CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2021-47506 – nfsd: fix use-after-free due to delegation race
https://notcve.org/view.php?id=CVE-2021-47506
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 "nfsd: grant read delegations to clients holding writes" made this bug easier to hit, but I looked as far back as v3.0 and it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have been there from the beginning. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: corrige el use-after-free debido a la ejecución de delegación. • https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebce https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4 https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536ee https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4 https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09 https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373 https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3 https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f71 •
CVSS: -EPSS: 0%CPEs: 5EXPL: 0CVE-2021-47505 – aio: fix use-after-free due to missing POLLFREE handling
https://notcve.org/view.php?id=CVE-2021-47505
In the Linux kernel, the following vulnerability has been resolved: aio: fix use-after-free due to missing POLLFREE handling signalfd_poll() and binder_poll() are special in that they use a waitqueue whose lifetime is the current task, rather than the struct file as is normally the case. This is okay for blocking polls, since a blocking poll occurs within one task; however, non-blocking polls require another solution. This solution is for the queue to be cleared before it is freed, by sending a POLLFREE notification to all waiters. Unfortunately, only eventpoll handles POLLFREE. A second type of non-blocking poll, aio poll, was added in kernel v4.18, and it doesn't handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with aio poll, and the waitqueue gets freed. Fix this by making aio poll handle POLLFREE. A patch by Ramji Jiyani <ramjiyani@google.com> (https://lore.kernel.org/r/20211027011834.2497484-1-ramjiyani@google.com) tried to do this by making aio_poll_wake() always complete the request inline if POLLFREE is seen. • https://git.kernel.org/stable/c/2c14fa838cbefc23cf1c73ca167ed85b274b2913 https://git.kernel.org/stable/c/321fba81ec034f88aea4898993c1bf15605c023f https://git.kernel.org/stable/c/4105e6a128e8a98455dfc9e6dbb2ab0c33c4497f https://git.kernel.org/stable/c/47ffefd88abfffe8a040bcc1dd0554d4ea6f7689 https://git.kernel.org/stable/c/60d311f9e6381d779d7d53371f87285698ecee24 https://git.kernel.org/stable/c/50252e4b5e989ce64555c7aef7516bdefc2fea72 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2021-47504 – io_uring: ensure task_work gets run as part of cancelations
https://notcve.org/view.php?id=CVE-2021-47504
In the Linux kernel, the following vulnerability has been resolved: io_uring: ensure task_work gets run as part of cancelations If we successfully cancel a work item but that work item needs to be processed through task_work, then we can be sleeping uninterruptibly in io_uring_cancel_generic() and never process it. Hence we don't make forward progress and we end up with an uninterruptible sleep warning. While in there, correct a comment that should be IFF, not IIF. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring: garantiza que task_work se ejecute como parte de las cancelaciones. Si cancelamos con éxito un elemento de trabajo pero ese elemento de trabajo debe procesarse a través de task_work, entonces podemos estar durmiendo ininterrumpidamente en io_uring_cancel_generic() y nunca procesarlo. Por lo tanto, no avanzamos y terminamos con un aviso de sueño ininterrumpido. • https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47502 – ASoC: codecs: wcd934x: handle channel mappping list correctly
https://notcve.org/view.php?id=CVE-2021-47502
In the Linux kernel, the following vulnerability has been resolved: ASoC: codecs: wcd934x: handle channel mappping list correctly Currently each channel is added as list to dai channel list, however there is danger of adding same channel to multiple dai channel list which endups corrupting the other list where its already added. This patch ensures that the channel is actually free before adding to the dai channel list and also ensures that the channel is on the list before deleting it. This check was missing previously, and we did not hit this issue as we were testing very simple usecases with sequence of amixer commands. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: códecs: wcd934x: maneja correctamente la lista de asignación de canales Actualmente, cada canal se agrega como lista a la lista de canales dai, sin embargo, existe el peligro de agregar el mismo canal a varias listas de canales dai, lo que termina corrompiendo la otra lista donde ya está agregada. Este parche garantiza que el canal esté realmente libre antes de agregarlo a la lista de canales dai y también garantiza que el canal esté en la lista antes de eliminarlo. Esta verificación faltaba anteriormente y no encontramos este problema ya que estábamos probando casos de uso muy simples con una secuencia de comandos de amixer. • https://git.kernel.org/stable/c/a70d9245759a48e57bb1dc9f63213dcf3017db32 https://git.kernel.org/stable/c/1089dac26c6b4b833323ae6c0ceab29fb30ede72 https://git.kernel.org/stable/c/339ffb5b56005582aacc860524d2d208604049d1 https://git.kernel.org/stable/c/23ba28616d3063bd4c4953598ed5e439ca891101 •
CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47501 – i40e: Fix NULL pointer dereference in i40e_dbg_dump_desc
https://notcve.org/view.php?id=CVE-2021-47501
In the Linux kernel, the following vulnerability has been resolved: i40e: Fix NULL pointer dereference in i40e_dbg_dump_desc When trying to dump VFs VSI RX/TX descriptors using debugfs there was a crash due to NULL pointer dereference in i40e_dbg_dump_desc. Added a check to i40e_dbg_dump_desc that checks if VSI type is correct for dumping RX/TX descriptors. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: i40e: Se corrigió la desreferencia del puntero NULL en i40e_dbg_dump_desc Al intentar volcar los descriptores VF VSI RX/TX usando debugfs, se produjo un bloqueo debido a la desreferencia del puntero NULL en i40e_dbg_dump_desc. Se agregó una verificación a i40e_dbg_dump_desc que verifica si el tipo de VSI es correcto para volcar descriptores RX/TX. • https://git.kernel.org/stable/c/02e9c290814cc143ceccecb14eac3e7a05da745e https://git.kernel.org/stable/c/e5b7fb2198abc50058f1a29c395b004f76ab1c83 https://git.kernel.org/stable/c/16431e442db248ecd8aa9457cf0a656f1885f56e https://git.kernel.org/stable/c/23ec111bf3549aae37140330c31a16abfc172421 https://access.redhat.com/security/cve/CVE-2021-47501 https://bugzilla.redhat.com/show_bug.cgi?id=2283453 • CWE-476: NULL Pointer Dereference •