high CVSS 7.8

CVE-2024-49895·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix index out of bounds in DCN30 degamma hardware format translation This commit addresses a potential index out of bounds issue in the `cm3_helper_translate_curve_to_degamma_hw_format` function in the DCN30 color management module. The issue could occur when the index 'i' exceeds the number of transfer function points (TRANSFER_FUNC_POINTS). The fix adds a check to ensure 'i' is within bounds before accessing the transfer function points. If 'i' is out of bounds, the function returns false to indicate an error. Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:338 cm3_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.red' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:339 cm3_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.green' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:340 cm3_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.blue' 1025 <= s32max

Severity
high
Software
Kernel
Fixed in
6.11.3
Published
2024-10-21

Affected versions

From: 6.11

Until: 6.11.3

Fixed in: 6.11.3

How to fix this CVE

Update your Linux kernel to version 6.11.3 or later to patch a buffer overflow vulnerability in the AMD display driver's color management module. This flaw could allow local attackers with user-level privileges to trigger a kernel crash or potentially escalate privileges through malformed degamma hardware format operations. Immediate kernel patching is strongly recommended for systems running vulnerable versions 6.11 through 6.11.2.

sudo dnf check-update kernel && sudo dnf update kernel

Defensia detects this vulnerability

How to check if you are affected

  1. Check kernel version: uname -r — vulnerable if output shows 6.11.0, 6.11.1, or 6.11.2
  2. Verify AMD GPU driver presence: lspci | grep -i amd — confirms if DCN30-based AMD display hardware is present
  3. Search kernel logs for degamma errors: sudo dmesg | grep -i 'degamma\|cm3_helper\|buffer overflow' — looks for exploitation attempts
  4. Confirm patched version: uname -r — should show 6.11.3 or later; cross-reference with: cat /proc/version

FAQ

What is CVE-2024-49895?

This vulnerability is a buffer overflow in the AMD display driver's color management (DCN30) module, specifically in the degamma hardware format translation function. An authenticated local attacker can trigger an out-of-bounds memory access by manipulating transfer function point indices, potentially causing a denial of service or privilege escalation.

Is CVE-2024-49895 being actively exploited?

No. This vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, and no public exploits are currently available. However, the local privilege escalation potential warrants prompt patching.

What versions of Kernel are affected by CVE-2024-49895?

Linux kernel versions 6.11.0 through 6.11.2 are vulnerable. The fix is included in kernel 6.11.3 and all later versions.

How do I check if my server is vulnerable to CVE-2024-49895?

Run: uname -r — if the output is 6.11.0, 6.11.1, or 6.11.2, and your system has AMD GPU hardware (check: lspci | grep -i amd), your server is vulnerable.

Does Defensia detect CVE-2024-49895?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel is installed on a monitored server, CVE-2024-49895 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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