CVE-2024-56643

dccp: Fix memory leak in dccp_feat_change_recv

Published Dec 27, 2024 CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed

Description

In the Linux kernel, the following vulnerability has been resolved:

dccp: Fix memory leak in dccp_feat_change_recv

If dccp_feat_push_confirm() fails after new value for SP feature was accepted
without reconciliation ('entry == NULL' branch), memory allocated for that value
with dccp_feat_clone_sp_val() is never freed.

Here is the kmemleak stack for this:

unreferenced object 0xffff88801d4ab488 (size 8):
comm "syz-executor310", pid 1127, jiffies 4295085598 (age 41.666s)
hex dump (first 8 bytes):
01 b4 4a 1d 80 88 ff ff ..J.....
backtrace:
[<00000000db7cabfe>] kmemdup+0x23/0x50 mm/util.c:128
[<0000000019b38405>] kmemdup include/linux/string.h:465 [inline]
[<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:371 [inline]
[<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:367 [inline]
[<0000000019b38405>] dccp_feat_change_recv net/dccp/feat.c:1145 [inline]
[<0000000019b38405>] dccp_feat_parse_options+0x1196/0x2180 net/dccp/feat.c:1416
[<00000000b1f6d94a>] dccp_parse_options+0xa2a/0x1260 net/dccp/options.c:125
[<0000000030d7b621>] dccp_rcv_state_process+0x197/0x13d0 net/dccp/input.c:650
[<000000001f74c72e>] dccp_v4_do_rcv+0xf9/0x1a0 net/dccp/ipv4.c:688
[<00000000a6c24128>] sk_backlog_rcv include/net/sock.h:1041 [inline]
[<00000000a6c24128>] __release_sock+0x139/0x3b0 net/core/sock.c:2570
[<00000000cf1f3a53>] release_sock+0x54/0x1b0 net/core/sock.c:3111
[<000000008422fa23>] inet_wait_for_connect net/ipv4/af_inet.c:603 [inline]
[<000000008422fa23>] __inet_stream_connect+0x5d0/0xf70 net/ipv4/af_inet.c:696
[<0000000015b6f64d>] inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:735
[<0000000010122488>] __sys_connect_file+0x15c/0x1a0 net/socket.c:1865
[<00000000b4b70023>] __sys_connect+0x165/0x1a0 net/socket.c:1882
[<00000000f4cb3815>] __do_sys_connect net/socket.c:1892 [inline]
[<00000000f4cb3815>] __se_sys_connect net/socket.c:1889 [inline]
[<00000000f4cb3815>] __x64_sys_connect+0x6e/0xb0 net/socket.c:1889
[<00000000e7b1e839>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
[<0000000055e91434>] entry_SYSCALL_64_after_hwframe+0x67/0xd1

Clean up the allocated memory in case of dccp_feat_push_confirm() failure
and bail out with an error reset code.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Analysis

No analysis available yet

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< 623be080ab3c13d71570bd32f7202a8efa8e2252
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< c99507fff94b926fc92279c92d80f229c91cb85d
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< bc3d4423def1a9412a0ae454cb4477089ab79276
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< 6ff67909ee2ffad911e3122616df41dee23ff4f6
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< d3ec686a369fae5034303061f003cd3f94ddfd23
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< 9ee68b0f23706a77f53c832457b9384178b76421
`e77b8363b2ea7c0d89919547c1a8b0562f298b57`	affected	< 22be4727a8f898442066bcac34f8a1ad0bc72e14

Linux

affected

Version	Status	Constraints
`2.6.29`	affected	—
`0`	unaffected	< 2.6.29
`5.4.287`	unaffected	≤ 5.4.*
`5.10.231`	unaffected	≤ 5.10.*
`5.15.174`	unaffected	≤ 5.15.*
`6.1.120`	unaffected	≤ 6.1.*
`6.6.66`	unaffected	≤ 6.6.*
`6.12.5`	unaffected	≤ 6.12.*
`6.13`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.13:rc1::::::

No data.

No data available yet.

Remediation

No remediation available yet

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4075-1	linux security update
Debian DLA	DLA-4076-1	linux-6.1 security update
EUVD	EUVD-2024-53291	In the Linux kernel, the following vulnerability has been resolved: dccp: Fix memory leak in dccp_feat_change_recv If dccp_feat_push_confirm() fails after new value for SP feature was accepted without reconciliation ('entry == NULL' branch), memory allocated for that value with dccp_feat_clone_sp_val() is never freed. Here is the kmemleak stack for this: unreferenced object 0xffff88801d4ab488 (size 8): comm "syz-executor310", pid 1127, jiffies 4295085598 (age 41.666s) hex dump (first 8 bytes): 01 b4 4a 1d 80 88 ff ff ..J..... backtrace: [<00000000db7cabfe>] kmemdup+0x23/0x50 mm/util.c:128 [<0000000019b38405>] kmemdup include/linux/string.h:465 [inline] [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:371 [inline] [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:367 [inline] [<0000000019b38405>] dccp_feat_change_recv net/dccp/feat.c:1145 [inline] [<0000000019b38405>] dccp_feat_parse_options+0x1196/0x2180 net/dccp/feat.c:1416 [<00000000b1f6d94a>] dccp_parse_options+0xa2a/0x1260 net/dccp/options.c:125 [<0000000030d7b621>] dccp_rcv_state_process+0x197/0x13d0 net/dccp/input.c:650 [<000000001f74c72e>] dccp_v4_do_rcv+0xf9/0x1a0 net/dccp/ipv4.c:688 [<00000000a6c24128>] sk_backlog_rcv include/net/sock.h:1041 [inline] [<00000000a6c24128>] __release_sock+0x139/0x3b0 net/core/sock.c:2570 [<00000000cf1f3a53>] release_sock+0x54/0x1b0 net/core/sock.c:3111 [<000000008422fa23>] inet_wait_for_connect net/ipv4/af_inet.c:603 [inline] [<000000008422fa23>] __inet_stream_connect+0x5d0/0xf70 net/ipv4/af_inet.c:696 [<0000000015b6f64d>] inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:735 [<0000000010122488>] __sys_connect_file+0x15c/0x1a0 net/socket.c:1865 [<00000000b4b70023>] __sys_connect+0x165/0x1a0 net/socket.c:1882 [<00000000f4cb3815>] __do_sys_connect net/socket.c:1892 [inline] [<00000000f4cb3815>] __se_sys_connect net/socket.c:1889 [inline] [<00000000f4cb3815>] __x64_sys_connect+0x6e/0xb0 net/socket.c:1889 [<00000000e7b1e839>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 [<0000000055e91434>] entry_SYSCALL_64_after_hwframe+0x67/0xd1 Clean up the allocated memory in case of dccp_feat_push_confirm() failure and bail out with an error reset code. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Ubuntu USN	USN-7379-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7379-2	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-7380-1	Linux kernel (Low Latency) vulnerabilities
Ubuntu USN	USN-7381-1	Linux kernel (Low Latency) vulnerabilities
Ubuntu USN	USN-7382-1	Linux kernel (OEM) vulnerabilities
Ubuntu USN	USN-7387-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7387-2	Linux kernel (FIPS) vulnerabilities
Ubuntu USN	USN-7387-3	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-7388-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7389-1	Linux kernel (NVIDIA Tegra) vulnerabilities
Ubuntu USN	USN-7390-1	Linux kernel (Xilinx ZynqMP) vulnerabilities
Ubuntu USN	USN-7391-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7392-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7392-2	Linux kernel vulnerabilities
Ubuntu USN	USN-7392-3	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-7392-4	Linux kernel (AWS FIPS) vulnerabilities
Ubuntu USN	USN-7393-1	Linux kernel (FIPS) vulnerabilities
Ubuntu USN	USN-7401-1	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-7407-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-7413-1	Linux kernel (IoT) vulnerabilities
Ubuntu USN	USN-7421-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-7449-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7449-2	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-7450-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7451-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7452-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7453-1	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-7458-1	Linux kernel (IBM) vulnerabilities
Ubuntu USN	USN-7459-1	Linux kernel (Intel IoTG) vulnerabilities
Ubuntu USN	USN-7459-2	Linux kernel (GCP) vulnerabilities
Ubuntu USN	USN-7463-1	Linux kernel (IBM) vulnerabilities
Ubuntu USN	USN-7468-1	Linux kernel (Azure, N-Series) vulnerabilities
Ubuntu USN	USN-7523-1	Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN	USN-7524-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-7539-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-7540-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-8529-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8530-1	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-8548-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8635-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8529-2	Linux kernel vulnerabilities
Ubuntu USN	USN-8530-2	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-8548-2	Linux kernel vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.229% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://git.kernel.org/stable/c/22be4727a8f898442066bcac34f8a1ad0bc72e14
https://git.kernel.org/stable/c/623be080ab3c13d71570bd32f7202a8efa8e2252
https://git.kernel.org/stable/c/6ff67909ee2ffad911e3122616df41dee23ff4f6
https://git.kernel.org/stable/c/9ee68b0f23706a77f53c832457b9384178b76421
https://git.kernel.org/stable/c/bc3d4423def1a9412a0ae454cb4477089ab79276
https://git.kernel.org/stable/c/c99507fff94b926fc92279c92d80f229c91cb85d
https://git.kernel.org/stable/c/d3ec686a369fae5034303061f003cd3f94ddfd23
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
https://lore.kernel.org/linux-cve-announce/2024122737-CVE-2024-56643-8470@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-56643
https://www.cve.org/CVERecord?id=CVE-2024-56643

History

Nov 3, 2025 9:30 PM Added references View changes

Type	Values Removed	Values Added
References		https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Apr 17, 2025 8:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}` cvssV3_1 `{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}`

Feb 13, 2025 12:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	threat_severity `Low`	threat_severity `Moderate`

Jan 6, 2025 5:30 PM First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Weaknesses		CWE-401
CPEs		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.13:rc1::::::
Vendors & Products		Linux Linux linux Kernel

Dec 31, 2024 2:30 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2024122737-CVE-2024-56643-8470@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2024-56643 https://www.cve.org/CVERecord?id=CVE-2024-56643
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Low`

Dec 27, 2024 3:15 PM Description updated. Title updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: dccp: Fix memory leak in dccp_feat_change_recv If dccp_feat_push_confirm() fails after new value for SP feature was accepted without reconciliation ('entry == NULL' branch), memory allocated for that value with dccp_feat_clone_sp_val() is never freed. Here is the kmemleak stack for this: unreferenced object 0xffff88801d4ab488 (size 8): comm "syz-executor310", pid 1127, jiffies 4295085598 (age 41.666s) hex dump (first 8 bytes): 01 b4 4a 1d 80 88 ff ff ..J..... backtrace: [<00000000db7cabfe>] kmemdup+0x23/0x50 mm/util.c:128 [<0000000019b38405>] kmemdup include/linux/string.h:465 [inline] [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:371 [inline] [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:367 [inline] [<0000000019b38405>] dccp_feat_change_recv net/dccp/feat.c:1145 [inline] [<0000000019b38405>] dccp_feat_parse_options+0x1196/0x2180 net/dccp/feat.c:1416 [<00000000b1f6d94a>] dccp_parse_options+0xa2a/0x1260 net/dccp/options.c:125 [<0000000030d7b621>] dccp_rcv_state_process+0x197/0x13d0 net/dccp/input.c:650 [<000000001f74c72e>] dccp_v4_do_rcv+0xf9/0x1a0 net/dccp/ipv4.c:688 [<00000000a6c24128>] sk_backlog_rcv include/net/sock.h:1041 [inline] [<00000000a6c24128>] __release_sock+0x139/0x3b0 net/core/sock.c:2570 [<00000000cf1f3a53>] release_sock+0x54/0x1b0 net/core/sock.c:3111 [<000000008422fa23>] inet_wait_for_connect net/ipv4/af_inet.c:603 [inline] [<000000008422fa23>] __inet_stream_connect+0x5d0/0xf70 net/ipv4/af_inet.c:696 [<0000000015b6f64d>] inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:735 [<0000000010122488>] __sys_connect_file+0x15c/0x1a0 net/socket.c:1865 [<00000000b4b70023>] __sys_connect+0x165/0x1a0 net/socket.c:1882 [<00000000f4cb3815>] __do_sys_connect net/socket.c:1892 [inline] [<00000000f4cb3815>] __se_sys_connect net/socket.c:1889 [inline] [<00000000f4cb3815>] __x64_sys_connect+0x6e/0xb0 net/socket.c:1889 [<00000000e7b1e839>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 [<0000000055e91434>] entry_SYSCALL_64_after_hwframe+0x67/0xd1 Clean up the allocated memory in case of dccp_feat_push_confirm() failure and bail out with an error reset code. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Title		dccp: Fix memory leak in dccp_feat_change_recv
References		https://git.kernel.org/stable/c/22be4727a8f898442066bcac34f8a1ad0bc72e14 https://git.kernel.org/stable/c/623be080ab3c13d71570bd32f7202a8efa8e2252 https://git.kernel.org/stable/c/6ff67909ee2ffad911e3122616df41dee23ff4f6 https://git.kernel.org/stable/c/9ee68b0f23706a77f53c832457b9384178b76421 https://git.kernel.org/stable/c/bc3d4423def1a9412a0ae454cb4477089ab79276 https://git.kernel.org/stable/c/c99507fff94b926fc92279c92d80f229c91cb85d https://git.kernel.org/stable/c/d3ec686a369fae5034303061f003cd3f94ddfd23