Answer in brief
CVE-2026-52957 records a High severity (CVSS 7.5) vulnerability in libceph: Fix potential null-ptr-deref in decode_choose_args(). The current sources do not mark it as known exploited. The current feed maps 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 7.5. 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). 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:4.13:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.13:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.13:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:4.13:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <301286c0ccd37d66b0e40786fd35a4f19cdbd88a || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <7169f326a23d0f547fcd90e68b72fd387622e126 || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <d7a65a34d2453f8cd3e0cc0e1319740af7e24276 || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <312ec973efac0efb9b9ed64214235910e9ecbaa8 || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <f2f95e6d4b97e70bb876139b0583fc8079983f85 || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c || >=c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 <28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf | d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f, 301286c0ccd37d66b0e40786fd35a4f19cdbd88a, 7169f326a23d0f547fcd90e68b72fd387622e126, d7a65a34d2453f8cd3e0cc0e1319740af7e24276, 312ec973efac0efb9b9ed64214235910e9ecbaa8, f2f95e6d4b97e70bb876139b0583fc8079983f85, a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c, 28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf |
| Linux/Linuxgeneric | 4.13 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential null-ptr-deref in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. When decoding this CRUSH map in crush_decode(), an array of max_buckets CRUSH buckets is decoded, where some indices may not refer to actual buckets and are therefore set to NULL. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). When decoding a crush_choose_arg_map, a series of choose_args for different buckets is decoded, with the bucket_index being read from the incoming message. It is only checked that the bucket index does not exceed max_buckets, but not that it doesn't point to an index with a NULL bucket. If a (potentially corrupted) message contains a crush_choose_arg_map including such a bucket_index, a null pointer dereference may occur in the subsequent processing when attempting to access the bucket with the given index. This patch fixes the issue by extending the affected check. Now, it is only attempted to access the bucket if it is not NULL.
Quoted source text, attributed separately from HOL analysis.