CVE-2025-71080— ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT
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I. Basic Information for CVE-2025-71080
Vulnerability Information
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Vulnerability Title
ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT On PREEMPT_RT kernels, after rt6_get_pcpu_route() returns NULL, the current task can be preempted. Another task running on the same CPU may then execute rt6_make_pcpu_route() and successfully install a pcpu_rt entry. When the first task resumes execution, its cmpxchg() in rt6_make_pcpu_route() will fail because rt6i_pcpu is no longer NULL, triggering the BUG_ON(prev). It's easy to reproduce it by adding mdelay() after rt6_get_pcpu_route(). Using preempt_disable/enable is not appropriate here because ip6_rt_pcpu_alloc() may sleep. Fix this by handling the cmpxchg() failure gracefully on PREEMPT_RT: free our allocation and return the existing pcpu_rt installed by another task. The BUG_ON is replaced by WARN_ON_ONCE for non-PREEMPT_RT kernels where such races should not occur.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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rt6_get_pcpu_route在PREEMPT_RT下存在竞争条件，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-2025-71080
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Same Patch Batch · Linux · 2026-01-13 · 93 CVEs total
| CVE-2025-71089 | 7.8 HIGH | iommu: disable SVA when CONFIG_X86 is set |
| CVE-2025-71067 | ntfs: set dummy blocksize to read boot_block when mounting | |
| CVE-2025-71066 | net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change | |
| CVE-2025-71064 | net: hns3: using the num_tqps in the vf driver to apply for resources | |
| CVE-2025-68820 | ext4: xattr: fix null pointer deref in ext4_raw_inode() | |
| CVE-2025-68819 | media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg() | |
| CVE-2025-68818 | scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path" | |
| CVE-2025-68817 | ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency | |
| CVE-2025-68816 | net/mlx5: fw_tracer, Validate format string parameters | |
| CVE-2025-68821 | fuse: fix readahead reclaim deadlock | |
| CVE-2025-71068 | svcrdma: bound check rq_pages index in inline path | |
| CVE-2025-71069 | f2fs: invalidate dentry cache on failed whiteout creation | |
| CVE-2025-71071 | iommu/mediatek: fix use-after-free on probe deferral | |
| CVE-2025-71070 | ublk: clean up user copy references on ublk server exit | |
| CVE-2025-71072 | shmem: fix recovery on rename failures | |
| CVE-2025-71073 | Input: lkkbd - disable pending work before freeing device | |
| CVE-2025-71074 | functionfs: fix the open/removal races | |
| CVE-2025-71075 | scsi: aic94xx: fix use-after-free in device removal path | |
| CVE-2025-71077 | tpm: Cap the number of PCR banks | |
| CVE-2025-71076 | drm/xe/oa: Limit num_syncs to prevent oversized allocations |
Showing top 20 of 93 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-71080
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