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CVE-2026-80561— libceph: fix multiple unsafe decodes in decode_locker()

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.

在 Linux 内核中，已修复以下漏洞： libceph：修复 decode_locker() 中的多处不安全解码操作 中的 包含三处不安全的解码操作，使得恶意或已受控的 OSD 能够触发 slab 越界读取： 1. 在 的 字段处调用 时，前面缺少边界检查。当 接受 后，若 ，则会读取超出已验证缓冲区边界 9 字节（即 ）。 2. 在读取 头部之后执行的 是一个未检查的指针推进。恶意 OSD 可以将指针 移动到 之后，导致后续所有 检查相对于错误的边界通过。 3. 前面同样缺少边界检查，而紧随其后的 也没有上限控

CVSS 9.8 · Critical EPSS 0.51% · P42

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d4ed4a530562881cc5225050e42d96034f405aae< 1ed45c8d96498725eb54f740172f9068d8673906 affected
d4ed4a530562881cc5225050e42d96034f405aae< 6265103e78f0ee7e2518de9cf938b94bee9700a0 affected
d4ed4a530562881cc5225050e42d96034f405aae< 3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070 affected
d4ed4a530562881cc5225050e42d96034f405aae< fa4aa86fff0c56799c2e3f51a88879053285f4a9 affected
d4ed4a530562881cc5225050e42d96034f405aae< dbfd83f722a78446ec18a476ef7a38e52240b50a affected
d4ed4a530562881cc5225050e42d96034f405aae< d1bba38574d095f191557d397d9633f08cd966b1 affected
d4ed4a530562881cc5225050e42d96034f405aae< 51c8d238fe7236de627ab1a1433694552a904136 affected
d4ed4a530562881cc5225050e42d96034f405aae< 437b6551cfcc235eea1d735a874f9d421f555e17 affected
… +10 more rows
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I. Basic Information for CVE-2026-80561

Vulnerability Information
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Vulnerability Title
libceph: fix multiple unsafe decodes in decode_locker()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: fix multiple unsafe decodes in decode_locker() decode_locker() in cls_lock_client.c contains three unsafe decode operations that allow a malicious or compromised OSD to trigger slab-out-of-bounds reads: 1. ceph_decode_copy() at the locker_id_t name field has no preceding bounds check. With p == end after ceph_start_decoding() accepts struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past the validated buffer boundary. 2. *p += sizeof(struct ceph_timespec) after the locker_info_t header is an unchecked pointer advance. A malicious OSD can position p past end, causing all subsequent _safe checks to pass against a bogus boundary. 3. len = ceph_decode_32(p) has no preceding bounds check, and the immediately following *p += len is uncapped. A malicious OSD can send len=0xffffffff, advancing p gigabytes past end and escaping the decode window entirely. Fix all three by replacing bare operations with their safe variants: ceph_decode_copy -> ceph_decode_copy_safe *p += sizeof(...) -> ceph_decode_skip_n ceph_decode_32(p) -> ceph_decode_32_safe *p += len -> ceph_decode_skip_n A new label is added to return -EINVAL on any bounds violation. -EINVAL is appropriate here: the data received from the OSD is structurally malformed, which is an invalid argument to the decode contract regardless of whether the caller or the wire is at fault. Attacker model: a malicious or compromised OSD in a multi-tenant Ceph deployment can trigger this against any kernel client that issues the lock.get_info class method (e.g. during RBD exclusive lock acquisition) without any further privileges beyond OSD session establishment. [ idryomov: use ceph_decode_skip_string() to skip description, trim changelog ]
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux d4ed4a530562881cc5225050e42d96034f405aae ~ 1ed45c8d96498725eb54f740172f9068d8673906 -
Linux Linux 4.9 -

II. Public POCs for CVE-2026-80561

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III. Intelligence Information for CVE-2026-80561

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Patches & Fixes for CVE-2026-80561 (8)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80561

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