CVE-2022-49879— ext4: fix BUG_ON() when directory entry has invalid rec_len
Possible ATT&CK Techniques 1AI
T1565.001 · Stored Data ManipulationAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4< 2fa24d0274fbf913b56ee31f15bc01168669d909 | affected |
3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4< 156451a67b93986fb07c274ef6995ff40766c5ad | affected | ||
3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4< 999cff2b6ce3b45c08abf793bf55534777421327 | affected | ||
3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4< ce1ee2c8827fb6493e91acbd50f664cf2a972c3d | affected | ||
3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4< 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 | affected | ||
2.6.30 | affected | ||
< 2.6.30 | unaffected | ||
5.4.224≤ 5.4.* | unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2022-49879
Vulnerability Information
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Vulnerability Title
ext4: fix BUG_ON() when directory entry has invalid rec_len
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix BUG_ON() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: <TASK> ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证目录条目rec_len字段的有效性，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2022-49879
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2022-49879 (5)
Same Patch Batch · Linux · 2025-05-01 · 245 CVEs total
| CVE-2025-37750 | 9.8 CRITICAL | smb: client: fix UAF in decryption with multichannel |
| CVE-2025-37776 | 8.8 HIGH | ksmbd: fix use-after-free in smb_break_all_levII_oplock() |
| CVE-2025-37777 | 8.8 HIGH | ksmbd: fix use-after-free in __smb2_lease_break_noti() |
| CVE-2025-23159 | 8.4 HIGH | media: venus: hfi: add a check to handle OOB in sfr region |
| CVE-2025-37749 | 8.2 HIGH | net: ppp: Add bound checking for skb data on ppp_sync_txmung |
| CVE-2025-23141 | 7.8 HIGH | KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses |
| CVE-2025-37765 | 7.8 HIGH | drm/nouveau: prime: fix ttm_bo_delayed_delete oops |
| CVE-2025-37763 | 7.8 HIGH | drm/imagination: take paired job reference |
| CVE-2025-37756 | 7.8 HIGH | net: tls: explicitly disallow disconnect |
| CVE-2025-37752 | 7.8 HIGH | net_sched: sch_sfq: move the limit validation |
| CVE-2025-37779 | 7.8 HIGH | lib/iov_iter: fix to increase non slab folio refcount |
| CVE-2025-37741 | 7.8 HIGH | jfs: Prevent copying of nlink with value 0 from disk inode |
| CVE-2025-37738 | 7.8 HIGH | ext4: ignore xattrs past end |
| CVE-2025-23158 | 7.8 HIGH | media: venus: hfi: add check to handle incorrect queue size |
| CVE-2025-23157 | 7.8 HIGH | media: venus: hfi_parser: add check to avoid out of bound access |
| CVE-2025-23156 | 7.8 HIGH | media: venus: hfi_parser: refactor hfi packet parsing logic |
| CVE-2025-23151 | 7.8 HIGH | bus: mhi: host: Fix race between unprepare and queue_buf |
| CVE-2025-37789 | 7.8 HIGH | net: openvswitch: fix nested key length validation in the set() action |
| CVE-2025-23150 | 7.8 HIGH | ext4: fix off-by-one error in do_split |
| CVE-2025-23142 | 7.8 HIGH | sctp: detect and prevent references to a freed transport in sendmsg |
Showing top 20 of 245 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
Same vendor: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
V. Comments for CVE-2022-49879
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