Veille CVE
CVE-2026-52955
9.8 CritiqueDescription
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in crush_decode() A message of type CEPH_MSG_OSD_MAP containing a crush map with at least one bucket has two fields holding the bucket algorithm. If the values in these two fields differ, an out-of-bounds access can occur. This is the case because the first algorithm field (alg) is used to allocate the correct amount of memory for a bucket of this type, while the second algorithm field inside the bucket (b->alg) is used in the subsequent processing. This patch fixes the issue by adding a check that compares alg and b->alg and aborts the processing in case they differ. Furthermore, b->alg is set to 0 in this case, because the destruction of the crush map also uses this field to determine the bucket type, which can again result in an out-of-bounds access when trying to free the memory pointed to by the fields of the bucket. To correctly free the memory allocated for the bucket in such a case, the corresponding call to kfree is moved from the algorithm-specific crush_destroy_bucket functions to the generic crush_destroy_bucket().
Produits concernés
Scores CVSS
| Version | Score | Source | Vecteur |
|---|---|---|---|
| 3.1 | 9.8 Critique | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 4.7 Moyenne | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
Faiblesses (CWE)
Références
- https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d Patch
- https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a Patch
- https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970 Patch
- https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5 Patch
- https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5 Patch
- https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a Patch
- https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622 Patch
- https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa Patch
- https://access.redhat.com/security/cve/CVE-2026-52955 Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2492328 Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json Third Party Advisory