SB20261001156 - Ubuntu update for linux-nvidia-6.17
Published: October 1, 2026
Breakdown by Severity
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Description
This security bulletin contains information about 27 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-53046)
CWE-ID: CWE-416 - Use After Free
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 use-after-free in ksmbd_crypt_message() when handling SMB encryption requests with an asynchronous hardware crypto engine. A remote user can send a crafted SMB request to cause a denial of service.
Exploitation requires the ksmbd server to use an asynchronous crypto engine such as the Qualcomm Crypto Engine.
2) Integer overflow (CVE-ID: CVE-2026-52914)
CWE-ID: CWE-190 - Integer overflow
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 integer overflow in the batman-adv fragment reassembly logic when processing malformed fragment chains. A local user can send malformed fragments to cause a denial of service.
3) Use of Uninitialized Variable (CVE-ID: CVE-2026-52931)
CWE-ID: CWE-457 - Use of Uninitialized Variable
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause undefined behavior.
The vulnerability exists due to use of uninitialized memory in batadv_tp_recv_ack() and batadv_tp_stop() in the tp_meter component when processing a malicious ACK packet for a tp_meter session while the node is acting as a receiver. A remote attacker can send a malicious ACK packet to cause undefined behavior.
The issue occurs when sender-only members are accessed for tp_vars in the BATADV_TP_RECEIVER role during an ongoing tp_meter session.
4) Out-of-bounds read (CVE-ID: CVE-2026-52955)
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: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 an out-of-bounds access in crush_decode() when processing a CEPH_MSG_OSD_MAP message containing a crush map with mismatched bucket algorithm fields. A remote attacker can send a specially crafted CEPH_MSG_OSD_MAP message to cause a denial of service.
5) Out-of-bounds read (CVE-ID: CVE-2026-52958)
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: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 an out-of-bounds access in osdmap_decode() when decoding a corrupted incoming osdmap message. A remote attacker can send a specially crafted osdmap message to cause a denial of service.
The issue can occur when the max_osd value in the message exceeds the actual content of the osdmap.
6) Use-after-free (CVE-ID: CVE-2026-52982)
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 rtl8150_start_xmit() when submitting a USB transmit URB and updating transmit statistics. A local user can trigger concurrent URB completion to cause a denial of service.
The issue is caused by reading skb->len after usb_submit_urb() returns, while the skb may already have been freed by the completion path on another CPU in softirq context.
7) Out-of-bounds read (CVE-ID: CVE-2026-52986)
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: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 out-of-bounds read in the nf_conntrack_sip SIP message parser when parsing non-NUL-terminated SIP packet data containing crafted port values. A remote attacker can send a specially crafted SIP packet to cause a denial of service.
The issue involves port parsing in epaddr_len(), ct_sip_parse_header_uri(), and ct_sip_parse_request(), where parsing could reach the buffer limit without a trailing character.
8) 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.
9) Out-of-bounds read (CVE-ID: CVE-2026-52999)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause incorrect logging behavior.
The vulnerability exists due to an out-of-bounds read in nf_osf_match_one() in nfnetlink_osf when processing TCP option matching across multiple fingerprints. A remote attacker can send specially crafted network traffic to cause incorrect logging behavior.
The issue is triggered when NF_OSF_LOGLEVEL_ALL is configured and matching continues after an earlier fingerprint match.
10) Stack-based buffer overflow (CVE-ID: CVE-2026-53002)
CWE-ID: CWE-121 - Stack-based buffer overflow
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 stack-based buffer overflow in the nf_nat_sip netfilter helper when processing crafted SIP/SDP messages. A remote attacker can send specially crafted network traffic to cause a denial of service.
The issue is triggered in mangle_content_len() during SIP message handling.
11) 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.
12) Use-after-free (CVE-ID: CVE-2026-53010)
CWE-ID: CWE-416 - Use After Free
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 use-after-free in smb2_open during durable reconnect handling when processing a durable reconnect request. A remote user can trigger an error condition during durable reconnect to cause a denial of service.
The issue can occur if a subsequent error happens after the durable file descriptor reference is dropped early, or if a scavenger accesses the file before smb2_open returns.
13) Out-of-bounds read (CVE-ID: CVE-2026-53043)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [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]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in dlm_match_regions() when processing a crafted DLM_QUERY_REGION network message. A remote attacker can send a specially crafted network message to disclose sensitive information.
14) Improper input validation (CVE-ID: CVE-2026-53045)
CWE-ID: CWE-20 - Improper input validation
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 input validation in the tegra124 emc timing change logic when processing memory timing settings. A local user can provide a timing configuration with an incorrect DLL state check to cause a denial of service.
15) Improper input validation (CVE-ID: CVE-2026-64531)
CWE-ID: CWE-20 - Improper input validation
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 oversized nested action attributes in openvswitch flow action construction when processing user-supplied openvswitch nested action attributes. A local user can supply specially crafted nested CLONE or CT actions to cause a denial of service.
The issue occurs because a generated nested action attribute can be closed with a truncated nla_len, causing later dump or teardown operations to walk a structurally different action stream than the one that was validated.
16) Improper locking (CVE-ID: CVE-2026-53049)
CWE-ID: CWE-667 - Improper Locking
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 locking in gfs2_logd() and log flushing functions in the gfs2 log subsystem when handling concurrent transactions. A local user can trigger concurrent log flush activity to cause a denial of service.
17) Use-after-free (CVE-ID: CVE-2026-53055)
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 hisilicon sec2 crypto driver when processing packet transmission completions under heavy load. A local user can trigger concurrent packet transmission activity to cause a denial of service.
The issue occurs when hardware completes packet processing and the request memory is freed before the transmission function finishes using it.
18) Off-by-one (CVE-ID: CVE-2026-53088)
CWE-ID: CWE-193 - Off-by-one Error
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 off-by-one error in bcmgenet_put_txcb in the bcmgenet network driver when handling transmit control block pointer rewinding. A local user can trigger the flawed pointer handling to cause a denial of service.
19) Out-of-bounds read (CVE-ID: CVE-2026-53151)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/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 an out-of-bounds read in rxrpc_input_soft_acks() when parsing the SACK table from a fragmented UDP packet. A remote attacker can send a deliberately fragmented packet to cause a denial of service.
The issue affects AF_RXRPC extended ACK parsing, and exploitation likely requires a deliberately pre-generated fragmented packet.
20) Use-after-free (CVE-ID: CVE-2026-53175)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/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 inet_frag_queue_flush() and fragment reassembly handling when processing fragmented network packets during network namespace teardown. A remote attacker can send fragmented packets and trigger reuse of a flushed fragment queue to cause a denial of service.
IPv6, nf_conntrack_reasm6, and 6lowpan reassembly share the same affected flush path.
21) Use-after-free (CVE-ID: CVE-2026-53215)
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 attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in the mvpp2 RX buffer handling in drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c when processing received packets through XDP or skb paths. A local attacker can trigger packet processing that returns a retired buffer to the BM pool to cause a denial of service.
Hardware may DMA into memory that is no longer owned by the RX ring after the buffer has been recycled, redirected, queued for XDP_TX, or freed.
22) Out-of-bounds write (CVE-ID: CVE-2026-53216)
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 corrupt memory or cause a denial of service.
The vulnerability exists due to an out-of-bounds write in the mvpp2 XDP receive path when processing packets with XDP tail adjustment on short RX buffers. A local user can trigger bpf_xdp_adjust_tail() on a packet to corrupt memory or cause a denial of service.
The issue occurs because the XDP frame size is initialized larger than the actual backing buffer size for short BM pool buffers.
23) Out-of-bounds read (CVE-ID: CVE-2026-53224)
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: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 out-of-bounds read in SCTP cookie processing in sctp_unpack_cookie(), sctp_process_init(), and sctp_raw_to_bind_addrs() when handling a malformed COOKIE_ECHO containing a truncated embedded INIT chunk or malformed address parameters. A remote attacker can send a specially crafted COOKIE_ECHO to cause a denial of service.
When cookie authentication is disabled, an oversized raw address list length can also be used to trigger the out-of-bounds read condition.
24) Out-of-bounds read (CVE-ID: CVE-2026-53246)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information or cause memory corruption.
The vulnerability exists due to an out-of-bounds read in sctp_unpack_cookie() and cached peer INIT chunk processing when processing a crafted COOKIE_ECHO chunk. A remote attacker can send a specially crafted COOKIE_ECHO chunk with an inflated cached INIT chunk length to disclose sensitive information or cause memory corruption.
The issue occurs in a listening SCTP server while walking parameters from the cached peer INIT chunk embedded after the cookie.
25) Use-after-free (CVE-ID: CVE-2026-53247)
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 mtk_eth_soc driver metadata dst teardown path when tearing down the device while packets still hold a non-refcounted pointer to metadata_dst. A local user can trigger the teardown condition to cause a denial of service.
The issue arises in the RX path because skb_dst_set_noref() requires RCU read-side protection and the destination object must remain valid until all RCU readers have completed.
26) Use-after-free (CVE-ID: CVE-2026-53260)
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 race condition in reqsk_queue_hash_req() in net/ipv4/inet_connection_sock.c when handling TCP request socket timer setup and reference count initialization on PREEMPT_RT systems. A local user can trigger the race to cause a denial of service.
Exploitation requires a PREEMPT_RT-enabled kernel.
27) Out-of-bounds read (CVE-ID: CVE-2026-53309)
CWE-ID: CWE-125 - Out-of-bounds read
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 disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to an out-of-bounds read in dlm_match_regions() when comparing local and remote regions. A remote attacker can trigger the vulnerable region comparison to disclose sensitive information, modify data, or cause a denial of service.
Remediation
Install update from vendor's website.