CVE-2022-49904

In the Linux kernel, the following vulnerability has been resolved: net, neigh: Fix null-ptr-deref in neigh_table_clear() When IPv6 module gets initialized but hits an error in the middle, kenel panic with: KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception When ipv6 initialization fails, it will try to cleanup and calls: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref. Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0	Patch
https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051	Patch
https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1	Patch
https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458	Patch
https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c	Patch
https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe	Patch
https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad	Patch

Configurations

Configuration 1 (hide)

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:6.1:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::

History

07 May 2025, 13:30

Type	Values Removed	Values Added
CWE		CWE-476
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
First Time		Linux linux Kernel Linux
References	~~() https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 -~~	() https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 - Patch
References	~~() https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051 -~~	() https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051 - Patch
References	~~() https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1 -~~	() https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1 - Patch
References	~~() https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458 -~~	() https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458 - Patch
References	~~() https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c -~~	() https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c - Patch
References	~~() https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe -~~	() https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe - Patch
References	~~() https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad -~~	() https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad - Patch
CPE		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.1:rc1:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc2:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::

02 May 2025, 13:52

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net, neigh: Fix null-ptr-deref en neigh_table_clear() Cuando se inicializa un módulo IPv6 pero se produce un error en el medio, kenel entra en pánico con: KASAN: null-ptr-deref en el rango [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Seguimiento de llamadas: neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Pánico del kernel - no sincroniza: Excepción fatal Cuando falla la inicialización de ipv6, intentará limpiar y llamará a: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) activa null-ptr-deref. Corríjalo pasando NULL a pneigh_queue_purge() en neigh_ifdown() si dev es NULL, para que el kernel no entre en pánico inmediatamente.

01 May 2025, 15:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-05-01 15:16

Updated : 2025-05-07 13:30

NVD link : CVE-2022-49904

Mitre link : CVE-2022-49904

CVE.ORG link : CVE-2022-49904

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-476

NULL Pointer Dereference

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Seguimiento de llamadas: neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... P\u00e1nico del kernel - no sincroniza: Excepci\u00f3n fatal Cuando falla la inicializaci\u00f3n de ipv6, intentar\u00e1 limpiar y llamar\u00e1 a: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) activa null-ptr-deref. Corr\u00edjalo pasando NULL a pneigh_queue_purge() en neigh_ifdown() si dev es NULL, para que el kernel no entre en p\u00e1nico inmediatamente."}], "lastModified": "2025-05-07T13:30:34.307", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ACF1943E-656C-440D-81D9-3F3FA23D23B2", "versionEndExcluding": "4.14.299", "versionStartIncluding": "4.14.292"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D2847A4B-743C-483A-AFAA-5F8246CB36C0", "versionEndExcluding": "4.19.265", "versionStartIncluding": "4.19.257"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4E471077-A8B4-46CA-B708-055F12D45483", "versionEndExcluding": "5.4.224", "versionStartIncluding": "5.4.212"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D090B338-9D25-43EA-9557-2C221E1E3C93", "versionEndExcluding": "5.10.154", "versionStartIncluding": "5.10.141"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AD95DA02-3B8E-44E0-B8B1-CF0DAB5377CD", "versionEndExcluding": "5.15.78", "versionStartIncluding": "5.15.65"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "60F95F94-9031-4778-B2D0-E7A8286B58D1", "versionEndExcluding": "6.0.8", "versionStartIncluding": "5.19.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}

5.5 /10