{"id":"AZL-55192","summary":"CVE-2024-53222 affecting package kernel for versions less than 6.6.85.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix NULL pointer in comp_algorithm_show()\n\nLTP reported a NULL pointer dereference as followed:\n\n CPU: 7 UID: 0 PID: 5995 Comm: cat Kdump: loaded Not tainted 6.12.0-rc6+ #3\n Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : __pi_strcmp+0x24/0x140\n lr : zcomp_available_show+0x60/0x100 [zram]\n sp : ffff800088b93b90\n x29: ffff800088b93b90 x28: 0000000000000001 x27: 0000000000400cc0\n x26: 0000000000000ffe x25: ffff80007b3e2388 x24: 0000000000000000\n x23: ffff80007b3e2390 x22: ffff0004041a9000 x21: ffff80007b3e2900\n x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000\n x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000\n x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n x11: 0000000000000000 x10: ffff80007b3e2900 x9 : ffff80007b3cb280\n x8 : 0101010101010101 x7 : 0000000000000000 x6 : 0000000000000000\n x5 : 0000000000000040 x4 : 0000000000000000 x3 : 00656c722d6f7a6c\n x2 : 0000000000000000 x1 : ffff80007b3e2900 x0 : 0000000000000000\n Call trace:\n  __pi_strcmp+0x24/0x140\n  comp_algorithm_show+0x40/0x70 [zram]\n  dev_attr_show+0x28/0x80\n  sysfs_kf_seq_show+0x90/0x140\n  kernfs_seq_show+0x34/0x48\n  seq_read_iter+0x1d4/0x4e8\n  kernfs_fop_read_iter+0x40/0x58\n  new_sync_read+0x9c/0x168\n  vfs_read+0x1a8/0x1f8\n  ksys_read+0x74/0x108\n  __arm64_sys_read+0x24/0x38\n  invoke_syscall+0x50/0x120\n  el0_svc_common.constprop.0+0xc8/0xf0\n  do_el0_svc+0x24/0x38\n  el0_svc+0x38/0x138\n  el0t_64_sync_handler+0xc0/0xc8\n  el0t_64_sync+0x188/0x190\n\nThe zram-\u003ecomp_algs[ZRAM_PRIMARY_COMP] can be NULL in zram_add() if\ncomp_algorithm_set() has not been called.  User can access the zram device\nby sysfs after device_add_disk(), so there is a time window to trigger the\nNULL pointer dereference.  Move it ahead device_add_disk() to make sure\nwhen user can access the zram device, it is ready.  comp_algorithm_set()\nis protected by zram-\u003einit_lock in other places and no such problem.","modified":"2026-04-01T05:18:31.780992Z","published":"2024-12-27T14:15:30Z","upstream":["CVE-2024-53222"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53222"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.85.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-55192.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}