CVSS: -EPSS: 0%CPEs: 6EXPL: 0CVE-2021-47301 – igb: Fix use-after-free error during reset
https://notcve.org/view.php?id=CVE-2021-47301
In the Linux kernel, the following vulnerability has been resolved: igb: Fix use-after-free error during reset Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring. Failure to do so can cause invalid memory accesses. If igb_poll() runs while the controller is reset this can lead to the driver try to free a skb that was already freed. (The crash is harder to reproduce with the igb driver, but the same potential problem exists as the code is identical to igc) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: igb: corrige el error de use after free durante el reinicio. Limpia el siguiente descriptor a observar (next_to_watch) al limpiar el anillo TX. De lo contrario, se pueden producir accesos a la memoria no válidos. Si igb_poll() se ejecuta mientras se reinicia el controlador, esto puede hacer que el controlador intente liberar un skb que ya estaba liberado. • https://git.kernel.org/stable/c/7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0 https://git.kernel.org/stable/c/d7367f781e5a9ca5df9082b15b272b55e76931f8 https://git.kernel.org/stable/c/d3ccb18ed5ac3283c7b31ecc685b499e580d5492 https://git.kernel.org/stable/c/88e0720133d42d34851c8721cf5f289a50a8710f https://git.kernel.org/stable/c/f153664d8e70c11d0371341613651e1130e20240 https://git.kernel.org/stable/c/8e24c12f2ff6d32fd9f057382f08e748ec97194c https://git.kernel.org/stable/c/7b292608db23ccbbfbfa50cdb155d01725d7a52e •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47300 – bpf: Fix tail_call_reachable rejection for interpreter when jit failed
https://notcve.org/view.php?id=CVE-2021-47300
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix tail_call_reachable rejection for interpreter when jit failed During testing of f263a81451c1 ("bpf: Track subprog poke descriptors correctly and fix use-after-free") under various failure conditions, for example, when jit_subprogs() fails and tries to clean up the program to be run under the interpreter, we ran into the following freeze: [...] #127/8 tailcall_bpf2bpf_3:FAIL [...] [ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20 [ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682 [ 92.043707] [ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87 [ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 [ 92.046785] Call Trace: [ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0 [ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.049019] ? ktime_get+0x117/0x130 [...] // few hundred [similar] lines more [ 92.659025] ? • https://git.kernel.org/stable/c/e411901c0b775a3ae7f3e2505f8d2d90ac696178 https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4 https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47299 – xdp, net: Fix use-after-free in bpf_xdp_link_release
https://notcve.org/view.php?id=CVE-2021-47299
In the Linux kernel, the following vulnerability has been resolved: xdp, net: Fix use-after-free in bpf_xdp_link_release The problem occurs between dev_get_by_index() and dev_xdp_attach_link(). At this point, dev_xdp_uninstall() is called. Then xdp link will not be detached automatically when dev is released. But link->dev already points to dev, when xdp link is released, dev will still be accessed, but dev has been released. dev_get_by_index() | link->dev = dev | | rtnl_lock() | unregister_netdevice_many() | dev_xdp_uninstall() | rtnl_unlock() rtnl_lock(); | dev_xdp_attach_link() | rtnl_unlock(); | | netdev_run_todo() // dev released bpf_xdp_link_release() | /* access dev. | use-after-free */ | [ 45.966867] BUG: KASAN: use-after-free in bpf_xdp_link_release+0x3b8/0x3d0 [ 45.967619] Read of size 8 at addr ffff00000f9980c8 by task a.out/732 [ 45.968297] [ 45.968502] CPU: 1 PID: 732 Comm: a.out Not tainted 5.13.0+ #22 [ 45.969222] Hardware name: linux,dummy-virt (DT) [ 45.969795] Call trace: [ 45.970106] dump_backtrace+0x0/0x4c8 [ 45.970564] show_stack+0x30/0x40 [ 45.970981] dump_stack_lvl+0x120/0x18c [ 45.971470] print_address_description.constprop.0+0x74/0x30c [ 45.972182] kasan_report+0x1e8/0x200 [ 45.972659] __asan_report_load8_noabort+0x2c/0x50 [ 45.973273] bpf_xdp_link_release+0x3b8/0x3d0 [ 45.973834] bpf_link_free+0xd0/0x188 [ 45.974315] bpf_link_put+0x1d0/0x218 [ 45.974790] bpf_link_release+0x3c/0x58 [ 45.975291] __fput+0x20c/0x7e8 [ 45.975706] ____fput+0x24/0x30 [ 45.976117] task_work_run+0x104/0x258 [ 45.976609] do_notify_resume+0x894/0xaf8 [ 45.977121] work_pending+0xc/0x328 [ 45.977575] [ 45.977775] The buggy address belongs to the page: [ 45.978369] page:fffffc00003e6600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f998 [ 45.979522] flags: 0x7fffe0000000000(node=0|zone=0|lastcpupid=0x3ffff) [ 45.980349] raw: 07fffe0000000000 fffffc00003e6708 ffff0000dac3c010 0000000000000000 [ 45.981309] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 45.982259] page dumped because: kasan: bad access detected [ 45.982948] [ 45.983153] Memory state around the buggy address: [ 45.983753] ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.984645] ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.985533] >ffff00000f998080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.986419] ^ [ 45.987112] ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.988006] ffff00000f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.988895] ================================================================== [ 45.989773] Disabling lock debugging due to kernel taint [ 45.990552] Kernel panic - not syncing: panic_on_warn set ... [ 45.991166] CPU: 1 PID: 732 Comm: a.out Tainted: G B 5.13.0+ #22 [ 45.991929] Hardware name: linux,dummy-virt (DT) [ 45.992448] Call trace: [ 45.992753] dump_backtrace+0x0/0x4c8 [ 45.993208] show_stack+0x30/0x40 [ 45.993627] dump_stack_lvl+0x120/0x18c [ 45.994113] dump_stack+0x1c/0x34 [ 45.994530] panic+0x3a4/0x7d8 [ 45.994930] end_report+0x194/0x198 [ 45.995380] kasan_report+0x134/0x200 [ 45.995850] __asan_report_load8_noabort+0x2c/0x50 [ 45.996453] bpf_xdp_link_release+0x3b8/0x3d0 [ 45.997007] bpf_link_free+0xd0/0x188 [ 45.997474] bpf_link_put+0x1d0/0x218 [ 45.997942] bpf_link_release+0x3c/0x58 [ 45.998429] __fput+0x20c/0x7e8 [ 45.998833] ____fput+0x24/0x30 [ 45.999247] task_work_run+0x104/0x258 [ 45.999731] do_notify_resume+0x894/0xaf8 [ 46.000236] work_pending ---truncated--- En el kernel de Linux, se resolvió la siguiente vulnerabilidad: xdp, net: corrige use-after-free en bpf_xdp_link_release. El problema ocurre entre dev_get_by_index() y dev_xdp_attach_link(). • https://git.kernel.org/stable/c/aa8d3a716b59db6c1ad6c68fb8aa05e31980da60 https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139 https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6 https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7 •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47298 – bpf, sockmap: Fix potential memory leak on unlikely error case
https://notcve.org/view.php?id=CVE-2021-47298
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix potential memory leak on unlikely error case If skb_linearize is needed and fails we could leak a msg on the error handling. To fix ensure we kfree the msg block before returning error. Found during code review. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: bpf, sockmap: corrige una posible pérdida de memoria en un caso de error poco probable. Si se necesita skb_linearize y falla, podríamos filtrar un mensaje sobre el manejo de errores. Para solucionarlo, asegúrese de liberar el bloque de mensajes antes de devolver el error. • https://git.kernel.org/stable/c/4363023d2668e621b0743db351a9555d6e6ea57e https://git.kernel.org/stable/c/715f378f42909c401ec043f5150c4fdf57fb8889 https://git.kernel.org/stable/c/6c508a1c6c62793dc6e6872cad4b200097bab7c9 https://git.kernel.org/stable/c/7e6b27a69167f97c56b5437871d29e9722c3e470 •
CVSS: 5.5EPSS: 0%CPEs: 8EXPL: 0CVE-2021-47297 – net: fix uninit-value in caif_seqpkt_sendmsg
https://notcve.org/view.php?id=CVE-2021-47297
In the Linux kernel, the following vulnerability has been resolved: net: fix uninit-value in caif_seqpkt_sendmsg When nr_segs equal to zero in iovec_from_user, the object msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg which is defined in ___sys_sendmsg. So we cann't just judge msg->msg_iter.iov->base directlly. We can use nr_segs to judge msg in caif_seqpkt_sendmsg whether has data buffers. ===================================================== BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmmsg+0x808/0xc90 net/socket.c:2480 __compat_sys_sendmmsg net/compat.c:656 [inline] En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net: corrige el valor uninit en caif_seqpkt_sendmsg. Cuando nr_segs es igual a cero en iovec_from_user, el objeto msg->msg_iter.iov es la memoria de pila uninit en caif_seqpkt_sendmsg que está definida en ___sys_sendmsg. Entonces no podemos simplemente juzgar msg->msg_iter.iov->base directamente. • https://git.kernel.org/stable/c/bece7b2398d073d11b2e352405a3ecd3a1e39c60 https://git.kernel.org/stable/c/d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3 https://git.kernel.org/stable/c/5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db https://git.kernel.org/stable/c/ffe31dd70b70a40cd6b21b78c1713a23e021843a https://git.kernel.org/stable/c/452c3ed7bf63721b07bc2238ed1261bb26027e85 https://git.kernel.org/stable/c/9413c0abb57f70a953b1116318d6aa478013c35d https://git.kernel.org/stable/c/1582a02fecffcee306663035a295e28e1c4aaaff https://git.kernel.org/stable/c/d4c7797ab1517515f0d08b3bc1c6b4888 •