high CVSS 7.1

CVE-2023-52827·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix possible out-of-bound read in ath12k_htt_pull_ppdu_stats() len is extracted from HTT message and could be an unexpected value in case errors happen, so add validation before using to avoid possible out-of-bound read in the following message iteration and parsing. The same issue also applies to ppdu_info->ppdu_stats.common.num_users, so validate it before using too. These are found during code review. Compile test only.

Severity
high
Software
Kernel
Fixed in
6.6.3
Published
2024-05-21

Affected versions

From: 6.6

Until: 6.6.3

Fixed in: 6.6.3

How to fix this CVE

Update your Linux kernel to version 6.6.3 or later to patch an out-of-bounds memory read vulnerability in the ath12k WiFi driver's HTT message parsing code. This vulnerability can occur when malformed or unexpected values are received from the wireless hardware, potentially leading to kernel information disclosure or system instability. Apply the security update as soon as possible to all systems running affected kernel versions.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Check your current kernel version: uname -r — if the output is between 6.6 and 6.6.2, you are vulnerable
  2. Verify ath12k driver is loaded: lsmod | grep ath12k — if present, the affected code path is in use
  3. Review kernel logs for memory access warnings: dmesg | grep -i 'out of bounds\|bounds\|sanitizer' — look for sanitizer-detected violations in HTT processing
  4. After patching, confirm kernel updated: uname -r should show 6.6.3 or later, and reboot if kernel was updated

FAQ

What is CVE-2023-52827?

It is a kernel memory safety vulnerability in the Qualcomm ath12k WiFi driver where insufficient validation of message length and user count fields allows reading memory beyond intended buffer boundaries during packet processing.

Is CVE-2023-52827 being actively exploited?

No, there is no evidence of active exploitation in the wild, and no public exploits are available. However, it should still be patched promptly as a high-severity flaw.

What versions of Kernel are affected by CVE-2023-52827?

Linux kernel versions 6.6 through 6.6.2 are affected. The vulnerability is fixed in kernel 6.6.3 and later.

How do I check if my server is vulnerable to CVE-2023-52827?

Run 'uname -r' and verify your kernel version is between 6.6 and 6.6.2, then check 'lsmod | grep ath12k' to confirm the vulnerable driver is loaded on your system.

Does Defensia detect CVE-2023-52827?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel is installed on a monitored server running versions 6.6 through 6.6.2, CVE-2023-52827 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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CVE-2026-43501CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps the next segment into ipv6_hdr->daddr, recompresses, then pulls the old header and pushes the new one plus the IPv6 header back. The recompressed header can be larger than the received one when the swap reduces the common-prefix length the segments share with daddr (CmprI=0, CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes). pskb_expand_head() was gated on segments_left == 0, so on earlier segments the push consumed unchecked headroom. Once skb_push() leaves fewer than skb->mac_len bytes in front of data, skb_mac_header_rebuild()'s call to: skb_set_mac_header(skb, -skb->mac_len); will store (data - head) - mac_len into the u16 mac_header field, which wraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB past skb->head. A single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two segment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one pass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv. Fix this by expanding the head whenever the remaining room is less than the push size plus mac_len, and request that much extra so the rebuilt MAC header fits afterwards.
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References

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