CVE-2026-52958
libceph: Fix potential out-of-bounds access in osdmap_decode()
Description
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in osdmap_decode() When decoding osd_state and osd_weight from an incoming osdmap in osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This can potentially result in an out-of-bounds memory access if the incoming message is corrupted such that the max_osd value exceeds the actual content of the osdmap message. This patch fixes the issue by changing the corresponding part in the ceph_decode_need() check to account for map->max_osd*sizeof(*map->osd_weight).
INFO
Published Date :
June 24, 2026, 5:17 p.m.
Last Modified :
July 14, 2026, 4:39 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to include the fix.
- Verify correct decoding of OSD map data.
- Ensure input messages are validated properly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-52958.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-52958 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-52958
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-52958 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-52958 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.3 up to (excluding) 5.10.258 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0d2dd7e6bb74fd7712aa73457a4a821906c6863a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/35d0ed82d03e5ee77ea4f31f20e29562a7721649 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/36a79759a288961b1ff28a68ec2d1f56f6848098 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3f2575bb7f955d42569d96c3e04fa958a0dcf4b4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/48df98d12b15360cd56af5c1f460307b340c1197 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8713bbc4b2b9ad78f803978e54b7e49dd21bd9be Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e7187f33c02488697ec0d01d82bf7a3f8deaba8f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ee933694645dac062d65fc2743f92bc06fa0db6b Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': '36a79759a288961b1ff28a68ec2d1f56f6848098', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': '3f2575bb7f955d42569d96c3e04fa958a0dcf4b4', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': '8713bbc4b2b9ad78f803978e54b7e49dd21bd9be', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': '0d2dd7e6bb74fd7712aa73457a4a821906c6863a', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': 'e7187f33c02488697ec0d01d82bf7a3f8deaba8f', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': '48df98d12b15360cd56af5c1f460307b340c1197', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': 'ee933694645dac062d65fc2743f92bc06fa0db6b', 'versionType': 'git'}, {'status': 'affected', 'version': 'dcbc919a5dc8c2629684a113a90c0b6fe10c3462', 'lessThan': '35d0ed82d03e5ee77ea4f31f20e29562a7721649', 'versionType': 'git'}], 'programFiles': ['net/ceph/osdmap.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ceph/osdmap.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in osdmap_decode() When decoding osd_state and osd_weight from an incoming osdmap in osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This can potentially result in an out-of-bounds memory access if the incoming message is corrupted such that the max_osd value exceeds the actual content of the osdmap message. This patch fixes the issue by changing the corresponding part in the ceph_decode_need() check to account for map->max_osd*sizeof(*map->osd_weight). Added Reference https://git.kernel.org/stable/c/0d2dd7e6bb74fd7712aa73457a4a821906c6863a Added Reference https://git.kernel.org/stable/c/35d0ed82d03e5ee77ea4f31f20e29562a7721649 Added Reference https://git.kernel.org/stable/c/36a79759a288961b1ff28a68ec2d1f56f6848098 Added Reference https://git.kernel.org/stable/c/3f2575bb7f955d42569d96c3e04fa958a0dcf4b4 Added Reference https://git.kernel.org/stable/c/48df98d12b15360cd56af5c1f460307b340c1197 Added Reference https://git.kernel.org/stable/c/8713bbc4b2b9ad78f803978e54b7e49dd21bd9be Added Reference https://git.kernel.org/stable/c/e7187f33c02488697ec0d01d82bf7a3f8deaba8f Added Reference https://git.kernel.org/stable/c/ee933694645dac062d65fc2743f92bc06fa0db6b