high CVSS 7.8

CVE-2024-47751·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: PCI: kirin: Fix buffer overflow in kirin_pcie_parse_port() Within kirin_pcie_parse_port(), the pcie->num_slots is compared to pcie->gpio_id_reset size (MAX_PCI_SLOTS) which is correct and would lead to an overflow. Thus, fix condition to pcie->num_slots + 1 >= MAX_PCI_SLOTS and move pcie->num_slots increment below the if-statement to avoid out-of-bounds array access. Found by Linux Verification Center (linuxtesting.org) with SVACE. [kwilczynski: commit log]

Severity
high
Software
Kernel
Fixed in
6.11.2
Published
2024-10-21

Affected versions

From: 6.11

Until: 6.11.2

Fixed in: 6.11.2

How to fix this CVE

Update your Linux kernel to version 6.11.2 or later to resolve a buffer overflow vulnerability in the Kirin PCIe controller initialization. This flaw could allow a local privileged attacker to trigger memory corruption during PCI slot enumeration. Apply the kernel update immediately if you are running affected versions 6.11 through 6.11.1.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your current kernel version with `uname -r` and verify if it falls within 6.11.0 to 6.11.1
  2. Step 2: Determine if your system uses Kirin PCIe hardware by running `lspci | grep -i kirin` or checking `/proc/cpuinfo` for ARM-based Kirin processors
  3. Step 3: Search system logs for PCI enumeration errors with `grep -i 'kirin\|pcie.*parse\|buffer' /var/log/kern.log /var/log/dmesg` to identify exploitation attempts
  4. Step 4: After kernel update, verify the fix with `uname -r` showing version 6.11.2 or higher, then reboot and confirm no PCI errors in dmesg

FAQ

What is CVE-2024-47751?

CVE-2024-47751 is a buffer overflow flaw in the Linux kernel's Kirin PCIe controller driver that occurs during port configuration parsing. An off-by-one error in boundary checking allows writes beyond the allocated gpio_id_reset array bounds when enumerating PCI slots.

Is CVE-2024-47751 being actively exploited?

No, this vulnerability is not listed on the CISA KEV catalog and has no known public exploits at this time. However, it requires local privileged access (PR:L) and should still be patched proactively.

What versions of Kernel are affected by CVE-2024-47751?

Linux kernel versions 6.11.0, 6.11.1, and 6.11.2 (prior to the fix commit) are affected. The vulnerability is resolved in kernel 6.11.2 and later stable releases.

How do I check if my server is vulnerable to CVE-2024-47751?

Run `uname -r` to display your kernel version. If the output is 6.11.0 or 6.11.1 and your hardware includes Kirin PCIe controllers (check with `lspci`), your system is vulnerable.

Does Defensia detect CVE-2024-47751?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Kernel is installed on a monitored server, CVE-2024-47751 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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CVE-2024-36031CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: keys: Fix overwrite of key expiration on instantiation The expiry time of a key is unconditionally overwritten during instantiation, defaulting to turn it permanent. This causes a problem for DNS resolution as the expiration set by user-space is overwritten to TIME64_MAX, disabling further DNS updates. Fix this by restoring the condition that key_set_expiry is only called when the pre-parser sets a specific expiry.
CVE-2024-38612CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: fix invalid unregister error path The error path of seg6_init() is wrong in case CONFIG_IPV6_SEG6_LWTUNNEL is not defined. In that case if seg6_hmac_init() fails, the genl_unregister_family() isn't called. This issue exist since commit 46738b1317e1 ("ipv6: sr: add option to control lwtunnel support"), and commit 5559cea2d5aa ("ipv6: sr: fix possible use-after-free and null-ptr-deref") replaced unregister_pernet_subsys() with genl_unregister_family() in this error path.
CVE-2024-38623CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Use variable length array instead of fixed size Should fix smatch warning: ntfs_set_label() error: __builtin_memcpy() 'uni->name' too small (20 vs 256)
CVE-2021-47548CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() The if statement: if (port >= DSAF_GE_NUM) return; limits the value of port less than DSAF_GE_NUM (i.e., 8). However, if the value of port is 6 or 7, an array overflow could occur: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off; because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6). To fix this possible array overflow, we first check port and if it is greater than or equal to DSAF_MAX_PORT_NUM, the function returns.

References

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