CVE-2022-49840— bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()
Possible ATT&CK Techniques 2AI
T1203 · Exploitation for Client Execution T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 16
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 1cf1cae963c2e6032aebe1637e995bc2f5d330f4< 047824a730699c6c66df43306b80f700c9dfc2fd | affected |
1cf1cae963c2e6032aebe1637e995bc2f5d330f4< 730fb1ef974a13915bc7651364d8b3318891cd70 | affected | ||
1cf1cae963c2e6032aebe1637e995bc2f5d330f4< 7a704dbfd3735304e261f2787c52fbc7c3884736 | affected | ||
1cf1cae963c2e6032aebe1637e995bc2f5d330f4< e60f37a1d379c821c17b08f366412dce9ef3d99f | affected | ||
1cf1cae963c2e6032aebe1637e995bc2f5d330f4< eaa8edd86514afac9deb9bf9a5053e74f37edf40 | affected | ||
1cf1cae963c2e6032aebe1637e995bc2f5d330f4< 1b597f2d6a55e9f549989913860ad5170da04964 | affected | ||
1cf1cae963c2e6032aebe1637e995bc2f5d330f4< d3fd203f36d46aa29600a72d57a1b61af80e4a25 | affected | ||
4.12 | affected | ||
| … +8 more rows | |||
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2022-49840
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb() We got a syzkaller problem because of aarch64 alignment fault if KFENCE enabled. When the size from user bpf program is an odd number, like 399, 407, etc, it will cause the struct skb_shared_info's unaligned access. As seen below: BUG: KFENCE: use-after-free read in __skb_clone+0x23c/0x2a0 net/core/skbuff.c:1032 Use-after-free read at 0xffff6254fffac077 (in kfence-#213): __lse_atomic_add arch/arm64/include/asm/atomic_lse.h:26 [inline] arch_atomic_add arch/arm64/include/asm/atomic.h:28 [inline] arch_atomic_inc include/linux/atomic-arch-fallback.h:270 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline] __skb_clone+0x23c/0x2a0 net/core/skbuff.c:1032 skb_clone+0xf4/0x214 net/core/skbuff.c:1481 ____bpf_clone_redirect net/core/filter.c:2433 [inline] bpf_clone_redirect+0x78/0x1c0 net/core/filter.c:2420 bpf_prog_d3839dd9068ceb51+0x80/0x330 bpf_dispatcher_nop_func include/linux/bpf.h:728 [inline] bpf_test_run+0x3c0/0x6c0 net/bpf/test_run.c:53 bpf_prog_test_run_skb+0x638/0xa7c net/bpf/test_run.c:594 bpf_prog_test_run kernel/bpf/syscall.c:3148 [inline] __do_sys_bpf kernel/bpf/syscall.c:4441 [inline] __se_sys_bpf+0xad0/0x1634 kernel/bpf/syscall.c:4381 kfence-#213: 0xffff6254fffac000-0xffff6254fffac196, size=407, cache=kmalloc-512 allocated by task 15074 on cpu 0 at 1342.585390s: kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:675 [inline] bpf_test_init.isra.0+0xac/0x290 net/bpf/test_run.c:191 bpf_prog_test_run_skb+0x11c/0xa7c net/bpf/test_run.c:512 bpf_prog_test_run kernel/bpf/syscall.c:3148 [inline] __do_sys_bpf kernel/bpf/syscall.c:4441 [inline] __se_sys_bpf+0xad0/0x1634 kernel/bpf/syscall.c:4381 __arm64_sys_bpf+0x50/0x60 kernel/bpf/syscall.c:4381 To fix the problem, we adjust @size so that (@size + @hearoom) is a multiple of SMP_CACHE_BYTES. So we make sure the struct skb_shared_info is aligned to a cache line.
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bpf_prog_test_run_skb中未对齐访问，可能导致越界读取。
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-2022-49840
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2022-49840
请登录查看更多情报信息。
Patches & Fixes for CVE-2022-49840 (7)
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-2025-37778 | 9.8 CRITICAL | ksmbd: Fix dangling pointer in krb_authenticate |
| CVE-2022-49770 | 9.8 CRITICAL | ceph: avoid putting the realm twice when decoding snaps fails |
| CVE-2022-49931 | 8.8 HIGH | IB/hfi1: Correctly move list in sc_disable() |
| 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-2025-37790 | 8.8 HIGH | net: mctp: Set SOCK_RCU_FREE |
| CVE-2022-49910 | 8.8 HIGH | Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu |
| CVE-2022-49886 | 8.4 HIGH | x86/tdx: Panic on bad configs that #VE on "private" memory access |
| 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-2025-37774 | 7.8 HIGH | slab: ensure slab->obj_exts is clear in a newly allocated slab page |
| CVE-2025-37789 | 7.8 HIGH | net: openvswitch: fix nested key length validation in the set() action |
| CVE-2025-37779 | 7.8 HIGH | lib/iov_iter: fix to increase non slab folio refcount |
| CVE-2022-49920 | 7.8 HIGH | netfilter: nf_tables: netlink notifier might race to release objects |
| CVE-2022-49919 | 7.8 HIGH | netfilter: nf_tables: release flow rule object from commit path |
| CVE-2025-37756 | 7.8 HIGH | net: tls: explicitly disallow disconnect |
| CVE-2025-37761 | 7.8 HIGH | drm/xe: Fix an out-of-bounds shift when invalidating TLB |
| CVE-2025-37763 | 7.8 HIGH | drm/imagination: take paired job reference |
| CVE-2025-23141 | 7.8 HIGH | KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses |
Showing top 20 of 245 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
Same vendor: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
V. Comments for CVE-2022-49840
No comments yet