308 lines
16 KiB
JSON
308 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-26689",
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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": "2024-02-19T14:20:24.154Z",
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"datePublished": "2024-04-03T14:54:50.885Z",
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"dateUpdated": "2026-08-05T11:26:42.116Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:26:42.116Z"
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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\nceph: prevent use-after-free in encode_cap_msg()\n\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."
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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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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:N - The freeing half of the race executes in `handle_cap_grant()`/`ceph_fill_inode()` while parsing `CEPH_MSG_CLIENT_CAPS` messages and reply traces received from the remote Ceph MDS, so a co-tenant CephFS client, a malicious/compromised MDS, or a MITM on the (by-default unencrypted) msgr connection controls the timing and content of the free. The freed buffer's contents are additionally marshalled into `msg->middle` and transmitted back over the network to the MDS.\nAC:L - The attacker drives both sides of the race — local/co-tenant `setxattr` traffic opens the unlocked `__prep_cap()`→`__send_cap()` window, while concurrent access to the same inode from another client forces the MDS to emit the cap grant with a higher `xattr_version` that drops the last reference — and the sequence can be retried without limit until the window is hit.\nPR:L - Exploitation requires only an ordinary unprivileged account with write access to a file on an already-mounted CephFS (no capabilities are checked anywhere on the `setxattr`→`ceph_check_caps`→`__prep_cap` path), or an equally unprivileged co-tenant account on the same shared CephFS.\nUI:N - No victim action is needed at exploit time; the CephFS mount is pre-existing deployment configuration, and the attacker's own syscalls and MDS traffic supply every step of the race.\nS:U - The corruption is confined to kernel heap objects within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free whose stale `vec.iov_base`/`vec.iov_len` are read back and sent to the MDS as the cap message middle section, leaking reallocated kernel heap contents to a remote peer, and heap grooming of the small `kmalloc-64` `ceph_buffer` object generalizes this into an arbitrary kernel-memory read.\nI:H - `ceph_buffer_get()` performs a `kref_get()` increment directly into freed memory, corrupting a refcount field of whatever object is reallocated into that slab slot, and the later `ceph_buffer_put()`/`kvfree()` on stale pointers yields a double-free/arbitrary-free — both standard stepping stones to arbitrary write and control-flow hijack.\nA:H - The use-after-free was caught by KASAN and, unmitigated, corrupts slab metadata and refcounts leading to oops, double-free and kernel panic, which the attacker can trigger repeatedly."
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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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"product": "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/ceph/caps.c"
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"versions": [
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"version": "2.6.34",
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{
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"version": "0",
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"version": "5.10.210",
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