Answer in brief
CVE-2026-43408 records a High severity (CVSS 7.8) vulnerability in ceph: add a bunch of missing ceph_path_info initializers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=db378e6f83ec705c6091c65d482d555edc2b0a72 <644b47f0574fd82aeb9d00317eca8d1f2a525c8c || >=15f519e9f883b316d86e2bb6b767a023aafd9d83 <8be8911f590813e6f90bc6407ced1b23e50bc5da || >=15f519e9f883b316d86e2bb6b767a023aafd9d83 <453df1f4535842bf17ff1885a225e153d7ee3374 || >=15f519e9f883b316d86e2bb6b767a023aafd9d83 <43323a5934b660afae687e8e4e95ac328615a5c4 || 2bfe45987eb346e299d9f763f9cd05f77011519f || >=6.12.48 <6.12.78 || >=6.16.8 <6.17 | 644b47f0574fd82aeb9d00317eca8d1f2a525c8c, 8be8911f590813e6f90bc6407ced1b23e50bc5da, 453df1f4535842bf17ff1885a225e153d7ee3374, 43323a5934b660afae687e8e4e95ac328615a5c4, 6.12.78, 6.17 |
| Linux/Linuxgeneric | 6.17 | Not reported |
| Linux/Linuxgeneric | >=db378e6f83ec705c6091c65d482d555edc2b0a72 <644b47f0574fd82aeb9d00317eca8d1f2a525c8c || >=15f519e9f883b316d86e2bb6b767a023aafd9d83 <8be8911f590813e6f90bc6407ced1b23e50bc5da || >=15f519e9f883b316d86e2bb6b767a023aafd9d83 <453df1f4535842bf17ff1885a225e153d7ee3374 || >=15f519e9f883b316d86e2bb6b767a023aafd9d83 <43323a5934b660afae687e8e4e95ac328615a5c4 || dc5aad078abc416dd3d555c50f5308c16ba918a7 || 2bfe45987eb346e299d9f763f9cd05f77011519f || >=6.12.48 <6.12.78 || >=6.6.160 <6.7 || >=6.16.8 <6.17 | 644b47f0574fd82aeb9d00317eca8d1f2a525c8c, 8be8911f590813e6f90bc6407ced1b23e50bc5da, 453df1f4535842bf17ff1885a225e153d7ee3374, 43323a5934b660afae687e8e4e95ac328615a5c4, 6.12.78, 6.7, 6.17 |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 callers do, and for it to be safe, the structure must be zero-initialized. The least intrusive approach to fix this is therefore to add initializers everywhere.
Quoted source text, attributed separately from HOL analysis.