{"id":"CVE-2025-38203","summary":"jfs: Fix null-ptr-deref in jfs_ioc_trim","details":"In the Linux kernel, the following vulnerability has been resolved:\n\njfs: Fix null-ptr-deref in jfs_ioc_trim\n\n[ Syzkaller Report ]\n\nOops: general protection fault, probably for non-canonical address\n0xdffffc0000000087: 0000 [#1\nKASAN: null-ptr-deref in range [0x0000000000000438-0x000000000000043f]\nCPU: 2 UID: 0 PID: 10614 Comm: syz-executor.0 Not tainted\n6.13.0-rc6-gfbfd64d25c7a-dirty #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nSched_ext: serialise (enabled+all), task: runnable_at=-30ms\nRIP: 0010:jfs_ioc_trim+0x34b/0x8f0\nCode: e7 e8 59 a4 87 fe 4d 8b 24 24 4d 8d bc 24 38 04 00 00 48 8d 93\n90 82 fe ff 4c 89 ff 31 f6\nRSP: 0018:ffffc900055f7cd0 EFLAGS: 00010206\nRAX: 0000000000000087 RBX: 00005866a9e67ff8 RCX: 000000000000000a\nRDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001\nRBP: dffffc0000000000 R08: ffff88807c180003 R09: 1ffff1100f830000\nR10: dffffc0000000000 R11: ffffed100f830001 R12: 0000000000000000\nR13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000438\nFS:  00007fe520225640(0000) GS:ffff8880b7e80000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005593c91b2c88 CR3: 000000014927c000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\u003cTASK\u003e\n? __die_body+0x61/0xb0\n? die_addr+0xb1/0xe0\n? exc_general_protection+0x333/0x510\n? asm_exc_general_protection+0x26/0x30\n? jfs_ioc_trim+0x34b/0x8f0\njfs_ioctl+0x3c8/0x4f0\n? __pfx_jfs_ioctl+0x10/0x10\n? __pfx_jfs_ioctl+0x10/0x10\n__se_sys_ioctl+0x269/0x350\n? __pfx___se_sys_ioctl+0x10/0x10\n? do_syscall_64+0xfb/0x210\ndo_syscall_64+0xee/0x210\n? syscall_exit_to_user_mode+0x1e0/0x330\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fe51f4903ad\nCode: c3 e8 a7 2b 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89 f8 48\n89 f7 48 89 d6 48 89 ca 4d\nRSP: 002b:00007fe5202250c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007fe51f5cbf80 RCX: 00007fe51f4903ad\nRDX: 0000000020000680 RSI: 00000000c0185879 RDI: 0000000000000005\nRBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007fe520225640\nR13: 000000000000000e R14: 00007fe51f44fca0 R15: 00007fe52021d000\n\u003c/TASK\u003e\nModules linked in:\n---[ end trace 0000000000000000 ]---\nRIP: 0010:jfs_ioc_trim+0x34b/0x8f0\nCode: e7 e8 59 a4 87 fe 4d 8b 24 24 4d 8d bc 24 38 04 00 00 48 8d 93\n90 82 fe ff 4c 89 ff 31 f6\nRSP: 0018:ffffc900055f7cd0 EFLAGS: 00010206\nRAX: 0000000000000087 RBX: 00005866a9e67ff8 RCX: 000000000000000a\nRDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001\nRBP: dffffc0000000000 R08: ffff88807c180003 R09: 1ffff1100f830000\nR10: dffffc0000000000 R11: ffffed100f830001 R12: 0000000000000000\nR13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000438\nFS:  00007fe520225640(0000) GS:ffff8880b7e80000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005593c91b2c88 CR3: 000000014927c000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nKernel panic - not syncing: Fatal exception\n\n[ Analysis ]\n\nWe believe that we have found a concurrency bug in the `fs/jfs` module\nthat results in a null pointer dereference. There is a closely related\nissue which has been fixed:\n\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6c1b3599b2feb5c7291f5ac3a36e5fa7cedb234\n\n... but, unfortunately, the accepted patch appears to still be\nsusceptible to a null pointer dereference under some interleavings.\n\nTo trigger the bug, we think that `JFS_SBI(ipbmap-\u003ei_sb)-\u003ebmap` is set\nto NULL in `dbFreeBits` and then dereferenced in `jfs_ioc_trim`. This\nbug manifests quite rarely under normal circumstances, but is\ntriggereable from a syz-program.","modified":"2026-04-02T12:47:52.310183Z","published":"2025-07-04T13:37:23.975Z","related":["CGA-pmqq-qh42-j7wg","SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38203.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d50231d473f89024158dc62624930de45d13718"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4a8cb9908b51500a76f5156423bd295df53bff89"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9806ae34d7d661c372247cd36f83bfa0523d60ed"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4685408ff6c3e2af366ad9a7274f45ff3f394ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9d41c925069c950e18160e12a7e10e0f58c56fb"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38203.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38203"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b40c2e665cd552eae5fbdbb878bc29a34357668e"},{"fixed":"0d50231d473f89024158dc62624930de45d13718"},{"fixed":"a9d41c925069c950e18160e12a7e10e0f58c56fb"},{"fixed":"4a8cb9908b51500a76f5156423bd295df53bff89"},{"fixed":"9806ae34d7d661c372247cd36f83bfa0523d60ed"},{"fixed":"a4685408ff6c3e2af366ad9a7274f45ff3f394ee"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38203.json"}}],"schema_version":"1.7.5"}