Описание
In the Linux kernel, the following vulnerability has been resolved:
ceph: fix memory leak in ceph_mds_auth_match()
We now free the temporary target path substring allocation on every
possible branch, instead of omitting the default branch. In some
cases, a memory leak occured, which could rapidly crash the system
(depending on how many file accesses were attempted).
This was detected in production because it caused a continuous memory
growth, eventually triggering kernel OOM and completely hard-locking
the kernel.
Relevant kmemleak stacktrace:
unreferenced object 0xffff888131e69900 (size 128):
comm "git", pid 66104, jiffies 4295435999
hex dump (first 32 bytes):
76 6f 6c 75 6d 65 73 2f 63 6f 6e 74 61 69 6e 65 volumes/containe
72 73 2f 67 69 74 65 61 2f 67 69 74 65 61 2f 67 rs/gitea/gitea/g
backtrace (crc 2f3bb450):
[] __kmalloc_noprof+0x359/0x510
[] ceph_mds_check_access+0x5bf/0x14e0 [ceph]
[] ceph_open+0x312/0xd80 [ceph]
[] do_dentry_open+0x456/0x1120
[] vfs_open+0x79/0x360
[] path_openat+0x1de5/0x4390
[] do_filp_open+0x19c/0x3c0
[] do_sys_openat2+0x141/0x180
[] __x64_sys_open+0xe5/0x1a0
[] do_syscall_64+0xb7/0x210
[] entry_SYSCALL_64_after_hwframe+0x77/0x7f
It can be triggered by mouting a subdirectory of a CephFS filesystem,
and then trying to access files on this subdirectory with an auth token
using a path-scoped capability:
$ ceph auth get client.services
[client.services]
key = REDACTED
caps mds = "allow rw fsname=cephfs path=/volumes/"
caps mon = "allow r fsname=cephfs"
caps osd = "allow rw tag cephfs data=cephfs"
$ cat /proc/self/mounts
services@[REDACTED].cephfs=/volumes/containers /ceph/containers ceph rw,noatime,name=services,secret=,ms_mode=prefer-crc,mount_timeout=300,acl,mon_addr=[REDACTED]:3300,recover_session=clean 0 0
$ seq 1 1000000 | xargs -P32 --replace={} touch /ceph/containers/file-{} &&
seq 1 1000000 | xargs -P32 --replace={} cat /ceph/containers/file-{}
[ idryomov: combine if statements, rename rc to path_matched and make
it a bool, formatting ]
Отчет
This vulnerability is rated as Moderate severity because it requires local access to an active CephFS mount configured with path-scoped authorizations, restricting the blast radius to systems utilizing this specific configuration. Although continuous file lookups can exhaust system memory and induce a kernel denial of service, the issue cannot be exploited remotely and does not compromise data confidentiality or integrity. Standard environments that do not mount CephFS subdirectories under path-restricted capability credentials remain unaffected.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Affected | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Out of support scope | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Out of support scope | ||
| Red Hat Enterprise Linux 8 | kernel | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected |
Показывать по
Дополнительная информация
Статус:
EPSS
5.5 Medium
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: ceph: fix memory leak in ceph_mds_auth_match() We now free the temporary target path substring allocation on every possible branch, instead of omitting the default branch. In some cases, a memory leak occured, which could rapidly crash the system (depending on how many file accesses were attempted). This was detected in production because it caused a continuous memory growth, eventually triggering kernel OOM and completely hard-locking the kernel. Relevant kmemleak stacktrace: unreferenced object 0xffff888131e69900 (size 128): comm "git", pid 66104, jiffies 4295435999 hex dump (first 32 bytes): 76 6f 6c 75 6d 65 73 2f 63 6f 6e 74 61 69 6e 65 volumes/containe 72 73 2f 67 69 74 65 61 2f 67 69 74 65 61 2f 67 rs/gitea/gitea/g backtrace (crc 2f3bb450): [<ffffffffaa68fb49>] __kmalloc_noprof+0x359/0x510 [<ffffffffc32bf1df>] ceph_mds_check_access+0x5bf/0x14e0 [ceph] [<ffffffffc3235722>] ceph_open+0x312/0xd80 [ceph] [<fff...
In the Linux kernel, the following vulnerability has been resolved: ceph: fix memory leak in ceph_mds_auth_match() We now free the temporary target path substring allocation on every possible branch, instead of omitting the default branch. In some cases, a memory leak occured, which could rapidly crash the system (depending on how many file accesses were attempted). This was detected in production because it caused a continuous memory growth, eventually triggering kernel OOM and completely hard-locking the kernel. Relevant kmemleak stacktrace: unreferenced object 0xffff888131e69900 (size 128): comm "git", pid 66104, jiffies 4295435999 hex dump (first 32 bytes): 76 6f 6c 75 6d 65 73 2f 63 6f 6e 74 61 69 6e 65 volumes/containe 72 73 2f 67 69 74 65 61 2f 67 69 74 65 61 2f 67 rs/gitea/gitea/g backtrace (crc 2f3bb450): [<ffffffffaa68fb49>] __kmalloc_noprof+0x359/0x510 [<ffffffffc32bf1df>] ceph_mds_check_access+0x5bf/0x14e0 [ceph]
In the Linux kernel, the following vulnerability has been resolved: c ...
In the Linux kernel, the following vulnerability has been resolved: ceph: fix memory leak in ceph_mds_auth_match() We now free the temporary target path substring allocation on every possible branch, instead of omitting the default branch. In some cases, a memory leak occured, which could rapidly crash the system (depending on how many file accesses were attempted). This was detected in production because it caused a continuous memory growth, eventually triggering kernel OOM and completely hard-locking the kernel. Relevant kmemleak stacktrace: unreferenced object 0xffff888131e69900 (size 128): comm "git", pid 66104, jiffies 4295435999 hex dump (first 32 bytes): 76 6f 6c 75 6d 65 73 2f 63 6f 6e 74 61 69 6e 65 volumes/containe 72 73 2f 67 69 74 65 61 2f 67 69 74 65 61 2f 67 rs/gitea/gitea/g backtrace (crc 2f3bb450): [<ffffffffaa68fb49>] __kmalloc_noprof+0x359/0x510 [<ffffffffc32bf1df>] ceph_mds_check_access+0x5bf/0x14e0 [ce...
Уязвимость компонента ceph ядра операционной системы Linux, позволяющая нарушителю вызвать отказ в обслуживании
EPSS
5.5 Medium
CVSS3