.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/38a82c8d00638bb642bef787eb1d5e0e4d3b7d71" }, { "url": "https://git.kernel.org/stable/c/724429db09e21ee153fef35e34342279d33df6ae" }, { "url": "https://git.kernel.org/stable/c/a9cea0489c562c97cd56bb345e78939f9909e7f4" }, { "url": "https://git.kernel.org/stable/c/eddeb8d941d5be11a9da5637dbe81ac37e8449a2" }, { "url": "https://git.kernel.org/stable/c/ae39c8ec4250d2a35ddaab1c40faacfec306ff66" }, { "url": "https://git.kernel.org/stable/c/ac5eecf481c29942eb9a862e758c0c8b68090c33" } ], "title": "f2fs: remove clear SB_INLINECRYPT flag in default_options", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": 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