159 lines
9.0 KiB
JSON
159 lines
9.0 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-2025-40203",
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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": "2025-04-16T07:20:57.179Z",
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"datePublished": "2025-11-12T21:56:34.801Z",
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"dateUpdated": "2026-08-05T12:08:32.046Z"
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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": "2026-08-05T12:08:32.046Z"
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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\nlistmount: don't call path_put() under namespace semaphore\n\nMassage listmount() and make sure we don't call path_put() under the\nnamespace semaphore. If we put the last reference we're fscked."
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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 vulnerability is reached only through the `listmount(2)` system call in fs/namespace.c; there is no remote or adjacent-network path to `do_listmount()`. Exploitation requires the ability to execute syscalls on the target, i.e. local access.\nAC:L - The attacker controls both sides of the race — it holds the extra path reference via `listmount()` while a `CLONE_FS` sibling thread moves `fs->root` off a lazily-unmounted mount, deterministically making the in-syscall `path_put()` the final reference. The setup (unshare, tmpfs mount, chroot, `umount2(MNT_DETACH)`) is scripted and retryable without limit.\nPR:L - `listmount(2)` requires no capability at all for the caller's own mount namespace, and the mount/chroot/lazy-umount setup is obtainable by any unprivileged user via `unshare -Ur` since CAP_SYS_ADMIN/CAP_SYS_CHROOT are granted inside a user namespace. No real root in the init namespace is needed.\nUI:N - The attacking process performs every step itself — namespace creation, mount setup, and the concurrent `listmount()`/`chroot()` race. No victim action or cooperation is involved.\nS:U - The corrupted state (`struct mount`, `struct mountpoint`, `struct dentry`, `namespace_sem`) and the resulting impact all live within the kernel's own security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The final `mntput_no_expire()` tears down mounts, frees `struct mountpoint`, and destroys dentries/inodes while only the read side of `namespace_sem` is held, so concurrent readers (other `listmount()`/`statmount()`/propagation walkers that legitimately hold the read lock and expect a stable topology) can traverse freed objects — a use-after-free giving an attacker-influenceable kernel-memory read primitive via slab reuse.\nI:H - The same violated invariant permits mount-tree list surgery (`list_del(&mnt->mnt_instance)`, `unhash_mnt()`, child reparenting) to race concurrent read-side traversal, yielding linked-list corruption and use-after-free writes into reallocated slab objects, which is exploitable for control-flow hijacking.\nA:H - Performing the final `path_put()` under `namespace_sem` can block or self-deadlock — inode eviction can stall indefinitely on a userspace filesystem daemon, and `__detach_mounts()`'s `down_write(&namespace_sem)` on an already read-held semaphore deadlocks — hanging every mount, umount, statmount, and listmount on the system; the same UAF also reliably oopses the kernel."
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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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"fs/namespace.c"
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],
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"versions": [
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{
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"version": "b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d",
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"lessThan": "659874b7ee4976ad9ce476e07fd36bc67b3537f1",
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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": "b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d",
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"lessThan": "9c80da26fda2fdcaac7f92b5908875b3108830ff",
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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": "b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d",
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"lessThan": "c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0",
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"status": "affected",
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"versionType": "git"
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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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"fs/namespace.c"
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],
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"versions": [
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{
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"version": "6.8",
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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": "6.8",
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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": "6.12.54",
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"lessThanOrEqual": "6.12.*",
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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": "6.17.4",
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"lessThanOrEqual": "6.17.*",
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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",
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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": "6.8",
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"versionEndExcluding": "6.12.54"
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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": "6.8",
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"versionEndExcluding": "6.17.4"
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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": "6.8",
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"versionEndExcluding": "6.18"
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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/659874b7ee4976ad9ce476e07fd36bc67b3537f1"
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},
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{
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"url": "https://git.kernel.org/stable/c/9c80da26fda2fdcaac7f92b5908875b3108830ff"
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},
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{
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"url": "https://git.kernel.org/stable/c/c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0"
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}
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],
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"title": "listmount: don't call path_put() under namespace semaphore",
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