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CVE-2025-71080— ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux d2d6422f8bd17c6bb205133e290625a564194496< 1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66 affected
d2d6422f8bd17c6bb205133e290625a564194496< 787515ccb2292f82eb0876993129154629a49651 affected
d2d6422f8bd17c6bb205133e290625a564194496< 1adaea51c61b52e24e7ab38f7d3eba023b2d050d affected
6.12 affected
< 6.12 unaffected
6.12.64≤ 6.12.* unaffected
6.18.4≤ 6.18.* unaffected
6.19≤ * unaffected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux d2d6422f8bd17c6bb205133e290625a564194496 ~ 1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-71080

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III. Intelligence Information for CVE-2025-71080

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Same Patch Batch · Linux · 2026-01-13 · 93 CVEs total

CVE-2025-68811 9.8 CRITICAL svcrdma: use rc_pageoff for memcpy byte offset
CVE-2025-68794 9.8 CRITICAL iomap: adjust read range correctly for non-block-aligned positions
CVE-2025-68817 9.8 CRITICAL ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency
CVE-2025-68775 9.8 CRITICAL net/handshake: duplicate handshake cancellations leak socket
CVE-2025-71068 9.8 CRITICAL svcrdma: bound check rq_pages index in inline path
CVE-2025-68809 9.1 CRITICAL ksmbd: vfs: fix race on m_flags in vfs_cache
CVE-2025-71095 9.1 CRITICAL net: stmmac: fix the crash issue for zero copy XDP_TX action
CVE-2025-71093 9.1 CRITICAL e1000: fix OOB in e1000_tbi_should_accept()
CVE-2025-68818 8.8 HIGH scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path"
CVE-2025-71072 8.2 HIGH shmem: fix recovery on rename failures
CVE-2025-68799 8.1 HIGH caif: fix integer underflow in cffrml_receive()
CVE-2025-68803 8.0 HIGH NFSD: NFSv4 file creation neglects setting ACL
CVE-2025-68808 7.8 HIGH media: vidtv: initialize local pointers upon transfer of memory ownership
CVE-2025-71082 7.8 HIGH Bluetooth: btusb: revert use of devm_kzalloc in btusb
CVE-2025-71092 7.8 HIGH RDMA/bnxt_re: Fix OOB write in bnxt_re_copy_err_stats()
CVE-2025-68792 7.8 HIGH tpm2-sessions: Fix out of range indexing in name_size
CVE-2025-68793 7.8 HIGH drm/amdgpu: fix a job->pasid access race in gpu recovery
CVE-2025-71099 7.8 HIGH drm/xe/oa: Fix potential UAF in xe_oa_add_config_ioctl()
CVE-2025-68805 7.8 HIGH fuse: fix io-uring list corruption for terminated non-committed requests
CVE-2025-68795 7.8 HIGH ethtool: Avoid overflowing userspace buffer on stats query

Showing top 20 of 93 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71080

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