SB2026090801 - Red Hat Enterprise Linux 10 update for kernel
Published: September 8, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 10 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2025-40149)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the tls_device_queue_ctx_destruction() function in net/tls/tls_device.c. A local user can escalate privileges on the system.
2) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-43114)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of stale bits in nft_set_pipapo_avx2 match functions in the netfilter pipapo set implementation when processing crafted set elements during avx2-based matching. A local user can load and reload a crafted pipapo set to cause a denial of service.
The issue occurs with avx2 matching functions and can cause a non-matching expired entry to be treated as a match after a set flush and reload operation.
3) Use-after-free (CVE-ID: CVE-2026-46099)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in seg6 and rpl lwtunnels when processing IPv6 routing lookups and caching a NOREF destination entry. A local user can trigger a race condition to cause a denial of service.
Exploitation requires PREEMPT_RT without PREEMPT_RT_NEEDS_BH_LOCK and a concurrent task able to release a shared nexthop per-cpu route entry.
4) Use-after-free (CVE-ID: CVE-2026-46056)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in SSP passkey handlers when handling Bluetooth SSP passkey and keypress notification events. A local user can trigger concurrent connection teardown during event processing to cause a denial of service.
5) Out-of-bounds write (CVE-ID: CVE-2026-46145)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to overwrite kernel memory.
The vulnerability exists due to an out-of-bounds write in the RDMA/mana rx hash key handling when processing a user-supplied uAPI structure. A local user can supply a crafted rx_hash_key_len value to overwrite kernel memory.
6) Out-of-bounds read (CVE-ID: CVE-2026-46155)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in smb2_compound_op() when processing a crafted SMB server response. A remote attacker can send a truncated response with a large OutputBufferLength and an early-terminated EA list to disclose sensitive information.
7) Out-of-bounds write (CVE-ID: CVE-2026-53016)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in ccp_aes_complete() when processing AF_ALG rfc3686-ctr-aes-ccp requests. A local user can supply a request with an 8-byte IV to cause a denial of service.
8) Use-after-free (CVE-ID: CVE-2026-53006)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in icmpv6_rcv() in the IPv6 ICMP handling code when processing ICMPv6 packets. A remote attacker can send a specially crafted ICMPv6 packet to cause a denial of service.
9) Heap-based buffer overflow (CVE-ID: CVE-2026-63886)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in chap_server_compute_hash() in the iSCSI target CHAP authentication handling when processing a specially crafted base64-encoded CHAP_R response. A remote user can send a specially crafted CHAP authentication response to cause a denial of service.
The issue affects the BASE64 CHAP_R decoding path; the mutual CHAP CHAP_C decoding path is not affected.
10) Out-of-bounds write (CVE-ID: CVE-2026-64304)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in qat_rsa_setkey_crt() when processing RSA CRT key components larger than half of the key size. A local user can provide a crafted RSA CRT key to cause memory corruption.
The issue occurs because CRT components are bounded by the modulus size in the generic RSA key parser, while the QAT driver allocates half-size DMA buffers for those components.
Remediation
Install update from vendor's website.