{"id":"DEBIAN-CVE-2024-53222","details":"In the Linux kernel, the following vulnerability has been resolved:  zram: fix NULL pointer in comp_algorithm_show()  LTP reported a NULL pointer dereference as followed:   CPU: 7 UID: 0 PID: 5995 Comm: cat Kdump: loaded Not tainted 6.12.0-rc6+ #3  Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015  pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : __pi_strcmp+0x24/0x140  lr : zcomp_available_show+0x60/0x100 [zram]  sp : ffff800088b93b90  x29: ffff800088b93b90 x28: 0000000000000001 x27: 0000000000400cc0  x26: 0000000000000ffe x25: ffff80007b3e2388 x24: 0000000000000000  x23: ffff80007b3e2390 x22: ffff0004041a9000 x21: ffff80007b3e2900  x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000  x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000  x11: 0000000000000000 x10: ffff80007b3e2900 x9 : ffff80007b3cb280  x8 : 0101010101010101 x7 : 0000000000000000 x6 : 0000000000000000  x5 : 0000000000000040 x4 : 0000000000000000 x3 : 00656c722d6f7a6c  x2 : 0000000000000000 x1 : ffff80007b3e2900 x0 : 0000000000000000  Call trace:   __pi_strcmp+0x24/0x140   comp_algorithm_show+0x40/0x70 [zram]   dev_attr_show+0x28/0x80   sysfs_kf_seq_show+0x90/0x140   kernfs_seq_show+0x34/0x48   seq_read_iter+0x1d4/0x4e8   kernfs_fop_read_iter+0x40/0x58   new_sync_read+0x9c/0x168   vfs_read+0x1a8/0x1f8   ksys_read+0x74/0x108   __arm64_sys_read+0x24/0x38   invoke_syscall+0x50/0x120   el0_svc_common.constprop.0+0xc8/0xf0   do_el0_svc+0x24/0x38   el0_svc+0x38/0x138   el0t_64_sync_handler+0xc0/0xc8   el0t_64_sync+0x188/0x190  The zram-\u003ecomp_algs[ZRAM_PRIMARY_COMP] can be NULL in zram_add() if comp_algorithm_set() has not been called.  User can access the zram device by sysfs after device_add_disk(), so there is a time window to trigger the NULL pointer dereference.  Move it ahead device_add_disk() to make sure when user can access the zram device, it is ready.  comp_algorithm_set() is protected by zram-\u003einit_lock in other places and no such problem.","modified":"2026-09-15T09:03:13.147592587Z","published":"2024-12-27T14:15:30.327Z","upstream":["CVE-2024-53222"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-53222"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53222.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53222.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}