CVE-2025-71116

high

Published 2026-05-20 · Modified 2026-05-28

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: make decode_pool() more resilient against corrupted osdmaps If the osdmap is (maliciously) corrupted such that the encoded length of ceph_pg_pool envelope is less than what is expected for a particular encoding version, out-of-bounds reads may ensue because the only bounds check that is there is based on that length value. This patch adds explicit bounds checks for each field that is decoded or skipped.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API

Description kernel: libceph: make decode_pool() more resilient against corrupted osdmaps Red Hat statement The Ceph client could perform out-of-bounds reads when decoding a corrupted or maliciously crafted osdmap, because the parser trusted length fields without validating each decoded or skipped element. This allows a remote Ceph peer to crash the kernel and cause a denial of service. Although…

Description

kernel: libceph: make decode_pool() more resilient against corrupted osdmaps

Red Hat statement

The Ceph client could perform out-of-bounds reads when decoding a corrupted or maliciously crafted osdmap, because the parser trusted length fields without validating each decoded or skipped element. This allows a remote Ceph peer to crash the kernel and cause a denial of service. Although this issue is triggered over an authenticated Ceph connection, the attack direction is from the server side (OSD/monitor) to the client. Any compromised or malfunctioning Ceph node can provide a malformed osdmap that is parsed in the kernel, breaking Ceph’s security model which assumes that no cluster component should be able to crash or compromise a client, even over an authorized channel.

CVSS v3: 7.1 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H)

Errata / fixed releases

Product	Package	Advisory	Released
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-687.10.1.el9_8`	RHSA-2026:19568	2026-05-20T00:00:00Z
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-687.10.1.el9_8`	RHSA-2026:19568	2026-05-20T00:00:00Z

Package state

Product	Package	State
Red Hat Enterprise Linux 10	`kernel`	Affected
Red Hat Enterprise Linux 6	`kernel`	Not affected
Red Hat Enterprise Linux 7	`kernel`	Affected
Red Hat Enterprise Linux 7	`kernel-rt`	Affected
Red Hat Enterprise Linux 8	`kernel`	Affected
Red Hat Enterprise Linux 8	`kernel-rt`	Affected
Red Hat Enterprise Linux 9	`kernel-rt`	Affected

Apply commands

bash fix

Apply RHSA-2026:19568 for Red Hat Enterprise Linux 9

yum update -y kernel
# or:
dnf upgrade -y kernel

Affected

Vendor	Product	Version
redhat	Red Hat Enterprise Linux 10	`Affected`
redhat	Red Hat Enterprise Linux 6	`Not affected`
redhat	Red Hat Enterprise Linux 7	`Affected`
redhat	Red Hat Enterprise Linux 7	`Affected`
redhat	Red Hat Enterprise Linux 8	`Affected`
redhat	Red Hat Enterprise Linux 8	`Affected`
redhat	Red Hat Enterprise Linux 9	`Affected`

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

AlmaLinux Fixed 1 release

Version	Status	Fixed in
8	Fixed	`kernel-doc-4.18.0-553.126.1.el8_10.noarch.rpm`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`6.12.69-1`
sid	Fixed	`6.18.3-1`
forky	Fixed	`6.18.3-1`
bullseye	Fixed	`5.10.249-1`
bookworm	Fixed	`6.1.162-1`

Red Hat Fixed 2 releases

Version	Status	Fixed in
9	Fixed	—
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.