high CVSS 7.8

CVE-2024-26622·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: tomoyo: fix UAF write bug in tomoyo_write_control() Since tomoyo_write_control() updates head->write_buf when write() of long lines is requested, we need to fetch head->write_buf after head->io_sem is held. Otherwise, concurrent write() requests can cause use-after-free-write and double-free problems.

Severity
high
Software
Kernel
Fixed in
6.7.9
Published
2024-03-04

Affected versions

From: 6.7

Until: 6.7.9

Fixed in: 6.7.9

How to fix this CVE

Update your Linux kernel to version 6.7.9 or later to resolve a use-after-free vulnerability in the TOMOYO security module's write control function. This flaw allows local authenticated users to trigger memory corruption through concurrent write operations. Prioritize this patch for systems where unprivileged users have shell access or where TOMOYO MAC is actively enforced.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Run 'uname -r' to check your current kernel version; if it is 6.7.0 through 6.7.8, your system is vulnerable
  2. Verify if TOMOYO is enabled: check 'cat /proc/cmdline' for 'security=tomoyo' or verify with 'cat /sys/kernel/security/lsm'
  3. Review authentication logs for unusual local user activity: 'sudo journalctl -u auth --since '1 week ago'' to identify potential exploitation attempts
  4. Confirm the patch has been applied by re-running 'uname -r' post-kernel-update and verifying the version is 6.7.9 or higher

FAQ

What is CVE-2024-26622?

CVE-2024-26622 is a use-after-free memory corruption vulnerability in the Linux kernel's TOMOYO MAC module that occurs when multiple write() calls modify shared buffers concurrently. An authenticated local attacker can exploit this race condition to corrupt kernel memory and potentially escalate privileges.

Is CVE-2024-26622 being actively exploited?

No, there are no confirmed reports of active exploitation or public proof-of-concept exploits available as of the advisory date. However, the vulnerability requires low complexity to trigger and affects local authenticated users, making it a credible threat in multi-user environments.

What versions of Kernel are affected by CVE-2024-26622?

Linux kernel versions 6.7.0 through 6.7.8 are vulnerable. Kernel 6.7.9 and later versions include the fix.

How do I check if my server is vulnerable to CVE-2024-26622?

Run 'uname -r' to display your kernel version; if it shows 6.7.0 to 6.7.8, you are vulnerable. Additionally, check if TOMOYO is active with 'cat /sys/kernel/security/lsm' — the vulnerability is only exploitable if TOMOYO is loaded.

Does Defensia detect CVE-2024-26622?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Linux kernel is installed on a monitored server, CVE-2024-26622 will appear in your dashboard with remediation steps and risk scoring.

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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