CVE-2022-50674— riscv: vdso: fix NULL deference in vdso_join_timens() when vfork
Possible ATT&CK Techniques 1AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 3092eb45637573c5e435fbf5eaf9516316e5f9c6< df30c4feba51beeb138f3518c2421abc8cbda3c1 | affected |
3092eb45637573c5e435fbf5eaf9516316e5f9c6< f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4 | affected | ||
3092eb45637573c5e435fbf5eaf9516316e5f9c6< a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9 | affected | ||
5.19 | affected | ||
< 5.19 | unaffected | ||
5.19.17≤ 5.19.* | unaffected | ||
6.0.3≤ 6.0.* | unaffected | ||
6.1≤ * | unaffected |
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I. Basic Information for CVE-2022-50674
Vulnerability Information
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Vulnerability Title
riscv: vdso: fix NULL deference in vdso_join_timens() when vfork
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: riscv: vdso: fix NULL deference in vdso_join_timens() when vfork Testing tools/testing/selftests/timens/vfork_exec.c got below kernel log: [ 6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020 [ 6.842255] Oops [#1] [ 6.842871] Modules linked in: [ 6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8 [ 6.845861] Hardware name: riscv-virtio,qemu (DT) [ 6.848009] epc : vdso_join_timens+0xd2/0x110 [ 6.850097] ra : vdso_join_timens+0xd2/0x110 [ 6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0 [ 6.852562] gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030 [ 6.853852] t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40 [ 6.854984] s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c [ 6.856221] a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000 [ 6.858114] a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038 [ 6.859484] s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000 [ 6.860751] s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38 [ 6.862029] s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e [ 6.863304] s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f [ 6.864565] t5 : ffffffff80d11130 t6 : ff6000000181fa00 [ 6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause: 000000000000000d [ 6.868046] [<ffffffff8008dc94>] timens_commit+0x38/0x11a [ 6.869089] [<ffffffff8008dde8>] timens_on_fork+0x72/0xb4 [ 6.870055] [<ffffffff80190096>] begin_new_exec+0x3c6/0x9f0 [ 6.871231] [<ffffffff801d826c>] load_elf_binary+0x628/0x1214 [ 6.872304] [<ffffffff8018ee7a>] bprm_execve+0x1f2/0x4e4 [ 6.873243] [<ffffffff8018f90c>] do_execveat_common+0x16e/0x1ee [ 6.874258] [<ffffffff8018f9c8>] sys_execve+0x3c/0x48 [ 6.875162] [<ffffffff80003556>] ret_from_syscall+0x0/0x2 [ 6.877484] ---[ end trace 0000000000000000 ]--- This is because the mm->context.vdso_info is NULL in vfork case. From another side, mm->context.vdso_info either points to vdso info for RV64 or vdso info for compat, there's no need to bloat riscv's mm_context_t, we can handle the difference when setup the additional page for vdso.
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vdso_join_timens中未正确处理用户内存访问，可能导致空指针取消引用。
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-2022-50674
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-12-09 · 152 CVEs total
| CVE-2025-40343 | 9.8 CRITICAL | nvmet-fc: avoid scheduling association deletion twice |
| CVE-2023-53794 | 9.8 CRITICAL | cifs: fix session state check in reconnect to avoid use-after-free issue |
| CVE-2022-50666 | 9.8 CRITICAL | RDMA/siw: Fix QP destroy to wait for all references dropped. |
| CVE-2023-53827 | 8.8 HIGH | Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} |
| CVE-2023-53785 | 8.8 HIGH | mt76: mt7921: don't assume adequate headroom for SDIO headers |
| CVE-2023-53822 | 8.8 HIGH | wifi: ath11k: Ignore frags from uninitialized peer in dp. |
| CVE-2025-40336 | 8.8 HIGH | drm/gpusvm: fix hmm_pfn_to_map_order() usage |
| CVE-2025-40342 | 8.8 HIGH | nvme-fc: use lock accessing port_state and rport state |
| CVE-2025-40328 | 8.8 HIGH | smb: client: fix potential UAF in smb2_close_cached_fid() |
| CVE-2023-53851 | 8.4 HIGH | drm/msm/dp: Drop aux devices together with DP controller |
| CVE-2025-40337 | 8.2 HIGH | net: stmmac: Correctly handle Rx checksum offload errors |
| CVE-2022-50656 | 8.1 HIGH | nfc: pn533: Clear nfc_target before being used |
| CVE-2023-53803 | 8.1 HIGH | scsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process() |
| CVE-2023-53804 | 7.8 HIGH | nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode() |
| CVE-2023-53819 | 7.8 HIGH | amdgpu: validate offset_in_bo of drm_amdgpu_gem_va |
| CVE-2023-53816 | 7.8 HIGH | drm/amdkfd: fix potential kgd_mem UAFs |
| CVE-2023-53800 | 7.8 HIGH | ubi: Fix use-after-free when volume resizing failed |
| CVE-2023-53790 | 7.8 HIGH | bpf: Zeroing allocated object from slab in bpf memory allocator |
| CVE-2023-53795 | 7.8 HIGH | iommufd: IOMMUFD_DESTROY should not increase the refcount |
| CVE-2023-53810 | 7.8 HIGH | blk-mq: release crypto keyslot before reporting I/O complete |
Showing top 20 of 152 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
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