CVSS: 5.5EPSS: 0%CPEs: 2EXPL: 0CVE-2021-47225 – mac80211: fix deadlock in AP/VLAN handling
https://notcve.org/view.php?id=CVE-2021-47225
In the Linux kernel, the following vulnerability has been resolved: mac80211: fix deadlock in AP/VLAN handling Syzbot reports that when you have AP_VLAN interfaces that are up and close the AP interface they belong to, we get a deadlock. No surprise - since we dev_close() them with the wiphy mutex held, which goes back into the netdev notifier in cfg80211 and tries to acquire the wiphy mutex there. To fix this, we need to do two things: 1) prevent changing iftype while AP_VLANs are up, we can't easily fix this case since cfg80211 already calls us with the wiphy mutex held, but change_interface() is relatively rare in drivers anyway, so changing iftype isn't used much (and userspace has to fall back to down/change/up anyway) 2) pull the dev_close() loop over VLANs out of the wiphy mutex section in the normal stop case En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mac80211: corrige el punto muerto en el manejo de AP/VLAN. • https://git.kernel.org/stable/c/a05829a7222e9d10c416dd2dbbf3929fe6646b89 https://git.kernel.org/stable/c/8043903fcb72f545c52e3ec74d6fd82ef79ce7c5 https://git.kernel.org/stable/c/d5befb224edbe53056c2c18999d630dafb4a08b9 •
CVSS: 6.2EPSS: 0%CPEs: 4EXPL: 0CVE-2021-47224 – net: ll_temac: Make sure to free skb when it is completely used
https://notcve.org/view.php?id=CVE-2021-47224
In the Linux kernel, the following vulnerability has been resolved: net: ll_temac: Make sure to free skb when it is completely used With the skb pointer piggy-backed on the TX BD, we have a simple and efficient way to free the skb buffer when the frame has been transmitted. But in order to avoid freeing the skb while there are still fragments from the skb in use, we need to piggy-back on the TX BD of the skb, not the first. Without this, we are doing use-after-free on the DMA side, when the first BD of a multi TX BD packet is seen as completed in xmit_done, and the remaining BDs are still being processed. En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:ll_temac: Asegúrate de liberar skb cuando esté completamente utilizado. • https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3 https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358 https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47 •
CVSS: -EPSS: 0%CPEs: 6EXPL: 0CVE-2021-47223 – net: bridge: fix vlan tunnel dst null pointer dereference
https://notcve.org/view.php?id=CVE-2021-47223
In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst null pointer dereference This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. ... En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: bridge: corrige la desreferencia del puntero null del túnel vlan dst Este parche corrige una desreferencia del puntero null de Tunnel_dst debido al acceso sin bloqueo en la ruta de salida del túnel. • https://git.kernel.org/stable/c/11538d039ac6efcf4f1a6c536e1b87cd3668a9fd https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79 https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530 https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7 https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f •
CVSS: -EPSS: 0%CPEs: 6EXPL: 0CVE-2021-47222 – net: bridge: fix vlan tunnel dst refcnt when egressing
https://notcve.org/view.php?id=CVE-2021-47222
In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst refcnt when egressing The egress tunnel code uses dst_clone() and directly sets the result which is wrong because the entry might have 0 refcnt or be already deleted, causing number of problems. ... kthread_mod_delayed_work+0xb6/0xb6 ret_from_fork+0x22/0x30 ---[ end trace 49f61b07f775fd2b ]--- dst_release: dst:00000000c02d677a refcnt:-1 dst_release underflow En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: bridge: corrige el refcnt dst del túnel vlan al salir El código del túnel de salida usa dst_clone() y establece directamente el resultado que es incorrecto porque la entrada puede tener 0 refcnt o ya estar eliminada , causando varios problemas. • https://git.kernel.org/stable/c/11538d039ac6efcf4f1a6c536e1b87cd3668a9fd https://git.kernel.org/stable/c/42020f7f37a90d24b9551f5f7eba3f7c7c102968 https://git.kernel.org/stable/c/84fc1c944e45ab317e2e70a0e7f76fa2a5e43b6e https://git.kernel.org/stable/c/79855be6445b6592bddb7bd7167083ec8cdbd73f https://git.kernel.org/stable/c/fc7fdd8c5c2ad2fe3e297698be9d4dbe4a4e0579 https://git.kernel.org/stable/c/25053a8404ba17ca48f5553d487afc1882e9f56c https://git.kernel.org/stable/c/cfc579f9d89af4ada58c69b03bcaa4887840f3b3 •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47221 – mm/slub: actually fix freelist pointer vs redzoning
https://notcve.org/view.php?id=CVE-2021-47221
In the Linux kernel, the following vulnerability has been resolved: mm/slub: actually fix freelist pointer vs redzoning It turns out that SLUB redzoning ("slub_debug=Z") checks from s->object_size rather than from s->inuse (which is normally bumped to make room for the freelist pointer), so a cache created with an object size less than 24 would have the freelist pointer written beyond s->object_size, causing the redzone to be corrupted by the freelist pointer. ... En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mm/slub: en realidad corrige el puntero de lista libre frente a redzoning. • https://git.kernel.org/stable/c/89b83f282d8ba380cf2124f88106c57df49c538c https://git.kernel.org/stable/c/f6ed2357541612a13a5841b3af4dc32ed984a25f https://git.kernel.org/stable/c/ce6e8bee7a3883e8008b30f5887dbb426aac6a35 https://git.kernel.org/stable/c/e41a49fadbc80b60b48d3c095d9e2ee7ef7c9a8e •