{"id":"CVE-2022-49916","summary":"rose: Fix NULL pointer dereference in rose_send_frame()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrose: Fix NULL pointer dereference in rose_send_frame()\n\nThe syzkaller reported an issue:\n\nKASAN: null-ptr-deref in range [0x0000000000000380-0x0000000000000387]\nCPU: 0 PID: 4069 Comm: kworker/0:15 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: rcu_gp srcu_invoke_callbacks\nRIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101\nCall Trace:\n \u003cIRQ\u003e\n rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255\n rose_rx_call_request+0x4c0/0x1bc0 net/rose/af_rose.c:1009\n rose_loopback_timer+0x19e/0x590 net/rose/rose_loopback.c:111\n call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474\n expire_timers kernel/time/timer.c:1519 [inline]\n __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790\n __run_timers kernel/time/timer.c:1768 [inline]\n run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803\n __do_softirq+0x1d0/0x9c8 kernel/softirq.c:571\n [...]\n \u003c/IRQ\u003e\n\nIt triggers NULL pointer dereference when 'neigh-\u003edev-\u003edev_addr' is\ncalled in the rose_send_frame(). It's the first occurrence of the\n`neigh` is in rose_loopback_timer() as `rose_loopback_neigh', and\nthe 'dev' in 'rose_loopback_neigh' is initialized sa nullptr.\n\nIt had been fixed by commit 3b3fd068c56e3fbea30090859216a368398e39bf\n(\"rose: Fix Null pointer dereference in rose_send_frame()\") ever.\nBut it's introduced by commit 3c53cd65dece47dd1f9d3a809f32e59d1d87b2b8\n(\"rose: check NULL rose_loopback_neigh-\u003eloopback\") again.\n\nWe fix it by add NULL check in rose_transmit_clear_request(). When\nthe 'dev' in 'neigh' is NULL, we don't reply the request and just\nclear it.\n\nsyzkaller don't provide repro, and I provide a syz repro like:\nr0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2)\nioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000180)={'rose0\\x00', 0x201})\nr1 = syz_init_net_socket$rose(0xb, 0x5, 0x0)\nbind$rose(r1, &(0x7f00000000c0)=@full={0xb, @dev, @null, 0x0, [@null, @null, @netrom, @netrom, @default, @null]}, 0x40)\nconnect$rose(r1, &(0x7f0000000240)=@short={0xb, @dev={0xbb, 0xbb, 0xbb, 0x1, 0x0}, @remote={0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x1}, 0x1, @netrom={0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0x0, 0x0}}, 0x1c)","modified":"2026-04-03T13:14:41.374465Z","published":"2025-05-01T14:10:56.851Z","related":["SUSE-SU-2025:01918-1","SUSE-SU-2025:01966-1","SUSE-SU-2025:02173-1","SUSE-SU-2025:02262-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49916.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/01b9c68c121847d05a4ccef68244dadf82bfa331"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e2129c67daca21043a26575108f6286c85e71f6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b46adfbee1e429f33b10a88d6c00fa88f3d6c77"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a601e5eded33bb88b8a42743db8fef3ad41dd97e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b13be5e852b03f376058027e462fad4230240891"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bbc03d74e641e824754443b908454ca9e203773e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e97c089d7a49f67027395ddf70bf327eeac2611e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f06186e5271b980bac03f5c97276ed0146ddc9b0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49916.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49916"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"76885373129b13df35ecc9b4ee86ea5840f12133"},{"fixed":"01b9c68c121847d05a4ccef68244dadf82bfa331"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b8f9de195d6303f52bae16c7911f35ac14ba7e3d"},{"fixed":"bbc03d74e641e824754443b908454ca9e203773e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0aae33feb7a56b28318f92c960a3d08d9c305984"},{"fixed":"5b46adfbee1e429f33b10a88d6c00fa88f3d6c77"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6e4b20d548fc97ecbdca15c8d96302ee5e3e6313"},{"fixed":"b13be5e852b03f376058027e462fad4230240891"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"de3deadd11987070788b48825bec4647458b988d"},{"fixed":"f06186e5271b980bac03f5c97276ed0146ddc9b0"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9cf85759e104d7e9c3fd8920a554195b715d6797"},{"fixed":"3e2129c67daca21043a26575108f6286c85e71f6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3c53cd65dece47dd1f9d3a809f32e59d1d87b2b8"},{"fixed":"a601e5eded33bb88b8a42743db8fef3ad41dd97e"},{"fixed":"e97c089d7a49f67027395ddf70bf327eeac2611e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"9197ca40fd9de265caedba70d0cb5814c4e45952"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49916.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}