high CVSS 7.8

CVE-2024-49986·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: platform/x86: x86-android-tablets: Fix use after free on platform_device_register() errors x86_android_tablet_remove() frees the pdevs[] array, so it should not be used after calling x86_android_tablet_remove(). When platform_device_register() fails, store the pdevs[x] PTR_ERR() value into the local ret variable before calling x86_android_tablet_remove() to avoid using pdevs[] after it has been freed.

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 address a use-after-free vulnerability in the x86-android-tablets platform driver that could lead to kernel memory corruption during device registration failures. Systems running kernel versions 6.11.0 through 6.11.2 should prioritize this update as it fixes improper memory handling that could allow local attackers with elevated privileges to trigger undefined kernel behavior.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check kernel version with 'uname -r' and confirm it is between 6.11.0 and 6.11.2 (vulnerable range)
  2. Step 2: Verify x86-android-tablets driver is compiled in kernel with 'grep CONFIG_X86_ANDROID_TABLETS /boot/config-$(uname -r)' (should show y or m if present)
  3. Step 3: Search kernel logs for platform_device_register failures: 'sudo dmesg | grep -i "platform_device_register\|x86.android" | head -20'
  4. Step 4: After patching, verify new kernel version with 'uname -r' and confirm it shows 6.11.3 or later

FAQ

What is CVE-2024-49986?

CVE-2024-49986 is a use-after-free vulnerability in the Linux kernel's x86-android-tablets platform driver that occurs when device registration fails, allowing freed memory to be accessed and potentially leading to kernel crashes or privilege escalation by local users.

Is CVE-2024-49986 being actively exploited?

No, this vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are currently available, though local privilege escalation techniques could theoretically abuse the memory corruption condition.

What versions of Kernel are affected by CVE-2024-49986?

Linux kernel versions 6.11.0, 6.11.1, and 6.11.2 are affected; kernel 6.11.3 and later contain the fix.

How do I check if my server is vulnerable to CVE-2024-49986?

Run 'uname -r' to check your kernel version; if it shows 6.11.0, 6.11.1, or 6.11.2, your system is vulnerable. Additionally, check if the x86-android-tablets driver is enabled with 'grep CONFIG_X86_ANDROID_TABLETS /boot/config-$(uname -r)'.

Does Defensia detect CVE-2024-49986?

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 6.11.0-6.11.2, CVE-2024-49986 will appear in your dashboard with remediation steps.

Related Kernel CVEs

CVE-2024-42256CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server re-repick on subrequest retry When a subrequest is marked for needing retry, netfs will call cifs_prepare_write() which will make cifs repick the server for the op before renegotiating credits; it then calls cifs_issue_write() which invokes smb2_async_writev() - which re-repicks the server. If a different server is then selected, this causes the increment of server->in_flight to happen against one record and the decrement to happen against another, leading to misaccounting. Fix this by just removing the repick code in smb2_async_writev(). As this is only called from netfslib-driven code, cifs_prepare_write() should always have been called first, and so server should never be NULL and the preparatory step is repeated in the event that we do a retry. The problem manifests as a warning looking something like: WARNING: CPU: 4 PID: 72896 at fs/smb/client/smb2ops.c:97 smb2_add_credits+0x3f0/0x9e0 [cifs] ... RIP: 0010:smb2_add_credits+0x3f0/0x9e0 [cifs] ... smb2_writev_callback+0x334/0x560 [cifs] cifs_demultiplex_thread+0x77a/0x11b0 [cifs] kthread+0x187/0x1d0 ret_from_fork+0x34/0x60 ret_from_fork_asm+0x1a/0x30 Which may be triggered by a number of different xfstests running against an Azure server in multichannel mode. generic/249 seems the most repeatable, but generic/215, generic/249 and generic/308 may also show it.
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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