With the aim of informing, warning and helping professionals with the latest security vulnerabilities in technology systems, we have made a database available for users interested in this information, which is in Spanish and includes all of the latest documented and recognised vulnerabilities.

This repository, with over 75,000 registers, is based on the information from the NVD ( (National Vulnerability Database) – by virtue of a partnership agreement – through which INCIBE translates the included information into Spanish.

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Publication date:
In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: fix use-after-free in tw_timer_handler<br /> <br /> A real world panic issue was found as follow in Linux 5.4.<br /> <br /> BUG: unable to handle page fault for address: ffffde49a863de28<br /> PGD 7e6fe62067 P4D 7e6fe62067 PUD 7e6fe63067 PMD f51e064067 PTE 0<br /> RIP: 0010:tw_timer_handler+0x20/0x40<br /> Call Trace:<br /> <br /> call_timer_fn+0x2b/0x120<br /> run_timer_softirq+0x1ef/0x450<br /> __do_softirq+0x10d/0x2b8<br /> irq_exit+0xc7/0xd0<br /> smp_apic_timer_interrupt+0x68/0x120<br /> apic_timer_interrupt+0xf/0x20<br /> <br /> This issue was also reported since 2017 in the thread [1],<br /> unfortunately, the issue was still can be reproduced after fixing<br /> DCCP.<br /> <br /> The ipv4_mib_exit_net is called before tcp_sk_exit_batch when a net<br /> namespace is destroyed since tcp_sk_ops is registered befrore<br /> ipv4_mib_ops, which means tcp_sk_ops is in the front of ipv4_mib_ops<br /> in the list of pernet_list. There will be a use-after-free on<br /> net-&gt;mib.net_statistics in tw_timer_handler after ipv4_mib_exit_net<br /> if there are some inflight time-wait timers.<br /> <br /> This bug is not introduced by commit f2bf415cfed7 ("mib: add net to<br /> NET_ADD_STATS_BH") since the net_statistics is a global variable<br /> instead of dynamic allocation and freeing. Actually, commit<br /> 61a7e26028b9 ("mib: put net statistics on struct net") introduces<br /> the bug since it put net statistics on struct net and free it when<br /> net namespace is destroyed.<br /> <br /> Moving init_ipv4_mibs() to the front of tcp_init() to fix this bug<br /> and replace pr_crit() with panic() since continuing is meaningless<br /> when init_ipv4_mibs() fails.<br /> <br /> [1]
Severity: Pending analysis
Last modification:

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