Answer in brief
CVE-2026-52956 records a High severity (CVSS 7.5) vulnerability in libceph: Fix potential out-of-bounds access in __ceph_x_decrypt(). 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e15fd0a11db00fc7f470a9fc804657ec3f6d04a5 <c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2 || >=e15fd0a11db00fc7f470a9fc804657ec3f6d04a5 <821365487aa58d06bda65c676ba215d506ba9768 || 2982b9c92a66604ffb9fb2db54cf735133d1ef56 || >=4.9.6 <4.10 | c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2, 821365487aa58d06bda65c676ba215d506ba9768, 4.10 |
| Linux/Linuxgeneric | 4.10 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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 out-of-bounds access in __ceph_x_decrypt() In __ceph_x_decrypt(), a part of the buffer p is interpreted as a ceph_x_encrypt_header, and the magic field of this struct is accessed. This happens without any guarantee that the buffer is large enough to hold this struct. The function parameter ciphertext_len represents the length of the ciphertext to decrypt and is guaranteed to be at most the remaining size of the allocated buffer p. However, this value is not necessarily greater than sizeof(ceph_x_encrypt_header). E.g., a message frame of type FRAME_TAG_AUTH_REPLY_MORE, that is just as long to hold the ciphertext at its end with a ciphertext_len of 8 or less, can trigger an out-of-bounds memory access when accessing hdr->magic. This patch fixes the issue by adding a check to ensure that the decrypted plaintext in the buffer is large enough to represent at least the ceph_x_encrypt_header.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-52956 records a High severity (CVSS 7.5) vulnerability in libceph: Fix potential out-of-bounds access in __ceph_x_decrypt(). 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e15fd0a11db00fc7f470a9fc804657ec3f6d04a5 <c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2 || >=e15fd0a11db00fc7f470a9fc804657ec3f6d04a5 <821365487aa58d06bda65c676ba215d506ba9768 || 2982b9c92a66604ffb9fb2db54cf735133d1ef56 || >=4.9.6 <4.10 | c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2, 821365487aa58d06bda65c676ba215d506ba9768, 4.10 |
| Linux/Linuxgeneric | 4.10 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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 out-of-bounds access in __ceph_x_decrypt() In __ceph_x_decrypt(), a part of the buffer p is interpreted as a ceph_x_encrypt_header, and the magic field of this struct is accessed. This happens without any guarantee that the buffer is large enough to hold this struct. The function parameter ciphertext_len represents the length of the ciphertext to decrypt and is guaranteed to be at most the remaining size of the allocated buffer p. However, this value is not necessarily greater than sizeof(ceph_x_encrypt_header). E.g., a message frame of type FRAME_TAG_AUTH_REPLY_MORE, that is just as long to hold the ciphertext at its end with a ciphertext_len of 8 or less, can trigger an out-of-bounds memory access when accessing hdr->magic. This patch fixes the issue by adding a check to ensure that the decrypted plaintext in the buffer is large enough to represent at least the ceph_x_encrypt_header.
Quoted source text, attributed separately from HOL analysis.