CVE-2026-23201

ceph: fix oops due to invalid pointer for kfree() in parse_longname()

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-23201

Published

In the Linux kernel, the following vulnerability has been resolved: ceph: fix oops due to invalid pointer for kfree() in parse_longname() This fixes a kernel oops when reading ceph snapshot directories (.snap), for example by simply running `ls /mnt/my_ceph/.snap`. The variable str is guarded by __free(kfree), but advanced by one for skipping the initial '_' in snapshot names. Thus, kfree() is called with an invalid pointer. This patch removes the need for advancing the pointer so kfree() is called with correct memory pointer. Steps to reproduce: 1. Create snapshots on a cephfs volume (I've 63 snaps in my testcase) 2. Add cephfs mount to fstab $ echo "[email protected]=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6 /mnt/test/stuff ceph acl,noatime,_netdev 0 0" >> /etc/fstab 3. Reboot the system $ systemctl reboot 4. Check if it's really mounted $ mount | grep stuff 5. List snapshots (expected 63 snapshots on my system) $ ls /mnt/test/stuff/.snap Now ls hangs forever and the kernel log shows the oops.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-23201

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/crypto.c"
                    ],
                    "versions": [
                        {
                            "version": "4b9aee707c4580511983a0998547f3b28514e6a6",
                            "lessThan": "c9a129c82ddf82a50b4f8960d2609714ca2dbd26",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bb80f7618832d26f7e395f52f82b1dac76223e5f",
                            "lessThan": "8c9af7339de419819cfc641d551675d38ff99abf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "101841c38346f4ca41dc1802c867da990ffb32eb",
                            "lessThan": "e258ed369c9e04caa7d2fd49785d753ae4034cb6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "101841c38346f4ca41dc1802c867da990ffb32eb",
                            "lessThan": "bc8dedae022ce3058659c3addef3ec4b41d15e00",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3145b2b11492d61c512bbc59660bb823bc757f48",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "493479af8af3ab907f49e99323777d498a4fbd2b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.12.42",
                            "lessThan": "6.12.70",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.15.10",
                            "lessThan": "6.16",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.1",
                            "lessThan": "6.17",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/crypto.c"
                    ],
                    "versions": [
                        {
                            "version": "6.17",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.17",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.70",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.10",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON