Most recent entries from all

bdu:2025-15052

BELL-CVE-2024-53044

Affected: Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

certfr-2025-avi-0152 — De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu. Certaines d'entre elles permettent à un a…

certfr-2025-avi-0152

cnvd-2024-46447

EUVD-2026-346376

fkie_cve-2024-53044

In the Linux kernel, the following vulnerability has been resolved:

net/sched: sch_api: fix xa_insert() error path in tcf_block_get_ext()

This command:

$ tc qdisc replace dev eth0 ingress_block 1 egress_block 1 clsact Error: block dev insert failed: -EBUSY.

fails because user space requests the same block index to be set for both ingress and egress.

[ side note, I don't think it even failed prior to commit 913b47d3424e ("net/sched: Introduce tc block netdev tracking infra"), because this is a command from an old set of notes of mine which used to work, but alas, I did not scientifically bisect this ]

The problem is not that it fails, but rather, that the second time around, it fails differently (and irrecoverably):

$ tc qdisc replace dev eth0 ingress_block 1 egress_block 1 clsact Error: dsa_core: Flow block cb is busy.

[ another note: the extack is added by me for illustration purposes. the context of the problem is that clsact_init() obtains the same &q->ingress_block pointer as &q->egress_block, and since we call tcf_block_get_ext() on both of them, "dev" will be added to the block->ports xarray twice, thus failing the operation: once through the ingress block pointer, and once again through the egress block pointer. the problem itself is that when xa_insert() fails, we have emitted a FLOW_BLOCK_BIND command through ndo_setup_tc(), but the offload never sees a corresponding FLOW_BLOCK_UNBIND. ]

Even correcting the bad user input, we still can…

GHSA-g4gg-7gqp-cf6m

In the Linux kernel, the following vulnerability has been resolved:

net/sched: sch_api: fix xa_insert() error path in tcf_block_get_ext()

This command:

$ tc qdisc replace dev eth0 ingress_block 1 egress_block 1 clsact Error: block dev insert failed: -EBUSY.

fails because user space requests the same block index to be set for both ingress and egress.

The problem is not that it fails, but rather, that the second time around, it fails differently (and irrecoverably):

$ tc qdisc replace dev eth0 ingress_block 1 egress_block 1 clsact Error: dsa_core: Flow block cb is busy.

Even correcting the bad user input, we still can…

RHSA-2025:6966 — Red Hat Security Advisory: kernel security update

kernel: xen-netfront: Fix NULL sring after live migration kernel: fscache: Fix oops due to race with cookie_lru and use_cookie kernel: tracing: Free buffers when a used dynamic event is removed kernel: net: tun: Fix use-after-free in tun_detach() kernel: hwmon: (ibmpex) Fix possible UAF when ibmpex_register_bmc() fails kernel: erofs/zmap.c: Fix incorrect offset calculation kernel: arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud kernel: s390: avoid using global register for current_stack_pointer kernel: erofs: fix missing xas_retry() in fscache mode kernel: rpmsg: qcom_smd: Fix refcount leak in qcom_smd_parse_edge kernel: remoteproc: k3-r5: Fix refcount leak in k3_r5_cluster_of_init kernel: of: check previous kernel's ima-kexec-buffer against memory bounds kernel: coresight: Clear the connection field properly kernel: Linux kernel: Denial of Service in coresight: trbe kernel: rpmsg: char: Avoid double destroy of default endpoint kernel: coresight: cti: Fix hang in cti_disable_hw() kernel: lib/fonts: fix undefined behavior in bit shift for get_default_font kernel: Kernel: Denial of Service in pci_endpoint_test due to zero-length DMA mapping kernel: Linux kernel: Denial of Service in erofs due to memory leak kernel: erofs: fix missing unmap if z_erofs_get_extent_compressedlen() fails kernel: pipe: wakeup wr_wait after setting max_usage kernel: ntb: intel: Fix the NULL vs IS_ERR() bug for debugfs_create_dir() kernel: qed/qed_sriov: guard against NULL derefs from qed_…

UBUNTU-CVE-2024-53044

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3, Ubuntu:18.04:LTS: linux-gke-4.15, Ubuntu:18.04:LTS: linux-gke-5.4 and 103 more

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_api: fix xa_insert() error path in tcf_block_get_ext() This command: $ tc qdisc replace dev eth0 ingress_block 1 egress_block 1 clsact Error: block dev insert failed: -EBUSY. fails because user space requests the same block index to be set for both ingress and egress. [ side note, I don't think it even failed prior to commit 913b47d3424e ("net/sched: Introduce tc block netdev tracking infra"), because this is a command from an old set of notes of mine which used to work, but alas, I did not scientifically bisect this ] The problem is not that it fails, but rather, that the second time around, it fails differently (and irrecoverably): $ tc qdisc replace dev eth0 ingress_block 1 egress_block 1 clsact Error: dsa_core: Flow block cb is busy. [ another note: the extack is added by me for illustration purposes. the context of the problem is that clsact_init() obtains the same &q->ingress_block pointer as &q->egress_block, and since we call tcf_block_get_ext() on both of them, "dev" will be added to the block->ports xarray twice, thus failing the operation: once through the ingress block pointer, and once again through the egress block pointer. the problem itself is that when xa_insert() fails, we have emitted a FLOW_BLOCK_BIND command through ndo_setup_tc(), but the offload never sees a corresponding FLOW_BLOCK_UNBIND. ] Even correcting the bad user input, we still cannot recov…

WID-SEC-W-2024-3509 — Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Ein Angreifer kann mehrere Schwachstellen in Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.