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CVE-2026-53011— net/sched: taprio: fix use-after-free in advance_sched() on schedule switch

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 5.2版本存在安全漏洞，该漏洞源于advance_sched()函数在调度切换时存在释放后重用，可能导致内存损坏。以下版本受到影响：5.2版本。

CVSS 7.8 · High EPSS 0.13% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213< a8fc396519ef4f081bc545e88f61241728bb78d7 affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< 3471874578160a28c171a607fa069f24062634b8 affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< 7256996e1ef553716817f3bfd077c2f3b48b582f affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< eee072fe16c646190d33ae69c9983d8de1562bf8 affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< 1bd286fa3e21200133478ed523cc6a2788baf38a affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< b73235da5dde77ed1264f9767b62c28c9d71fd78 affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< 0e62171df8ed4804d00db088f17eed06468233fa affected
a3d43c0d56f1b94e74963a2fbadfb70126d92213< 105425b1969c5affe532713cfac1c0b320d7ac2b affected
… +10 more rows
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I. Basic Information for CVE-2026-53011

Vulnerability Information
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Vulnerability Title
net/sched: taprio: fix use-after-free in advance_sched() on schedule switch
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: fix use-after-free in advance_sched() on schedule switch In advance_sched(), when should_change_schedules() returns true, switch_schedules() is called to promote the admin schedule to oper. switch_schedules() queues the old oper schedule for RCU freeing via call_rcu(), but 'next' still points into an entry of the old oper schedule. The subsequent 'next->end_time = end_time' and rcu_assign_pointer(q->current_entry, next) are use-after-free. Fix this by selecting 'next' from the new oper schedule immediately after switch_schedules(), and using its pre-calculated end_time. setup_first_end_time() sets the first entry's end_time to base_time + interval when the schedule is installed, so the value is already correct. The deleted 'end_time = sched_base_time(admin)' assignment was also harmful independently: it would overwrite the new first entry's pre-calculated end_time with just base_time.
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 5.2版本存在安全漏洞，该漏洞源于advance_sched()函数在调度切换时存在释放后重用，可能导致内存损坏。以下版本受到影响：5.2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 a3d43c0d56f1b94e74963a2fbadfb70126d92213 ~ a8fc396519ef4f081bc545e88f61241728bb78d7 -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-53011

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III. Intelligence Information for CVE-2026-53011

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Patches & Fixes for CVE-2026-53011 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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