SB2026100501 - Red Hat Enterprise Linux 10 update for kernel
Published: October 5, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 19 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-63917)
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 the vti6 tunnel handling code in net/ipv6/ip6_vti.c when changing the configuration of a vti6 device after moving it across network namespaces. A local user can move a vti6 device between namespaces and then change its link parameters to cause a denial of service.
The issue is reachable from an unprivileged user namespace and may have cross-tenant impact on container hosts.
2) Use-after-free (CVE-ID: CVE-2026-74746)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a use-after-free in the netfilter flowtable subsystem when inserting flow tuple nodes into the rhashtable. A remote attacker can trigger garbage collection to observe a partially installed flow to execute arbitrary code.
KASAN reported read and write access to freed slab memory in the flowtable and rhashtable path.
3) Out-of-bounds write (CVE-ID: CVE-2026-72098)
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 dm-verity fec calculation when processing erasure data during FEC decoding. A local user can trigger crafted corruption conditions to cause memory corruption.
The out-of-bounds write can occur when the erasure count exceeds the intended Reed-Solomon roots limit and the decoder writes past the end of the lambda array into the syndrome buffer.
4) Heap-based buffer overflow (CVE-ID: CVE-2026-72130)
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 nvmet_execute_auth_receive() and the DH-HMAC-CHAP response builders when processing AUTH_RECEIVE commands with a too-short allocation length. A remote user can send a specially crafted AUTH_RECEIVE command to cause a denial of service.
This is reachable only when in-band DH-HMAC-CHAP authentication is configured on the target.
5) Use-after-free (CVE-ID: CVE-2026-68426)
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 validate_xmit_xfrm() in net/xfrm/xfrm_device.c when processing GSO segment lists with asynchronous crypto handling. A local user can trigger asynchronous processing that steals a segment and leaves a stale skb->prev pointer to cause a denial of service.
The issue occurs when a stolen segment remains referenced as the list tail and is later dereferenced by validate_xmit_skb_list().
6) Improper access control (CVE-ID: CVE-2026-68294)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass network namespace isolation.
The vulnerability exists due to improper access control in the AF_QIPCRTR socket creation logic and global QRTR state handling when creating and using QRTR sockets from a separate network namespace. A local user can create an AF_QIPCRTR socket in another network namespace and send crafted QRTR datagrams to sockets owned by a different namespace to bypass network namespace isolation.
The receiving socket may treat the message as originating from node id 1, making it indistinguishable from a legitimate local client.
7) Improper Initialization (CVE-ID: CVE-2026-64368)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper initialization in slab allocation handling in mm/slub.c when allocating kmalloc objects with zeroing enabled. A local user can trigger a memory allocation pattern that leaves part of the allocated object uninitialized to disclose sensitive information.
The issue occurs when requested-size tracking is not enabled while red zoning alone is enabled, which can break krealloc() __GFP_ZERO expectations.
8) Use-after-free (CVE-ID: CVE-2026-64438)
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 use-after-free in the VF2PF response workqueue handling in the intel_qat SR-IOV implementation when processing VF2PF messages during SR-IOV teardown. A local user can trigger concurrent VF2PF work so that a queued or in-flight worker dereferences freed per-VF state to cause a denial of service.
The issue occurs because PF-side response work stores a raw pointer to per-VF state that may be freed by adf_disable_sriov() before queued work completes.
9) Out-of-bounds read (CVE-ID: CVE-2026-64191)
CWE-ID: CWE-125 - Out-of-bounds read
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 out-of-bounds read and out-of-bounds write in stub_xfer() in the i2c-stub driver when handling an I2C_SMBUS ioctl with I2C_SMBUS_I2C_BLOCK_DATA and an invalid block length. A local user can issue a crafted ioctl request with data->block[0] greater than 32 to cause a denial of service.
The issue affects the development and test i2c-stub driver, which is not built by default and must be loaded with a chip_addr= parameter.
10) Use-after-free (CVE-ID: CVE-2026-64017)
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 blk-mq cached request handling in block/blk-mq.c when submitting a bio while a cached request is peeked and the task sleeps before it is removed from the plug list. A local user can trigger request handling that hits this race condition to cause a denial of service.
The issue occurs when a plug flush frees cached requests before the cached request is popped for use.
11) Out-of-bounds read (CVE-ID: CVE-2026-22984)
CWE-ID: CWE-125 - Out-of-bounds read
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 perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the process_auth_done() function in net/ceph/messenger_v2.c. A local user can perform a denial of service (DoS) attack.
12) Use-after-free (CVE-ID: CVE-2026-63919)
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 xfrm transport-mode deferred reinjection handling in net/xfrm/xfrm_input.c when processing deferred transport reinjection callbacks that use a stored network namespace pointer. A local user can trigger deferred transport reinjection with a dangling net namespace reference to cause a denial of service.
13) Improper access control (CVE-ID: CVE-2026-63921)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to redirect packets across network namespaces.
The vulnerability exists due to improper access control in vti6_siocdevprivate() in the IPv6 VTI tunnel handling code when processing SIOCCHGTUNNEL requests on a migrated tunnel. A local user can supply tunnel parameters that collide with a tunnel in the creation namespace to redirect packets across network namespaces.
Exploitation is reachable from an unprivileged user namespace and can have cross-tenant scope on container hosts.
14) Use-after-free (CVE-ID: CVE-2026-53239)
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 xfrm_policy_bysel_ctx() and inexact bin handling in the xfrm policy subsystem when processing concurrent policy deletion and hash rebuild operations. A local user can trigger a race condition to cause a denial of service.
The issue occurs because an inexact bin may be freed during a window after the policy lock is released and before pruning is performed.
15) Double free (CVE-ID: CVE-2026-52993)
CWE-ID: CWE-415 - Double 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 double free in tipc_buf_append() when validating a reassembled skb after tipc_msg_validate() reallocates it. A local user can trigger the error-handling path with a crafted TIPC message to cause a denial of service.
16) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-43493)
CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions
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 error conditions in the pcrypt crypto subsystem when processing MAY_BACKLOG requests. A local user can trigger requests that return EBUSY to cause a denial of service.
17) Use-after-free (CVE-ID: CVE-2026-31581)
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 usb6fire_chip_abort() in the ALSA 6fire USB driver when handling device disconnect. A local user can trigger a device disconnect to cause a denial of service.
The issue occurs because the card private data may be freed synchronously when no file handles are open, after which the code accesses the freed chip structure.
18) Use-after-free (CVE-ID: CVE-2026-31663)
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 xfrm_input_resume and transport_finish when processing packets after asynchronous crypto completion. A local user can trigger a race with device teardown to cause a denial of service.
19) Resource exhaustion (CVE-ID: CVE-2026-31467)
CWE-ID: CWE-400 - Resource exhaustion
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 resource management in the erofs bio completion path when processing decompression in process context. A local user can trigger memory pressure during this operation to cause a denial of service.
The issue can lead to a deadlock when memory reclaim causes swap I/O through submit_bio_wait.
Remediation
Install update from vendor's website.