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CVE-2026-53265— dm cache policy smq: check allocation under invalidate lock

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于竞争条件问题，可能导致队列和哈希表损坏或双重释放。以下版本受到影响：5.10.259之前版本、5.15.210之前版本、6.1.176之前版本和7.0.13之前版本。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 4991b5a08751e2e82488fb93ae08849b6aea10d9< c242c7af2aecf0b538b8623bdb86b8b441da38d9 affected
1b2bec4a7dcf5f00b7a1cbeeec8997841d783513< 13da856c86fb8c2ccab95034fd77da1bb2c2a17c affected
9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e< d886945fcb0f8c9dc6b39928d7a96c95c587346c affected
ac5ee99443891bdb161f5539606a66a1b5e72542< b4892561552d671bd8c4da5ebb70e9fbb1ec446e affected
93627a29d4b66d4a2def938dfb8610cc80ae454b< 03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a affected
c348ae47d8e65f06429fa41adce9ad986b696766< 42ff6774ecd9d7f70d599cb71ff64373a1da4948 affected
2b62d0611c9af14a16bddf22df2612b4f40eb5a1< c57570fba24016ec25ec046ab44db39143fb7a64 affected
2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45< d3f0a606b9f278ece8a0df626ded9c4044071235 affected
… +7 more rows
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I. Basic Information for CVE-2026-53265

Vulnerability Information
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Vulnerability Title
dm cache policy smq: check allocation under invalidate lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: check allocation under invalidate lock commit 2d1f7b65f5de ("dm cache policy smq: fix missing locks in invalidating cache blocks") added mq->lock around the destructive part of smq_invalidate_mapping(), but left the e->allocated check outside the critical section. That leaves a check-then-act race. Two concurrent invalidators can both observe e->allocated as true before either of them takes mq->lock. The first invalidator that acquires the lock removes the entry from the queues and hash table and then calls free_entry(), which clears e->allocated and puts the entry back on the free list. The second invalidator can then acquire mq->lock and continue with the stale result of the unlocked check. This can corrupt the SMQ queues or hash table by deleting an entry that is no longer on those structures. It can also hit the allocation check in free_entry() when the same entry is freed again. Move the allocation check under mq->lock so the predicate and the destructive operations are serialized by the same lock.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于竞争条件问题，可能导致队列和哈希表损坏或双重释放。以下版本受到影响：5.10.259之前版本、5.15.210之前版本、6.1.176之前版本和7.0.13之前版本。
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 4991b5a08751e2e82488fb93ae08849b6aea10d9 ~ c242c7af2aecf0b538b8623bdb86b8b441da38d9 -
Linux Linux 5.10.258 ~ 5.10.259 -

II. Public POCs for CVE-2026-53265

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III. Intelligence Information for CVE-2026-53265

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Patches & Fixes for CVE-2026-53265 (8)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53266 8.8 HIGH netfilter: bridge: make ebt_snat ARP rewrite writable
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53275 8.8 HIGH ipv6: mcast: Fix use-after-free when processing MLD queries
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53265

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