CVE-2022-49651

Linux kernel: use-after-free

Risk score: 65/100
CVSS: 7.8 v3.1
Exploit chance (30 days): 0.3%
Published: 26 Feb 2025

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What to know

What it is: A vulnerability in the Linux kernel's srcu module allows for a use-after-free bug, which could be exploited by an attacker with local access to gain high privileges, access data, and impact integrity and availability.
Affected: {'product': 'linux kernel', 'vendor': 'linux'}
Fix: Check the linked advisory for the fix, as the record does not specify a version or detail.
Exploitation: No known exploitation

Story map

Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Linux kernel: Amber, patch this week. In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: restore network header before routing and forwarding ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH) while skb_network_header() points at the IPv6 header. When segments_left > 0, ipv6_srh_rcv() previously restored the …

The flaws

CVE-2022-49651: Use-after-free (CVSS 7.8 · EPSS 0%)
CVE-2026-98096: Out-of-bounds write (CVSS 7.4 · EPSS 1%)
CVE-2026-98115: Race condition (CVSS 8.8 · EPSS 0%)
CVE-2026-98117: Use-after-free (CVSS 7.8 · EPSS 0%)

The fix

Fix: Apply the vendor's security update; see the linked advisory.

Who is exposed: Linux kernel

Where it stands

No known exploitation

How it unfolded

3 Nov, Ubuntu security notices (official): USN-8962-1: Linux kernel (Azure CVM) vulnerabilities
3 Nov, Ubuntu security notices (official): USN-8963-1: Linux kernel (NVIDIA Tegra) vulnerabilities
3 Nov, Ubuntu security notices (official): USN-8961-1: Linux kernel vulnerabilities

Connects to

Same weakness: Use-after-free (CWE-416). 399 other warnings in 30 days
Same product: Earlier Linux kernel warnings. 105 in the last 90 days

Why it is Amber

CVSS 7.8 high
On your watchlist: linux kernel
Named in a government or vendor bulletin

Government and vendor bulletins

References

Original description

In the Linux kernel, the following vulnerability has been resolved: srcu: Tighten cleanup_srcu_struct() GP checks Currently, cleanup_srcu_struct() checks for a grace period in progress, but it does not check for a grace period that has not yet started but which might start at any time. Such a situation could result in a use-after-free bug, so this commit adds a check for a grace period that is needed but not yet started to cleanup_srcu_struct().

Last activity 3 Nov 2026. Patch Forecast updates every hour.