Red Hat Security Advisory: kernel security and bug fix update

Fixed packages 59

Vulnerabilities 7

• High 7.8
  CVE-2023-3776 Public exploit

  Use-after-free in Linux kernel's net/sched: cls_fw component

  A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the refere…

  Linux kernel linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 21, 2023
• High 7.8
  CVE-2023-3812

  Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

  An out-of-bounds memory access flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate …

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux
  Jul 24, 2023
• High 7.8
  CVE-2023-4004

  Kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()

  A use-after-free flaw was found in the Linux kernel's netfilter in the way a user triggers the nft_pipapo_remove function with the element, without a NFT_SET_EXT_KEY_END. This issue could allow a local user to crash the system or potentially escalate their pr…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux
  Jul 31, 2023
• High 7.8
  CVE-2023-4147 Public exploit

  Kernel: netfilter: nf_tables_newrule when adding a rule with nfta_rule_chain_id leads to use-after-free

  A use-after-free flaw was found in the Linux kernel’s Netfilter functionality when adding a rule with NFTA_RULE_CHAIN_ID. This flaw allows a local user to crash or escalate their privileges on the system.

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux
  Aug 7, 2023
• High 7.0
  CVE-2023-42753

  Kernel: netfilter: potential slab-out-of-bound access due to integer underflow

  An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decrement a memory buffer o…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux
  Sep 25, 2023
• Unscored —
  CVE-2023-0590

  A use-after-free flaw was found in qdisc_graft in net/sched/sch_api.c in the Linux Kernel due to a race problem. This f…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux
  Mar 23, 2023
• Unscored —
  CVE-2023-20593 Public exploit

  An issue in “Zen 2” CPUs, under specific microarchitectural circumstances, may allow an attacker to potentially access …

  AMD 2nd Gen AMD EPYC™ Processors Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne” 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT Debian Ubuntu Alpine
  Jul 24, 2023

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2165741
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2217845
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2224048
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2225097
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2225239
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2225275
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2239843
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2023/rhsa-2023_7382.json
• report
  https://access.redhat.com/security/cve/CVE-2023-0590
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-0590
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-0590
• article
  https://lore.kernel.org/all/20221018203258.2793282-1-edumazet@google.com/
• report
  https://access.redhat.com/security/cve/CVE-2023-3776
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-3776
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-3776
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f
• report
  https://access.redhat.com/security/cve/CVE-2023-3812
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-3812
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-3812
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0
• report
  https://access.redhat.com/security/cve/CVE-2023-4004
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-4004
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-4004
• article
  https://patchwork.ozlabs.org/project/netfilter-devel/patch/20230719190824.21196-1-fw@strlen.de/
• report
  https://access.redhat.com/security/cve/CVE-2023-4147
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-4147
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-4147
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ebc1064e4874d5987722a2ddbc18f94aa53b211
• article
  https://www.spinics.net/lists/stable/msg671573.html
• report
  https://access.redhat.com/security/cve/CVE-2023-20593
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-20593
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-20593
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=522b1d69219d8f083173819fde04f994aa051a98
• article
  https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7008.html
• report
  https://access.redhat.com/security/cve/CVE-2023-42753
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-42753
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-42753
• article
  https://seclists.org/oss-sec/2023/q3/216