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CVE-2025-39880— libceph: fix invalid accesses to ceph_connection_v1_info

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，该漏洞源于未检查con->v1联合成员是否处于活动状态，可能导致无效访问。

CVSS 9.8 · Critical EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1207 · Rogue Domain Controller

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux cd1a677cad994021b19665ed476aea63f5d54f31< ea12ab684f8ae8a6da11a22c78d94a79e2163096 affected
cd1a677cad994021b19665ed476aea63f5d54f31< 591ea9c30737663a471b2bb07b27ddde86b020d5 affected
cd1a677cad994021b19665ed476aea63f5d54f31< 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8 affected
cd1a677cad994021b19665ed476aea63f5d54f31< 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983 affected
cd1a677cad994021b19665ed476aea63f5d54f31< 6bd8b56899be0b514945f639a89ccafb8f8dfaef affected
cd1a677cad994021b19665ed476aea63f5d54f31< cdbc9836c7afadad68f374791738f118263c5371 affected
5.11 affected
< 5.11 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-39880

Vulnerability Information
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Vulnerability Title
libceph: fix invalid accesses to ceph_connection_v1_info
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use). On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and successive fetching of new tickets. con->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that it's being written to can cause more serious consequences, but luckily it's not something that happens often.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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，该漏洞源于未检查con->v1联合成员是否处于活动状态，可能导致无效访问。
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 cd1a677cad994021b19665ed476aea63f5d54f31 ~ ea12ab684f8ae8a6da11a22c78d94a79e2163096 -
Linux Linux 5.11 -

II. Public POCs for CVE-2025-39880

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III. Intelligence Information for CVE-2025-39880

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Patches & Fixes for CVE-2025-39880 (1)

Same Patch Batch · Linux · 2025-09-23 · 21 CVEs total

CVE-2025-39869 8.4 HIGH dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
CVE-2025-39882 8.4 HIGH drm/mediatek: fix potential OF node use-after-free
CVE-2025-39888 7.8 HIGH fuse: Block access to folio overlimit
CVE-2025-39872 7.8 HIGH hsr: hold rcu and dev lock for hsr_get_port_ndev
CVE-2025-39873 7.8 HIGH can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
CVE-2025-39868 7.8 HIGH erofs: fix runtime warning on truncate_folio_batch_exceptionals()
CVE-2025-39881 7.8 HIGH kernfs: Fix UAF in polling when open file is released
CVE-2025-39879 ceph: always call ceph_shift_unused_folios_left()
CVE-2025-39887 tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
CVE-2025-39885 ocfs2: fix recursive semaphore deadlock in fiemap call
CVE-2025-39886 bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
CVE-2025-39883 mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
CVE-2025-39884 btrfs: fix subvolume deletion lockup caused by inodes xarray race
CVE-2025-39878 ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error
CVE-2025-39877 mm/damon/sysfs: fix use-after-free in state_show()
CVE-2025-39876 net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable()
CVE-2025-39874 macsec: sync features on RTM_NEWLINK
CVE-2025-39875 igb: Fix NULL pointer dereference in ethtool loopback test
CVE-2025-39871 dmaengine: idxd: Remove improper idxd_free
CVE-2025-39870 dmaengine: idxd: Fix double free in idxd_setup_wqs()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39880

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