CVE-2022-49921

net: sched: Fix use after free in red_enqueue()

HIGH
7.8
CVSS Score
Published: May 1, 2025 at 02:11 PM UTC
Updated: August 5, 2026 at 09:24 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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").

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≥ 4.4.1634.10 ≤ v < 4.14.2994.15 ≤ v < 4.19.2654.20 ≤ v < 5.4.2244.4.163 ≤ v < 4.54.7 ≤ v < 4.14.2994.7 ≤ v < 4.19.2654.7 ≤ v < 4.9.3334.7 ≤ v < 5.10.1544.7 ≤ v < 5.15.784.7 ≤ v < 5.4.2244.7 ≤ v < 6.0.84.7 ≤ v < 6.15.11 ≤ v < 5.15.785.16 ≤ v < 6.0.85.5 ≤ v < 5.10.1544.4.1636.1 rc16.1 rc26.1 rc3ab0b3b9dbf559a5633d460e748144697bd2d3aa3d7f4f332f082c4d4ba53582f902ed6b44fd6f45e
Vendor states this is fixed in 170e5317042c302777ed6d59fdb84af9b0219d4e (fixed)
Vendor states this is fixed in 52e0429471976785c155bfbf51d80990c6cd46e2 (fixed)
Vendor states this is fixed in 5960b9081baca85cc7dcb14aec1de85999ea9d36 (fixed)
Vendor states this is fixed in 795afe0b9bb6c915f0299a8e309936519be01619 (fixed)
Vendor states this is fixed in 8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9 (fixed)
Vendor states this is fixed in a238cdcf2bdc72207c74375fc8be13ee549ca9db (fixed)
Vendor states this is fixed in e877f8fa49fbccc63cb2df2e9179bddc695b825a (fixed)
Vendor states this is fixed in fc4b50adb400ee5ec527a04073174e8e73a139fa (fixed)
Vendor states this is fixed in 4.14.299 (unaffected)
Vendor states this is fixed in 4.19.265 (unaffected)
Affected range stops below 4.5, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 4.7 (unaffected)
Vendor states this is fixed in 4.9.333 (unaffected)
Vendor states this is fixed in 5.10.154 (unaffected)
Vendor states this is fixed in 5.15.78 (unaffected)
Vendor states this is fixed in 5.4.224 (unaffected)
Vendor states this is fixed in 6.0.8 (unaffected)
Vendor states this is fixed in 6.1 (unaffected)

References (8)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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