CVE-2026-63995— ethtool: cmis: validate start_cmd_payload_size from module
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c4f78134d45c9619339c96b4bea380b1d0699788< 63112b4515469d00008452d9cfe3fb3bf1aa2df3 | affected |
c4f78134d45c9619339c96b4bea380b1d0699788< 0696709e951be54c699664adf546d16e28974d53 | affected | ||
c4f78134d45c9619339c96b4bea380b1d0699788< a46340da00385be7fb16c62425ebc20006f2d5d8 | affected | ||
c4f78134d45c9619339c96b4bea380b1d0699788< 12c2496a71f82f63617971ca9b730dffa05cf58b | affected | ||
6.11 | affected | ||
< 6.11 | unaffected | ||
6.12.93≤ 6.12.* | unaffected | ||
6.18.35≤ 6.18.* | unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-63995
Vulnerability Information
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Vulnerability Title
ethtool: cmis: validate start_cmd_payload_size from module
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ethtool: cmis: validate start_cmd_payload_size from module The CMIS firmware update code reads start_cmd_payload_size from the module's FW Management Features CDB reply and uses it directly as the byte count for memcpy. The destination buffer is 112 bytes (ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious module (or corrupted response) can cause a OOB write later on in cmis_fw_update_start_download(). Let's error out. If modules that expect longer LPL writes actually exist we should revisit. struct cmis_cdb_start_fw_download_pl's definition has to move, no change there.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于CMIS固件更新代码未验证start_cmd_payload_size，可能导致越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-63995
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-63995 (4)
Same Patch Batch · Linux · 2026-07-19 · 430 CVEs total
| CVE-2026-63795 | 10.0 CRITICAL | 9p: avoid putting oldfid in p9_client_walk() error path |
| CVE-2026-64113 | 9.8 CRITICAL | ixgbevf: fix use-after-free in VEPA multicast source pruning |
| CVE-2026-64142 | 9.8 CRITICAL | ksmbd: close durable scavenger races against m_fp_list lookups |
| CVE-2026-63984 | 9.8 CRITICAL | ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() |
| CVE-2026-63800 | 9.8 CRITICAL | pNFS: Fix use-after-free in pnfs_update_layout() |
| CVE-2026-64136 | 9.8 CRITICAL | smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() |
| CVE-2026-63979 | 9.8 CRITICAL | net/handshake: hand off the pinned file reference to accept_doit |
| CVE-2026-63808 | 9.8 CRITICAL | exfat: fix potential use-after-free in exfat_find_dir_entry() |
| CVE-2026-63978 | 9.8 CRITICAL | net/handshake: Drain pending requests at net namespace exit |
| CVE-2026-64132 | 9.8 CRITICAL | ipv6: ioam: refresh hdr pointer before ioam6_event() |
| CVE-2026-64125 | 9.8 CRITICAL | net: bcmgenet: keep RBUF EEE/PM disabled |
| CVE-2026-64033 | 9.8 CRITICAL | RDMA/rtrs: Fix use-after-free in path file creation cleanup |
| CVE-2026-64035 | 9.8 CRITICAL | igc: set tx buffer type for SMD frames |
| CVE-2026-63825 | 9.8 CRITICAL | gcov: use atomic counter updates to fix concurrent access crashes |
| CVE-2026-64037 | 9.8 CRITICAL | wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled |
| CVE-2026-64046 | 9.8 CRITICAL | net: tls: prevent chain-after-chain in plain text SG |
| CVE-2026-64047 | 9.8 CRITICAL | net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring |
| CVE-2026-63857 | 9.8 CRITICAL | net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit() |
| CVE-2026-63888 | 9.8 CRITICAL | scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() |
| CVE-2026-64091 | 9.8 CRITICAL | batman-adv: tt: fix TOCTOU race for reported vlans |
Showing top 20 of 430 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
Same vendor: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
V. Comments for CVE-2026-63995
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