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CVE-2022-49921— net: sched: Fix use after free in red_enqueue()

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red_enqueue使用后释放，可能导致内存损坏。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< 795afe0b9bb6c915f0299a8e309936519be01619 affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< a238cdcf2bdc72207c74375fc8be13ee549ca9db affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< e877f8fa49fbccc63cb2df2e9179bddc695b825a affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< 52e0429471976785c155bfbf51d80990c6cd46e2 affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< 5960b9081baca85cc7dcb14aec1de85999ea9d36 affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< fc4b50adb400ee5ec527a04073174e8e73a139fa affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< 170e5317042c302777ed6d59fdb84af9b0219d4e affected
d7f4f332f082c4d4ba53582f902ed6b44fd6f45e< 8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9 affected
… +12 more rows
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I. Basic Information for CVE-2022-49921

Vulnerability Information
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Vulnerability Title
net: sched: Fix use after free in red_enqueue()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: Fix use after free in red_enqueue() We can't use "skb" again after passing it to qdisc_enqueue(). This is basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb len before calling child enqueue").
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red_enqueue使用后释放，可能导致内存损坏。
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 d7f4f332f082c4d4ba53582f902ed6b44fd6f45e ~ 795afe0b9bb6c915f0299a8e309936519be01619 -
Linux Linux 4.7 -

II. Public POCs for CVE-2022-49921

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III. Intelligence Information for CVE-2022-49921

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Patches & Fixes for CVE-2022-49921 (8)

Same Patch Batch · Linux · 2025-05-01 · 245 CVEs total

CVE-2025-37750 9.8 CRITICAL smb: client: fix UAF in decryption with multichannel
CVE-2025-37778 9.8 CRITICAL ksmbd: Fix dangling pointer in krb_authenticate
CVE-2022-49770 9.8 CRITICAL ceph: avoid putting the realm twice when decoding snaps fails
CVE-2022-49931 8.8 HIGH IB/hfi1: Correctly move list in sc_disable()
CVE-2025-37776 8.8 HIGH ksmbd: fix use-after-free in smb_break_all_levII_oplock()
CVE-2025-37777 8.8 HIGH ksmbd: fix use-after-free in __smb2_lease_break_noti()
CVE-2025-37790 8.8 HIGH net: mctp: Set SOCK_RCU_FREE
CVE-2022-49910 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu
CVE-2022-49886 8.4 HIGH x86/tdx: Panic on bad configs that #VE on "private" memory access
CVE-2025-23159 8.4 HIGH media: venus: hfi: add a check to handle OOB in sfr region
CVE-2025-37749 8.2 HIGH net: ppp: Add bound checking for skb data on ppp_sync_txmung
CVE-2025-37765 7.8 HIGH drm/nouveau: prime: fix ttm_bo_delayed_delete oops
CVE-2022-49905 7.8 HIGH net/smc: Fix possible leaked pernet namespace in smc_init()
CVE-2025-37779 7.8 HIGH lib/iov_iter: fix to increase non slab folio refcount
CVE-2022-49920 7.8 HIGH netfilter: nf_tables: netlink notifier might race to release objects
CVE-2022-49919 7.8 HIGH netfilter: nf_tables: release flow rule object from commit path
CVE-2025-37752 7.8 HIGH net_sched: sch_sfq: move the limit validation
CVE-2025-37756 7.8 HIGH net: tls: explicitly disallow disconnect
CVE-2025-37761 7.8 HIGH drm/xe: Fix an out-of-bounds shift when invalidating TLB
CVE-2025-23141 7.8 HIGH KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses

Showing top 20 of 245 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-49921

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