CVE-2023-52676

Linux kernel: integer overflow

Risk score: 51/100
CVSS: 5.5 v3.1
Exploit chance (30 days): 0.2%
Published: 17 May 2024

Open in the live forecast Today's forecast

What to know

What it is: In the Linux kernel, the following vulnerability has been resolved: bpf: Guard stack limits against 32bit overflow This patch promotes the arithmetic around checking stack bounds to be done in the 64-bit domain, instead of the current 32bit. The arithmetic implies adding together a 64-bit register with a int offset. T…
Affected: Linux kernel
Fix: Apply the vendor's security update; see the linked advisory.
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-2023-52676: Integer overflow (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: Integer overflow (CWE-190). 158 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

Original description

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard stack limits against 32bit overflow This patch promotes the arithmetic around checking stack bounds to be done in the 64-bit domain, instead of the current 32bit. The arithmetic implies adding together a 64-bit register with a int offset. The register was checked to be below 1<<29 when it was variable, but not when it was fixed. The offset either comes from an instruction (in which case it is 16 bit), from another register (in which case the caller checked it to be below 1<<29 [1]), or from the size of an argument to a kfunc (in which case it can be a u32 [2]). Between the register being inconsistently checked to be below 1<<29, and the offset being up to an u32, it appears that we were open to overflowing the `int`s which were currently used for arithmetic. [1] https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L7494-L7498 [2] https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L11904

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