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CVE-2024-26752— l2tp: pass correct message length to ip6_append_data

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于存在错误的消息长度传递。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1040 · Network Sniffing

Affected Version Matrix 27

VendorProduct Version RangeStatus
Linux Linux 559d697c5d072593d22b3e0bd8b8081108aeaf59< 4c3ce64bc9d36ca9164dd6c77ff144c121011aae affected
1fc793d68d50dee4782ef2e808913d5dd880bcc6< c1d3a84a67db910ce28a871273c992c3d7f9efb5 affected
96b2e1090397217839fcd6c9b6d8f5d439e705ed< dcb4d14268595065c85dc5528056713928e17243 affected
cd1189956393bf850b2e275e37411855d3bd86bb< 0da15a70395182ee8cb75716baf00dddc0bea38d affected
f6a7182179c0ed788e3755ee2ed18c888ddcc33f< 13cd1daeea848614e585b2c6ecc11ca9c8ab2500 affected
9d4c75800f61e5d75c1659ba201b6c0c7ead3070< 804bd8650a3a2bf3432375f8c97d5049d845ce56 affected
9d4c75800f61e5d75c1659ba201b6c0c7ead3070< 83340c66b498e49353530e41542500fc8a4782d6 affected
9d4c75800f61e5d75c1659ba201b6c0c7ead3070< 359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79 affected
… +19 more rows
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I. Basic Information for CVE-2024-26752

Vulnerability Information
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Vulnerability Title
l2tp: pass correct message length to ip6_append_data
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: l2tp: pass correct message length to ip6_append_data l2tp_ip6_sendmsg needs to avoid accounting for the transport header twice when splicing more data into an already partially-occupied skbuff. To manage this, we check whether the skbuff contains data using skb_queue_empty when deciding how much data to append using ip6_append_data. However, the code which performed the calculation was incorrect: ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0; ...due to C operator precedence, this ends up setting ulen to transhdrlen for messages with a non-zero length, which results in corrupted packets on the wire. Add parentheses to correct the calculation in line with the original intent.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于存在错误的消息长度传递。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 559d697c5d072593d22b3e0bd8b8081108aeaf59 ~ 4c3ce64bc9d36ca9164dd6c77ff144c121011aae -
Linux Linux 6.6 -

II. Public POCs for CVE-2024-26752

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III. Intelligence Information for CVE-2024-26752

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Mailing List Discussions for CVE-2024-26752 (2)

Other References for CVE-2024-26752 (7)

Same Patch Batch · Linux · 2024-04-03 · 94 CVEs total

CVE-2024-26760 9.8 CRITICAL scsi: target: pscsi: Fix bio_put() for error case
CVE-2024-26689 8.8 HIGH ceph: prevent use-after-free in encode_cap_msg()
CVE-2024-26779 8.8 HIGH wifi: mac80211: fix race condition on enabling fast-xmit
CVE-2024-26692 8.3 HIGH smb: Fix regression in writes when non-standard maximum write size negotiated
CVE-2024-26736 8.1 HIGH afs: Increase buffer size in afs_update_volume_status()
CVE-2024-26737 7.8 HIGH bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel
CVE-2024-26739 7.8 HIGH net/sched: act_mirred: don't override retval if we already lost the skb
CVE-2023-52637 7.8 HIGH can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)
CVE-2024-26728 7.8 HIGH drm/amd/display: fix null-pointer dereference on edid reading
CVE-2024-26748 7.8 HIGH usb: cdns3: fix memory double free when handle zero packet
CVE-2024-26712 7.8 HIGH powerpc/kasan: Fix addr error caused by page alignment
CVE-2024-26718 7.8 HIGH dm-crypt, dm-verity: disable tasklets
CVE-2024-26759 7.8 HIGH mm/swap: fix race when skipping swapcache
CVE-2024-26762 7.8 HIGH cxl/pci: Skip to handle RAS errors if CXL.mem device is detached
CVE-2024-26706 7.8 HIGH parisc: Fix random data corruption from exception handler
CVE-2024-26704 7.8 HIGH ext4: fix double-free of blocks due to wrong extents moved_len
CVE-2024-26766 7.8 HIGH IB/hfi1: Fix sdma.h tx->num_descs off-by-one error
CVE-2024-26773 7.8 HIGH ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
CVE-2024-26697 7.8 HIGH nilfs2: fix data corruption in dsync block recovery for small block sizes
CVE-2024-26699 7.8 HIGH drm/amd/display: Fix array-index-out-of-bounds in dcn35_clkmgr

Showing top 20 of 94 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26752

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