ceph: add a bunch of missing ceph_path_info initializers
In the Linux kernel, the following vulnerability has been resolved: ceph: add a bunch of missing ceph_path_info initializers ceph_mdsc_build_path() must be called with a zero-initialized ceph_path_info parameter, or else the following ceph_mdsc_free_path_info() may crash. Example crash (on Linux 6.18.12): virt_to_cache: Object is not a Slab page! WARNING: CPU: 184 PID: 2871736 at mm/slub.c:6732 kmem_cache_free+0x316/0x400 [...] Call Trace: [...] ceph_open+0x13d/0x3e0 do_dentry_open+0x134/0x480 vfs_open+0x2a/0xe0 path_openat+0x9a3/0x1160 [...] cache_from_obj: Wrong slab cache. names_cache but object is from ceph_inode_info WARNING: CPU: 184 PID: 2871736 at mm/slub.c:6746 kmem_cache_free+0x2dd/0x400 [...] kernel BUG at mm/slub.c:634! Oops: invalid opcode: 0000 [#1] SMP NOPTI RIP: 0010:__slab_free+0x1a4/0x350 Some of the ceph_mdsc_build_path() callers had initializers, but others had not, even though they were all added by commit 15f519e9f883 ("ceph: fix race condition validating r_parent before applying state"). The ones without initializer are suspectible to random crashes. (I can imagine it could even be possible to exploit this bug to elevate privileges.) Unfortunately, these Ceph functions are undocumented and its semantics can only be derived from the code. I see that ceph_mdsc_build_path() initializes the structure only on success, but not on error. Calling ceph_mdsc_free_path_info() after a failed ceph_mdsc_build_path() call does not even make sense, but that's what all
CVE-2026-43408
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43408
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "db378e6f83ec705c6091c65d482d555edc2b0a72",
"lessThan": "644b47f0574fd82aeb9d00317eca8d1f2a525c8c",
"versionType": "git"
},
{
"status": "affected",
"version": "15f519e9f883b316d86e2bb6b767a023aafd9d83",
"lessThan": "8be8911f590813e6f90bc6407ced1b23e50bc5da",
"versionType": "git"
},
{
"status": "affected",
"version": "15f519e9f883b316d86e2bb6b767a023aafd9d83",
"lessThan": "453df1f4535842bf17ff1885a225e153d7ee3374",
"versionType": "git"
},
{
"status": "affected",
"version": "15f519e9f883b316d86e2bb6b767a023aafd9d83",
"lessThan": "43323a5934b660afae687e8e4e95ac328615a5c4",
"versionType": "git"
},
{
"status": "affected",
"version": "dc5aad078abc416dd3d555c50f5308c16ba918a7",
"versionType": "git"
},
{
"status": "affected",
"version": "2bfe45987eb346e299d9f763f9cd05f77011519f",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.48",
"lessThan": "6.12.78",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.160",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.16.8",
"lessThan": "6.17",
"versionType": "semver"
}
],
"programFiles": [
"fs/ceph/debugfs.c",
"fs/ceph/dir.c",
"fs/ceph/file.c",
"fs/ceph/inode.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ceph/debugfs.c",
"fs/ceph/dir.c",
"fs/ceph/file.c",
"fs/ceph/inode.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43408
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46296 · Revision 1
- Added to Heist Feed
- Publisher date