netrom: Fix a memory leak in nr_heartbeat_expiry()

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Summary

CVECVE-2024-41006
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-07-12 13:15:21 UTC
Updated2026-05-12 12:17:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netrom: Fix a memory leak in nr_heartbeat_expiry() syzbot reported a memory leak in nr_create() [0]. Commit 409db27e3a2e ("netrom: Fix use-after-free of a listening socket.") added sock_hold() to the nr_heartbeat_expiry() function, where a) a socket has a SOCK_DESTROY flag or b) a listening socket has a SOCK_DEAD flag. But in the case "a," when the SOCK_DESTROY flag is set, the file descriptor has already been closed and the nr_release() function has been called. So it makes no sense to hold the reference count because no one will call another nr_destroy_socket() and put it as in the case "b." nr_connect nr_establish_data_link nr_start_heartbeat nr_release switch (nr->state) case NR_STATE_3 nr->state = NR_STATE_2 sock_set_flag(sk, SOCK_DESTROY); nr_rx_frame nr_process_rx_frame switch (nr->state) case NR_STATE_2 nr_state2_machine() nr_disconnect() nr_sk(sk)->state = NR_STATE_0 sock_set_flag(sk, SOCK_DEAD) nr_heartbeat_expiry switch (nr->state) case NR_STATE_0 if (sock_flag(sk, SOCK_DESTROY) || (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) sock_hold() // ( !!! ) nr_destroy_socket() To fix the memory leak, let's call sock_hold() only for a listening socket. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller. [0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a31caf5779ace8fa98b0d454133808e082ee7a1b d616876256b38ecf9a1a1c7d674192c5346bc69c git Not specified
CNA Linux Linux affected fe9b9e621cebe6b7e83f7e954c70f8bb430520e5 e07a9c2a850cdebf625e7a1b8171bd23a8554313 git Not specified
CNA Linux Linux affected 7de16d75b20ab13b75a7291f449a1b00090edfea 5391f9db2cab5ef1cb411be1ab7dbec728078fba git Not specified
CNA Linux Linux affected d2d3ab1b1de3302de2c85769121fd4f890e47ceb 280cf1173726a7059b628c610c71050d5c0b6937 git Not specified
CNA Linux Linux affected 51e394c6f81adbfe7c34d15f58b3d4d44f144acf a02fd5d775cf9787ee7698c797e20f2fa13d2e2b git Not specified
CNA Linux Linux affected 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9 b6ebe4fed73eedeb73f4540f8edc4871945474c8 git Not specified
CNA Linux Linux affected 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9 d377f5a28332954b19e373d36823e59830ab1712 git Not specified
CNA Linux Linux affected 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9 0b9130247f3b6a1122478471ff0e014ea96bb735 git Not specified
CNA Linux Linux affected e666990abb2e42dd4ba979b4706280a3664cfae7 git Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 4.19.317 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.279 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.221 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.162 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.96 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.36 6.6.* semver Not specified
CNA Linux Linux unaffected 6.9.7 6.9.* semver Not specified
CNA Linux Linux unaffected 6.10 * original_commit_for_fix Not specified
ADP Siemens RUGGEDCOM RST2428P affected V3.1 custom Not specified
ADP Siemens RUGGEDCOM RST2428P unaffected * custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family unaffected * custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family unaffected * custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family affected V3.1 custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family unaffected * custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5391f9db2cab5ef1cb411be1ab7dbec728078fba af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
git.kernel.org/stable/c/0b9130247f3b6a1122478471ff0e014ea96bb735 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
git.kernel.org/stable/c/e07a9c2a850cdebf625e7a1b8171bd23a8554313 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/a02fd5d775cf9787ee7698c797e20f2fa13d2e2b af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
git.kernel.org/stable/c/d377f5a28332954b19e373d36823e59830ab1712 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
cert-portal.siemens.com/productcert/html/ssa-613116.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/280cf1173726a7059b628c610c71050d5c0b6937 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
cert-portal.siemens.com/productcert/html/ssa-355557.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/b6ebe4fed73eedeb73f4540f8edc4871945474c8 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/d616876256b38ecf9a1a1c7d674192c5346bc69c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch
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