CVSS: 7.1EPSS: 0%CPEs: 19EXPL: 0CVE-2021-4090
https://notcve.org/view.php?id=CVE-2021-4090
An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat. Se encontró un fallo de escritura en memoria fuera de límites (OOB) en el NFSD del kernel de Linux. Una falta de saneo puede conllevar a una escritura más allá de bmval[bmlen-1] en nfsd4_decode_bitmap4 en el archivo fs/nfsd/nfs4xdr.c. • https://bugzilla.redhat.com/show_bug.cgi?id=2025101 https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit%40klimt.1015granger.net https://security.netapp.com/advisory/ntap-20220318-0010 • CWE-787: Out-of-bounds Write •
CVSS: 7.4EPSS: 0%CPEs: 33EXPL: 0CVE-2021-4083 – kernel: fget: check that the fd still exists after getting a ref to it
https://notcve.org/view.php?id=CVE-2021-4083
A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4. Se ha encontrado un fallo de lectura de memoria previamente liberada en la recolección de basura del kernel de Linux para los manejadores de archivos de socket de dominio Unix en la forma en que los usuarios llaman a close() y fget() simultáneamente y puede potencialmente desencadenar una condición de carrera. Este fallo permite a un usuario local bloquear el sistema o escalar sus privilegios en el sistema. • https://bugzilla.redhat.com/show_bug.cgi?id=2029923 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=054aa8d439b9 https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html https://security.netapp.com/advisory/ntap-20220217-0005 https://www.debian.org/security/2022/dsa-5096 https://www.oracle.com/security-alerts/cpujul2022.html https://access.redhat.com/security/cve/CVE-202 • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') CWE-416: Use After Free •
CVSS: 4.7EPSS: 0%CPEs: 2EXPL: 0CVE-2021-4001
https://notcve.org/view.php?id=CVE-2021-4001
A race condition was found in the Linux kernel's ebpf verifier between bpf_map_update_elem and bpf_map_freeze due to a missing lock in kernel/bpf/syscall.c. In this flaw, a local user with a special privilege (cap_sys_admin or cap_bpf) can modify the frozen mapped address space. This flaw affects kernel versions prior to 5.16 rc2. Se ha encontrado una condición de carrera en el verificador ebpf del kernel de Linux entre las funciones bpf_map_update_elem y bpf_map_freeze debido a la falta de un bloqueo en el archivo kernel/bpf/syscall.c. En este fallo, un usuario local con un privilegio especial (cap_sys_admin o cap_bpf) puede modificar el espacio de direcciones mapeado congelado. • https://bugzilla.redhat.com/show_bug.cgi?id=2025645 https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition •
CVSS: 5.1EPSS: 0%CPEs: 10EXPL: 1CVE-2021-4002 – kernel: possible leak or coruption of data residing on hugetlbfs
https://notcve.org/view.php?id=CVE-2021-4002
A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data. Se encontró un fallo de pérdida de memoria en el uso de memoria hugetlbfs del kernel de Linux en la forma en que el usuario mapea algunas regiones de memoria dos veces usando shmget() que están alineadas a la alineación PUD con el fallo de algunas de las páginas de memoria. Un usuario local podría usar este fallo para conseguir acceso no autorizado a algunos datos • https://bugzilla.redhat.com/show_bug.cgi?id=2025726 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890 https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html https://www.debian.org/security/2022/dsa-5096 https://www.openwall.com/list • CWE-401: Missing Release of Memory after Effective Lifetime CWE-459: Incomplete Cleanup •
CVSS: 7.1EPSS: 0%CPEs: 29EXPL: 2CVE-2021-3743 – kernel: out-of-bound Read in qrtr_endpoint_post in net/qrtr/qrtr.c
https://notcve.org/view.php?id=CVE-2021-3743
An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel. A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability. Se ha encontrado un defecto de lectura de memoria fuera de límites (OOB) en el protocolo de router Qualcomm IPC en el kernel de Linux. Una falta de comprobación de saneo permite a un atacante local conseguir acceso de memoria fuera de límites, conllevando a un bloqueo del sistema o un filtrado de información interna del kernel. • https://bugzilla.redhat.com/show_bug.cgi?id=1997961 https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3eb https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e78c597c3ebfd0cb329aa09a838734147e4f117 https://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117 https://lists.openwall.net/netdev/2021/08/17/124 https://security.netapp.com/advisory/ntap-20220407-0007 https://www.openwall.com/lists/oss-security/2021/08/27 • CWE-125: Out-of-bounds Read •