CVE-2022-49562
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use…
- Risk score
- 52/100
- CVSS
- 5.5 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 26 Feb 2025
Open in the live forecast Today's forecast
What to know
- What it is
- In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits Use the recently introduced __try_cmpxchg_user() to update guest PTE A/D bits instead of mapping the PTE into kernel address space. The VM_PFNMAP path is broken as it assumes that vm_pgof…
- Affected
- Linux kernel
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
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-2022-49562: In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use… (CVSS 5.5 · 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: Out-of-bounds write (CWE-787). 365 other warnings in 30 days
- Same product: Earlier Linux kernel warnings. 105 in the last 90 days
Why it is Yellow
- CVSS 5.5 medium
- On your watchlist: linux kernel
- Named in a government or vendor bulletin
Government and vendor bulletins
References
- https://ubuntu.com/security/notices/USN-8961-1
- https://ubuntu.com/security/notices/USN-8963-1
- https://ubuntu.com/security/notices/USN-8962-1
- https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78
- https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0
- https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c
Original description
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits Use the recently introduced __try_cmpxchg_user() to update guest PTE A/D bits instead of mapping the PTE into kernel address space. The VM_PFNMAP path is broken as it assumes that vm_pgoff is the base pfn of the mapped VMA range, which is conceptually wrong as vm_pgoff is the offset relative to the file and has nothing to do with the pfn. The horrific hack worked for the original use case (backing guest memory with /dev/mem), but leads to accessing "random" pfns for pretty much any other VM_PFNMAP case.
Last activity 3 Nov 2026. Patch Forecast updates every hour.