SB2026072890 - Ubuntu update for linux

Description

This security bulletin contains information about 23 vulnerabilities.

1) Stack-based buffer overflow (CVE-ID: CVE-2026-43037)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 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/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a stack-based buffer overflow in ip4ip6_err() and __ip_options_echo() when processing a crafted packet that triggers ICMP error handling on a cloned skb. A remote attacker can send a specially crafted packet to execute arbitrary code.

The issue is caused by reusing skb cb[] data written by the IPv6 receive path as IPv4 metadata, allowing attacker-controlled packet data to influence the copied option length.

2) Use After Free (CVE-ID: CVE-2026-23272)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to execute arbitrary code, escalate privileges, and cause a denial of service.

The vulnerability exists due to a use-after-free in the netfilter nf_tables component when handling set element insertion in a full set. A local user can send a specially crafted request to trigger improper RCU handling, leading to a use-after-free condition.

Exploitation requires non-administrative local privileges and does not require user interaction. The vulnerability occurs during normal operation of netfilter rules with full sets.

3) Out-of-bounds read (CVE-ID: CVE-2026-23455)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in DecodeQ931() in the nf_conntrack_h323 netfilter component when parsing a crafted Q.931 packet with a zero UserUserIE length field. A remote attacker can send a specially crafted packet to disclose sensitive information.

The issue occurs because a 16-bit length value is decremented by 1 to skip the protocol discriminator byte, and an encoded length of 0 wraps to -1 and is then passed to DecodeH323_UserInformation() as a large value.

4) Heap-based buffer overflow (CVE-ID: CVE-2026-31402)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to corrupt heap memory.

The vulnerability exists due to a heap-based buffer overflow in the NFSv4.0 LOCK replay cache when encoding denied LOCK operation responses. A remote attacker can trigger conflicting lock requests with a large lock owner value to corrupt heap memory.

The issue is caused by copying an encoded LOCK denied response into a fixed 112-byte inline replay buffer without sufficient bounds checking, resulting in a slab out-of-bounds write of up to 944 bytes. Exploitation requires two cooperating NFSv4.0 clients and can be performed remotely without authentication.

5) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-31418)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource management in mtype_del in the ipset netfilter subsystem when deleting entries from buckets containing only deleted slots below the current position. A local user can trigger bucket deletion handling with crafted set operations to cause a denial of service.

6) Heap-based buffer overflow (CVE-ID: CVE-2026-31607)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in usbip_pack_ret_submit() when processing a RET_SUBMIT response from a USB/IP server. A remote attacker can send a specially crafted response with an oversized number_of_packets value to cause a denial of service or execute arbitrary code.

The issue occurs because the response value is later used as the loop bound for accesses to urb->iso_frame_desc[], whose allocation size was determined by the original submission.

7) Improper input validation (CVE-ID: CVE-2026-31637)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in rxkad_decrypt_ticket() when processing a malformed RXKAD RESPONSE ticket with a non-block-aligned length. A remote attacker can send a specially crafted response ticket to cause a denial of service.

8) Integer underflow (CVE-ID: CVE-2026-31649)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to disclose sensitive information and cause memory corruption.

The vulnerability exists due to integer underflow in jumbo_frm() chain-mode implementation in the stmmac driver when processing a packet whose linear portion is smaller than the buffer size but whose total length exceeds it due to page fragments. A local user can send a specially crafted packet to disclose sensitive information and cause memory corruption.

On systems without an IOMMU, the issue can cause DMA mappings to reference kernel memory beyond the skb buffer.

9) Heap-based buffer overflow (CVE-ID: CVE-2026-31659)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in batadv_tt_prepare_tvlv_global_data() when processing an oversized global TT response from a remote originator. A remote attacker can advertise a large global TT to trigger a wrapped allocation and write past the end of the heap object to cause a denial of service or execute arbitrary code.

10) Out-of-bounds read (CVE-ID: CVE-2026-31682)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in br_nd_send when parsing neighbor discovery options from a non-linear skb. A remote attacker can send a specially crafted ICMPv6 neighbor solicitation request to cause a denial of service.

11) Improper input validation (CVE-ID: CVE-2026-31685)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in ip6t_eui64 when processing packets with an invalid MAC header. A remote attacker can send a specially crafted packet to cause a denial of service.

12) Double free (CVE-ID: CVE-2026-43011)

CWE-ID: CWE-415 - Double Free

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local attacker to cause a denial of service.

The vulnerability exists due to double free in x25_queue_rx_frame and x25_backlog_rcv when processing received x25 frames after alloc_skb failure. A local attacker can trigger the error path to cause a denial of service.

13) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-43503)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to modify the page cache of a root-owned read-only file.

The vulnerability exists due to improper state management in frag-transfer helpers in the Linux kernel networking stack when moving fragment descriptors between socket buffers. A local user can trigger packet processing through a duplicated skb path to modify the page cache of a root-owned read-only file.

One demonstrated path involves ESP input after a packet is duplicated through an nft 'dup to' rule or another nf_dup_ipv4() / xt_TEE caller.

14) Out-of-bounds read (CVE-ID: CVE-2026-43038)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in ip6_err_gen_icmpv6_unreach() when processing a forged ICMPv4 error containing a CIPSO IP option and an attacker-controlled inner IPv6 packet. A remote attacker can send a specially crafted ICMP error packet to cause a denial of service.

The issue arises because IPv4 control buffer data is reused as IPv6 control buffer data in a cloned skb, which can lead to a forged home address option offset being used during IPv6 TLV parsing.

15) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-43117)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of the superblock reference in the btrfs tracepoint event btrfs_sync_file() when overlay is used on top of btrfs. A local user can trigger file synchronization on the affected filesystem to cause a denial of service.

The issue occurs because the dentry superblock may resolve to the overlay superblock instead of the btrfs superblock.

16) Information Exposure Through Timing Discrepancy (CVE-ID: CVE-2026-43383)

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to observable timing differences in tcp-md5 MAC comparison when verifying TCP MD5 signatures. A remote attacker can measure response timing during crafted network interactions to disclose sensitive information.

17) Integer overflow (CVE-ID: CVE-2026-43407)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an integer overflow leading to an out-of-bounds read in ceph_handle_auth_reply() when processing a CEPH_MSG_AUTH_REPLY message. A remote attacker can send a specially crafted CEPH_MSG_AUTH_REPLY message to disclose sensitive information.

18) Double free (CVE-ID: CVE-2026-43414)

CWE-ID: CWE-415 - Double Free

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to double free in qla24xx_els_dcmd_iocb() error handling when releasing fcport references. A local user can trigger an error condition to cause a denial of service.

19) Improper Initialization (CVE-ID: CVE-2026-45988)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper state management in RxRPC packet processing when handling RESPONSE or CHALLENGE packets after a temporary processing failure. A remote attacker can send a sequence of crafted packets that trigger packet reprocessing to cause a denial of service.

The issue can occur when a packet is left in a partially decrypted state and then requeued for retry.

20) Integer underflow (CVE-ID: CVE-2026-46043)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an integer underflow in rxe_rcv when processing a crafted RDMA packet with a forged BTH pad field and insufficient length. A remote attacker can send a specially crafted packet to cause a denial of service.

The issue occurs because payload_size() uses the attacker-controlled pad value and ICRC size when calculating the payload length.

21) Out-of-bounds read (CVE-ID: CVE-2026-46119)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in libceph auth message processing when handling a crafted CEPH_MSG_AUTH_REPLY message. A remote attacker can send a specially crafted auth reply message to disclose sensitive information.

The issue occurs when a positive result value is misinterpreted as the size of the front segment to send, which can cause memory beyond the allocated buffer to be transmitted.

22) Race condition (CVE-ID: CVE-2026-46135)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 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/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a race condition in nvmet_tcp_handle_icreq() and target-side queue teardown when processing an initialization connection request and a connection close concurrently. A remote attacker can send an initialization connection request and immediately close the connection to cause a denial of service.

The issue can lead to a second kref_put() being issued on an already released queue.

23) Improper input validation (CVE-ID: CVE-2026-46243)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.

The vulnerability exists due to improper input validation in the cifs.spnego key description handling in fs/smb/client/cifs_spnego.c when processing userspace-created cifs.spnego keys through request_key(2) or add_key(2). A local user can supply a crafted cifs.spnego description to disclose sensitive information, modify data, or cause a denial of service.

The issue arises because authority-bearing fields such as pid, uid, creduid, and upcall_target may be treated by cifs.upcall as kernel-originating inputs.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-8615-1