CVSS: 3.3EPSS: 0%CPEs: 1EXPL: 0CVE-2023-46837 – arm32: The cache may not be properly cleaned/invalidated (take two)
https://notcve.org/view.php?id=CVE-2023-46837
05 Jan 2024 — Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory. This undefined behavior was meant to be addressed by XSA-4... • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JFVKWYQFRUU3CAS53THTUKXEOUDWI42G • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 5.5EPSS: 0%CPEs: 1EXPL: 0CVE-2023-34323 – xenstored: A transaction conflict can crash C Xenstored
https://notcve.org/view.php?id=CVE-2023-34323
05 Jan 2024 — When a transaction is committed, C Xenstored will first check the quota is correct before attempting to commit any nodes. It would be possible that accounting is temporarily negative if a node has been removed outside of the transaction. Unfortunately, some versions of C Xenstored are assuming that the quota cannot be negative and are using assert() to confirm it. This will lead to C Xenstored crash when tools are built without -DNDEBUG (this is the default). Cuando se confirma una transacción, C Xenstored ... • https://xenbits.xenproject.org/xsa/advisory-440.html • CWE-476: NULL Pointer Dereference •
CVSS: 7.8EPSS: 0%CPEs: 1EXPL: 0CVE-2023-34322 – top-level shadow reference dropped too early for 64-bit PV guests
https://notcve.org/view.php?id=CVE-2023-34322
05 Jan 2024 — For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on the shadow of the guest root page table. In the course of dealing with shortage of memory in the shadow pool associated with a domain, shadows of page tables may be torn down. This tearing down may include the shado... • https://xenbits.xenproject.org/xsa/advisory-438.html • CWE-273: Improper Check for Dropped Privileges •
CVSS: 3.3EPSS: 0%CPEs: 1EXPL: 0CVE-2023-34321 – arm32: The cache may not be properly cleaned/invalidated
https://notcve.org/view.php?id=CVE-2023-34321
05 Jan 2024 — Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory. Arm proporciona múltiples ayudas para limpiar e invalidar ... • https://xenbits.xenproject.org/xsa/advisory-437.html • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 7.8EPSS: 0%CPEs: 10EXPL: 0CVE-2023-34319 – Linux: buffer overrun in netback due to unusual packet
https://notcve.org/view.php?id=CVE-2023-34319
21 Aug 2023 — The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the drive... • http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html • CWE-787: Out-of-bounds Write •
CVSS: 7.8EPSS: 0%CPEs: 4EXPL: 0CVE-2022-42332 – Debian Security Advisory 5378-1
https://notcve.org/view.php?id=CVE-2022-42332
21 Mar 2023 — x86 shadow plus log-dirty mode use-after-free In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Shadow mode maintains a pool of memory used for both shadow page tables as well as auxiliary data structures. To migrate or snapshot guests, Xen additionally runs them in so called log-dirty mode. The data structures needed by the log-dirty tracking are part of aformentioned auxiliary data. In order... • http://www.openwall.com/lists/oss-security/2023/03/21/1 • CWE-416: Use After Free •
CVSS: 5.6EPSS: 0%CPEs: 5EXPL: 0CVE-2022-33748 – Gentoo Linux Security Advisory 202402-07
https://notcve.org/view.php?id=CVE-2022-33748
11 Oct 2022 — lock order inversion in transitive grant copy handling As part of XSA-226 a missing cleanup call was inserted on an error handling path. While doing so, locking requirements were not paid attention to. As a result two cooperating guests granting each other transitive grants can cause locks to be acquired nested within one another, but in respectively opposite order. With suitable timing between the involved grant copy operations this may result in the locking up of a CPU. Inversión del orden de bloqueo en e... • http://www.openwall.com/lists/oss-security/2022/10/11/2 • CWE-755: Improper Handling of Exceptional Conditions •
CVSS: 5.6EPSS: 0%CPEs: 6EXPL: 0CVE-2022-26356 – Gentoo Linux Security Advisory 202402-07
https://notcve.org/view.php?id=CVE-2022-26356
05 Apr 2022 — Racy interactions between dirty vram tracking and paging log dirty hypercalls Activation of log dirty mode done by XEN_DMOP_track_dirty_vram (was named HVMOP_track_dirty_vram before Xen 4.9) is racy with ongoing log dirty hypercalls. A suitably timed call to XEN_DMOP_track_dirty_vram can enable log dirty while another CPU is still in the process of tearing down the structures related to a previously enabled log dirty mode (XEN_DOMCTL_SHADOW_OP_OFF). This is due to lack of mutually exclusive locking between ... • http://www.openwall.com/lists/oss-security/2022/04/05/1 • CWE-667: Improper Locking •
CVSS: 5.5EPSS: 0%CPEs: 4EXPL: 0CVE-2022-23034 – Gentoo Linux Security Advisory 202208-23
https://notcve.org/view.php?id=CVE-2022-23034
25 Jan 2022 — A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a mapping can be requested in two steps. The reference count for such a mapping would then mistakenly be decremented twice. Underflow of the counters gets detected, resulting in the triggering of a hypervisor bug check... • http://www.openwall.com/lists/oss-security/2022/01/25/3 • CWE-191: Integer Underflow (Wrap or Wraparound) •
CVSS: 7.0EPSS: 0%CPEs: 1EXPL: 0CVE-2021-28703 – Gentoo Linux Security Advisory 202402-07
https://notcve.org/view.php?id=CVE-2021-28703
07 Dec 2021 — grant table v2 status pages may remain accessible after de-allocation (take two) Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing re... • https://security.gentoo.org/glsa/202402-07 •