high CVSS 7.8

CVE-2024-46713·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: perf/aux: Fix AUX buffer serialization Ole reported that event->mmap_mutex is strictly insufficient to serialize the AUX buffer, add a per RB mutex to fully serialize it. Note that in the lock order comment the perf_event::mmap_mutex order was already wrong, that is, it nesting under mmap_lock is not new with this patch.

Severity
high
Software
Kernel
Fixed in
6.10.10
Published
2024-09-13

Affected versions

From: 6.7

Until: 6.10.10

Fixed in: 6.10.10

How to fix this CVE

Update your Linux kernel to version 6.10.10 or later to resolve a race condition in the performance monitoring (perf) AUX buffer handling that could allow local privilege escalation. This vulnerability affects kernel versions 6.7 through 6.10.9 and requires a kernel update followed by a system reboot to take effect.

sudo dnf update kernel kernel-devel && sudo reboot

Defensia detects this vulnerability

How to check if you are affected

  1. Run 'uname -r' to check your current kernel version and verify it is below 6.10.10
  2. Check if performance monitoring (perf) subsystem is enabled by running 'cat /boot/config-$(uname -r) | grep CONFIG_PERF_EVENTS' and verify the output is 'CONFIG_PERF_EVENTS=y'
  3. Monitor kernel logs for perf-related errors or race conditions using 'sudo dmesg | grep -i perf' or 'sudo journalctl -k | grep -i perf'
  4. After patching, verify the new kernel version with 'uname -r' and confirm it matches 6.10.10 or newer

FAQ

What is CVE-2024-46713?

This CVE addresses a synchronization flaw in the Linux kernel's performance monitoring (perf) auxiliary buffer mechanism where insufficient locking could allow a local attacker with user-level privileges to cause a race condition resulting in memory corruption and privilege escalation.

Is CVE-2024-46713 being actively exploited?

No, this vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog and no public exploits are currently available, though the high CVSS score (7.8) indicates significant risk potential.

What versions of Kernel are affected by CVE-2024-46713?

Linux kernel versions 6.7 through 6.10.9 are vulnerable; kernel 6.10.10 and later contain the fix.

How do I check if my server is vulnerable to CVE-2024-46713?

Run 'uname -r' to display your kernel version; if it reports a version between 6.7 and 6.10.9, your system is vulnerable.

Does Defensia detect CVE-2024-46713?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Kernel is installed on a monitored server, CVE-2024-46713 will appear in your dashboard with remediation steps.

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CVE-2026-100075CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters When srpt_alloc_rw_ctxs() fails partway through a multi-buffer indirect descriptor, the unwind path destroys RDMA contexts but leaves stale n_rw_ctx and n_rdma values (and a dangling rw_ctxs pointer). Later sq_wr_avail accounting in srpt_queue_response() or srpt_write_pending() can then subtract the wrong number of send queue credits. Reset the counters and clear rw_ctxs after freeing the heap allocation before returning an error.
CVE-2026-64033CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs: Fix use-after-free in path file creation cleanup In the error path of rtrs_srv_create_path_files(), the sysfs root folders may already have been created and srv_path->kobj may already have been initialized. If a later step fails, the cleanup currently calls kobject_put(&srv_path->kobj) before rtrs_srv_destroy_once_sysfs_root_folders(srv_path). kobject_put() may drop the last reference to srv_path->kobj and invoke the release callback, rtrs_srv_release(), which frees srv_path. The following call to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then dereferences srv_path internally to access srv_path->srv, resulting in a use-after-free. This failure path is reached before rtrs_srv_create_path_files() returns success, so the successful-path lifetime handling is not involved. Fix this by destroying the sysfs root folders before calling kobject_put(&srv_path->kobj), so srv_path is still valid while the helper accesses it. This issue was found by a static analysis tool I am developing.
CVE-2026-64007CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: refresh tcphdr after skb_ensure_writable synproxy_tstamp_adjust() rewrites the TCP timestamp option in place and then patches the TCP checksum via inet_proto_csum_replace4() on the caller-supplied tcphdr pointer. Both ipv4_synproxy_hook() and ipv6_synproxy_hook() obtain that pointer with skb_header_pointer() before calling in, so it may either alias skb->head directly or point at the caller's on-stack _tcph buffer. Between obtaining the pointer and using it, the function calls skb_ensure_writable(skb, optend), which on a cloned or non-linear skb invokes pskb_expand_head() and frees the old skb->head. After that point the cached th is stale: caller (ipv[46]_synproxy_hook) th = skb_header_pointer(skb, ..., &_tcph) synproxy_tstamp_adjust(skb, protoff, th, ...) skb_ensure_writable(skb, optend) pskb_expand_head() /* kfree(old skb->head) */ ... inet_proto_csum_replace4(&th->check, ...) /* writes into freed head, or into the caller's stack copy leaving the on-wire checksum stale */ The option bytes are written through skb->data and are fine; only the checksum update goes through th and so lands in the wrong place. The result is either a write into freed slab memory or a packet leaving with a checksum that does not match its payload. Fix by re-deriving th from skb->data + protoff immediately after skb_ensure_writable() succeeds, so the subsequent checksum update targets the linear, writable header.
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References

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