{"id":"CVE-2023-52770","title":"f2fs: split initial and dynamic conditions for extent_cache","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: split initial and dynamic conditions for extent_cache\n\nLet's allocate the extent_cache tree without dynamic conditions to avoid a\nmissing condition causing a pani…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4377b1d3b19e1369d094a94596211a9815ddbb04 < ff9bc1161cd0209d6f5bee8128a1f078576eea42","Linux >= 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a < 9de787139b0258a5dd1f498780c26d76b61d2958","Linux >= 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a < d83309e7e006cee8afca83523559017c824fbf7a","Linux >= 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a < f803982190f0265fd36cf84670aa6daefc2b0768","Linux >= 6.1.29 < 6.1.191","Linux 6.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-05-21T17:30:42.335957Z"},"published":"2024-05-21","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:17:23.019Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-52770","references":[{"url":"https://git.kernel.org/stable/c/ff9bc1161cd0209d6f5bee8128a1f078576eea42"},{"url":"https://git.kernel.org/stable/c/9de787139b0258a5dd1f498780c26d76b61d2958"},{"url":"https://git.kernel.org/stable/c/d83309e7e006cee8afca83523559017c824fbf7a"},{"url":"https://git.kernel.org/stable/c/f803982190f0265fd36cf84670aa6daefc2b0768"}],"tags":["cve.org"],"epss":0.00236,"epssPercentile":0.14602,"ingestedAt":"2026-11-03T11:43:15.783Z","slug":"CVE-2023-52770","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: split initial and dynamic conditions for extent_cache\n\nLet's allocate the extent_cache tree without dynamic conditions to avoid a\nmissing condition causing a panic as below.\n\n # create a file w/ a compressed flag\n # disable the compression\n # panic while updating extent_cache\n\nF2FS-fs (dm-64): Swapfile: last extent is not aligned to section\nF2FS-fs (dm-64): Swapfile (3) is not align to section: 1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate(2097152 * N)\nAdding 124996k swap on ./swap-file.  Priority:0 extents:2 across:17179494468k\n==================================================================\nBUG: KASAN: null-ptr-deref in instrument_atomic_read_write out/common/include/linux/instrumented.h:101 [inline]\nBUG: KASAN: null-ptr-deref in atomic_try_cmpxchg_acquire out/common/include/asm-generic/atomic-instrumented.h:705 [inline]\nBUG: KASAN: null-ptr-deref in queued_write_lock out/common/include/asm-generic/qrwlock.h:92 [inline]\nBUG: KASAN: null-ptr-deref in __raw_write_lock out/common/include/linux/rwlock_api_smp.h:211 [inline]\nBUG: KASAN: null-ptr-deref in _raw_write_lock+0x5a/0x110 out/common/kernel/locking/spinlock.c:295\nWrite of size 4 at addr 0000000000000030 by task syz-executor154/3327\n\nCPU: 0 PID: 3327 Comm: syz-executor154 Tainted: G           O      5.10.185 #1\nHardware name: emulation qemu-x86/qemu-x86, BIOS 2023.01-21885-gb3cc1cd24d 01/01/2023\nCall Trace:\n __dump_stack out/common/lib/dump_stack.c:77 [inline]\n dump_stack_lvl+0x17e/0x1c4 out/common/lib/dump_stack.c:118\n __kasan_report+0x16c/0x260 out/common/mm/kasan/report.c:415\n kasan_report+0x51/0x70 out/common/mm/kasan/report.c:428\n kasan_check_range+0x2f3/0x340 out/common/mm/kasan/generic.c:186\n __kasan_check_write+0x14/0x20 out/common/mm/kasan/shadow.c:37\n instrument_atomic_read_write out/common/include/linux/instrumented.h:101 [inline]\n atomic_try_cmpxchg_acquire out/common/include/asm-generic/atomic-instrumented.h:705 [inline]\n queued_write_lock out/common/include/asm-generic/qrwlock.h:92 [inline]\n __raw_write_lock out/common/include/linux/rwlock_api_smp.h:211 [inline]\n _raw_write_lock+0x5a/0x110 out/common/kernel/locking/spinlock.c:295\n __drop_extent_tree+0xdf/0x2f0 out/common/fs/f2fs/extent_cache.c:1155\n f2fs_drop_extent_tree+0x17/0x30 out/common/fs/f2fs/extent_cache.c:1172\n f2fs_insert_range out/common/fs/f2fs/file.c:1600 [inline]\n f2fs_fallocate+0x19fd/0x1f40 out/common/fs/f2fs/file.c:1764\n vfs_fallocate+0x514/0x9b0 out/common/fs/open.c:310\n ksys_fallocate out/common/fs/open.c:333 [inline]\n __do_sys_fallocate out/common/fs/open.c:341 [inline]\n __se_sys_fallocate out/common/fs/open.c:339 [inline]\n __x64_sys_fallocate+0xb8/0x100 out/common/fs/open.c:339\n do_syscall_64+0x35/0x50 out/common/arch/x86/entry/common.c:46\n\n## Affected\n\n- `Linux >= 4377b1d3b19e1369d094a94596211a9815ddbb04 < ff9bc1161cd0209d6f5bee8128a1f078576eea42`\n- `Linux >= 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a < 9de787139b0258a5dd1f498780c26d76b61d2958`\n- `Linux >= 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a < d83309e7e006cee8afca83523559017c824fbf7a`\n- `Linux >= 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a < f803982190f0265fd36cf84670aa6daefc2b0768`\n- `Linux >= 6.1.29 < 6.1.191`\n- `Linux 6.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}