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CVE-2021-47125— sch_htb: fix refcount leak in htb_parent_to_leaf_offload

EPSS 0.02% · P4
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I. Basic Information for CVE-2021-47125

Vulnerability Information
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Vulnerability Title
sch_htb: fix refcount leak in htb_parent_to_leaf_offload
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sch_htb: fix refcount leak in htb_parent_to_leaf_offload The commit ae81feb7338c ("sch_htb: fix null pointer dereference on a null new_q") fixes a NULL pointer dereference bug, but it is not correct. Because htb_graft_helper properly handles the case when new_q is NULL, and after the previous patch by skipping this call which creates an inconsistency : dev_queue->qdisc will still point to the old qdisc, but cl->parent->leaf.q will point to the new one (which will be noop_qdisc, because new_q was NULL). The code is based on an assumption that these two pointers are the same, so it can lead to refcount leaks. The correct fix is to add a NULL pointer check to protect qdisc_refcount_inc inside htb_parent_to_leaf_offload.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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 sch_htb 模块的 htb_parent_to_leaf_offload 方法中存在引用计数泄漏。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux ae81feb7338c89cee4e6aa0424bdab2ce2b52da2 ~ 2411c02d03892a5057499f8102d0cc1e0f852416 -
LinuxLinux 5.12 -

II. Public POCs for CVE-2021-47125

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III. Intelligence Information for CVE-2021-47125

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Same Patch Batch · Linux · 2024-03-15 · 26 CVEs total

CVE-2021-47122net: caif: fix memory leak in caif_device_notify
CVE-2021-47135mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report
CVE-2021-47134efi/fdt: fix panic when no valid fdt found
CVE-2021-47133HID: amd_sfh: Fix memory leak in amd_sfh_work
CVE-2021-47132mptcp: fix sk_forward_memory corruption on retransmission
CVE-2021-47131net/tls: Fix use-after-free after the TLS device goes down and up
CVE-2021-47130nvmet: fix freeing unallocated p2pmem
CVE-2021-47129netfilter: nft_ct: skip expectations for confirmed conntrack
CVE-2021-47128bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks
CVE-2021-47127ice: track AF_XDP ZC enabled queues in bitmap
CVE-2021-47126ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions
CVE-2021-47124io_uring: fix link timeout refs
CVE-2021-47123io_uring: fix ltout double free on completion race
CVE-2021-47109neighbour: allow NUD_NOARP entries to be forced GCed
CVE-2021-47121net: caif: fix memory leak in cfusbl_device_notify
CVE-2021-47120HID: magicmouse: fix NULL-deref on disconnect
CVE-2021-47119ext4: fix memory leak in ext4_fill_super
CVE-2021-47118pid: take a reference when initializing `cad_pid`
CVE-2021-47117ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed
CVE-2021-47116ext4: fix memory leak in ext4_mb_init_backend on error path.

Showing top 20 of 26 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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