{"id":"CVE-2026-23201","state":"PUBLISHED","title":"ceph: fix oops due to invalid pointer for kfree() in parse_longname()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix oops due to invalid pointer for kfree() in parse_longname()\n\nThis fixes a kernel oops when reading ceph snapshot directories (.snap),\nfor example by simply running `ls /mnt/my_ceph/.snap`.\n\nThe variable str is guarded by __free(kfree), but advanced by one for\nskipping the initial '_' in snapshot names. Thus, kfree() is called\nwith an invalid pointer.  This patch removes the need for advancing the\npointer so kfree() is called with correct memory pointer.\n\nSteps to reproduce:\n\n1. Create snapshots on a cephfs volume (I've 63 snaps in my testcase)\n\n2. Add cephfs mount to fstab\n$ echo \"samba-fileserver@.files=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6      /mnt/test/stuff   ceph     acl,noatime,_netdev    0       0\" >> /etc/fstab\n\n3. Reboot the system\n$ systemctl reboot\n\n4. Check if it's really mounted\n$ mount | grep stuff\n\n5. List snapshots (expected 63 snapshots on my system)\n$ ls /mnt/test/stuff/.snap\n\nNow ls hangs forever and the kernel log shows the oops.","publishedAt":"2026-02-14T16:27:25.693Z","updatedAt":"2026-09-14T11:58:12.875Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4b9aee707c4580511983a0998547f3b28514e6a6","status":"affected","lessThan":"c9a129c82ddf82a50b4f8960d2609714ca2dbd26","versionType":"git"},{"version":"bb80f7618832d26f7e395f52f82b1dac76223e5f","status":"affected","lessThan":"8c9af7339de419819cfc641d551675d38ff99abf","versionType":"git"},{"version":"101841c38346f4ca41dc1802c867da990ffb32eb","status":"affected","lessThan":"e258ed369c9e04caa7d2fd49785d753ae4034cb6","versionType":"git"},{"version":"101841c38346f4ca41dc1802c867da990ffb32eb","status":"affected","lessThan":"bc8dedae022ce3058659c3addef3ec4b41d15e00","versionType":"git"},{"version":"3145b2b11492d61c512bbc59660bb823bc757f48","status":"affected","versionType":"git"},{"version":"493479af8af3ab907f49e99323777d498a4fbd2b","status":"affected","versionType":"git"},{"version":"6.12.42","status":"affected","lessThan":"6.12.70","versionType":"semver"},{"version":"6.15.10","status":"affected","lessThan":"6.16","versionType":"semver"},{"version":"6.16.1","status":"affected","lessThan":"6.17","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ceph/crypto.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.12.70","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ceph/crypto.c"]}],"references":["https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26","https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abf","https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6","https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23201.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23201","state":"PUBLISHED","datePublished":"2026-02-14T16:27:25.693Z","dateUpdated":"2026-09-14T11:58:12.875Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.986Z"},"containers":{"cna":{"title":"ceph: fix oops due to invalid pointer for kfree() in parse_longname()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix oops due to invalid pointer for kfree() in parse_longname()\n\nThis fixes a kernel oops when reading ceph snapshot directories (.snap),\nfor example by simply running `ls /mnt/my_ceph/.snap`.\n\nThe variable str is guarded by __free(kfree), but advanced by one for\nskipping the initial '_' in snapshot names. Thus, kfree() is called\nwith an invalid pointer.  This patch removes the need for advancing the\npointer so kfree() is called with correct memory pointer.\n\nSteps to reproduce:\n\n1. Create snapshots on a cephfs volume (I've 63 snaps in my testcase)\n\n2. Add cephfs mount to fstab\n$ echo \"samba-fileserver@.files=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6      /mnt/test/stuff   ceph     acl,noatime,_netdev    0       0\" >> /etc/fstab\n\n3. Reboot the system\n$ systemctl reboot\n\n4. Check if it's really mounted\n$ mount | grep stuff\n\n5. List snapshots (expected 63 snapshots on my system)\n$ ls /mnt/test/stuff/.snap\n\nNow ls hangs forever and the kernel log shows the oops."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4b9aee707c4580511983a0998547f3b28514e6a6","status":"affected","lessThan":"c9a129c82ddf82a50b4f8960d2609714ca2dbd26","versionType":"git"},{"version":"bb80f7618832d26f7e395f52f82b1dac76223e5f","status":"affected","lessThan":"8c9af7339de419819cfc641d551675d38ff99abf","versionType":"git"},{"version":"101841c38346f4ca41dc1802c867da990ffb32eb","status":"affected","lessThan":"e258ed369c9e04caa7d2fd49785d753ae4034cb6","versionType":"git"},{"version":"101841c38346f4ca41dc1802c867da990ffb32eb","status":"affected","lessThan":"bc8dedae022ce3058659c3addef3ec4b41d15e00","versionType":"git"},{"version":"3145b2b11492d61c512bbc59660bb823bc757f48","status":"affected","versionType":"git"},{"version":"493479af8af3ab907f49e99323777d498a4fbd2b","status":"affected","versionType":"git"},{"version":"6.12.42","status":"affected","lessThan":"6.12.70","versionType":"semver"},{"version":"6.15.10","status":"affected","lessThan":"6.16","versionType":"semver"},{"version":"6.16.1","status":"affected","lessThan":"6.17","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ceph/crypto.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.12.70","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ceph/crypto.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26"},{"url":"https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abf"},{"url":"https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6"},{"url":"https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-14T11:58:12.875Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.42","versionEndExcluding":"6.12.70"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.18.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}