{"id":"CVE-2026-45842","summary":"slip: reject VJ receive packets on instances with no rstate array","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nslip: reject VJ receive packets on instances with no rstate array\n\nslhc_init() accepts rslots == 0 as a valid configuration, with the\ndocumented meaning of 'no receive compression'. In that case the\nallocation loop in slhc_init() is skipped, so comp-\u003erstate stays\nNULL and comp-\u003erslot_limit stays 0 (from the kzalloc of struct\nslcompress).\n\nThe receive helpers do not defend against that configuration.\nslhc_uncompress() dereferences comp-\u003erstate[x] when the VJ header\ncarries an explicit connection ID, and slhc_remember() later assigns\ncs = &comp-\u003erstate[...] after only comparing the packet's slot number\nto comp-\u003erslot_limit. Because rslot_limit is 0, slot 0 passes the\nrange check, and the code dereferences a NULL rstate.\n\nThe configuration is reachable in-tree through PPP. PPPIOCSMAXCID\nstores its argument in a signed int, and (val \u003e\u003e 16) uses arithmetic\nshift. Passing 0xffff0000 therefore sign-extends to -1, so val2 + 1\nis 0 and ppp_generic.c ends up calling slhc_init(0, 1). Because\n/dev/ppp open is gated by ns_capable(CAP_NET_ADMIN), the whole path\nis reachable from an unprivileged user namespace. Once the malformed\nVJ state is installed, any inbound VJ-compressed or VJ-uncompressed\nframe that selects slot 0 crashes the kernel in softirq context:\n\n Oops: general protection fault, probably for non-canonical\n       address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: 0010:slhc_uncompress (drivers/net/slip/slhc.c:519)\n Call Trace:\n  \u003cTASK\u003e\n  ppp_receive_nonmp_frame (drivers/net/ppp/ppp_generic.c:2466)\n  ppp_input (drivers/net/ppp/ppp_generic.c:2359)\n  ppp_async_process (drivers/net/ppp/ppp_async.c:492)\n  tasklet_action_common (kernel/softirq.c:926)\n  handle_softirqs (kernel/softirq.c:623)\n  run_ksoftirqd (kernel/softirq.c:1055)\n  smpboot_thread_fn (kernel/smpboot.c:160)\n  kthread (kernel/kthread.c:436)\n  ret_from_fork (arch/x86/kernel/process.c:164)\n  \u003c/TASK\u003e\n\nReject the receive side on such instances instead of touching rstate.\nslhc_uncompress() falls through to its existing 'bad' label, which\nbumps sls_i_error and enters the toss state. slhc_remember() mirrors\nthat with an explicit sls_i_error increment followed by slhc_toss();\nthe sls_i_runt counter is not used here because a missing rstate is\nan internal configuration state, not a runt packet.\n\nThe transmit path is unaffected: the only in-tree caller that picks\nrslots from userspace (ppp_generic.c) still supplies tslots \u003e= 1, and\nslip.c always calls slhc_init(16, 16), so comp-\u003etstate remains valid\nand slhc_compress() continues to work.","modified":"2026-07-09T18:30:46.347158489Z","published":"2026-05-27T09:24:42.637Z","related":["SUSE-SU-2026:22099-1","SUSE-SU-2026:22108-1","SUSE-SU-2026:22112-1","SUSE-SU-2026:22117-1","SUSE-SU-2026:22127-1","SUSE-SU-2026:22137-1","SUSE-SU-2026:22433-1","SUSE-SU-2026:22458-1","SUSE-SU-2026:2450-1","SUSE-SU-2026:2482-1","SUSE-SU-2026:2591-1","openSUSE-SU-2026:10954-1","openSUSE-SU-2026:20965-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45842.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3d71c961febddd855d3ae9a519eeb96c8023f430"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4aa9eca6fda2919027dfd7a7cc69334982d89586"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72304fec672e8aac9ee7b9c475db96b37cca8d8d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b0d9e878ec2b21d99ae8051b3dda59cdb66c152"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9e1ff0eead073c4f46d874ad2526b7dda5465faf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6980e8b1a86288167f34966fa5219031999b6f1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de42f86e2cf5028a97e74c25869d1a962b13c301"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e76607442d5b73e1ba6768f501ef815bb58c2c0e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45842.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45842"},{"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":"4ab42d78e37a294ac7bc56901d563c642e03c4ae"},{"fixed":"3d71c961febddd855d3ae9a519eeb96c8023f430"},{"fixed":"72304fec672e8aac9ee7b9c475db96b37cca8d8d"},{"fixed":"4aa9eca6fda2919027dfd7a7cc69334982d89586"},{"fixed":"c6980e8b1a86288167f34966fa5219031999b6f1"},{"fixed":"de42f86e2cf5028a97e74c25869d1a962b13c301"},{"fixed":"9e1ff0eead073c4f46d874ad2526b7dda5465faf"},{"fixed":"7b0d9e878ec2b21d99ae8051b3dda59cdb66c152"},{"fixed":"e76607442d5b73e1ba6768f501ef815bb58c2c0e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"42fc512469e78939c1e419d3310c47de55bdcbb8"},{"last_affected":"df085f1cb3acd3d75408ff94f366983873bce7d2"},{"last_affected":"a1c3860d3c5fc62bd35f089bcb03f18a37242de9"},{"last_affected":"f82699de104eaf8a7ffc2849a566a94818dd8a3c"},{"last_affected":"354b254af5c1350de9586af75fe5a821b35bfb33"},{"last_affected":"5148857f5d4c812cc918cf4627f7880521e987eb"},{"last_affected":"82185755d90c8047c6f4b589c39998ff3d4ca3ad"},{"last_affected":"a50a93cc99286dc444c7e5ccc7dfb9d58c2d346d"},{"last_affected":"6b4fa561e26526c62636414d267342c945084f44"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2.6.32.70"},{"fixed":"2.6.33"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.2.75"},{"fixed":"3.3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.4.111"},{"fixed":"3.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.10.96"},{"fixed":"3.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.12.53"},{"fixed":"3.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.14.60"},{"fixed":"3.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.18.27"},{"fixed":"3.19"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.1.17"},{"fixed":"4.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.3.5"},{"fixed":"4.4"}]}],"versions":["v3.4.110","v3.18.26","v4.3.4","v4.1.16","v2.6.32.69","v3.14.59","v3.10.95","v4.3.3","v4.1.15","v3.14.58","v3.10.94","v3.18.25","v3.12.52","v3.2.74","v4.3","v4.3.2","v4.1.14","v4.3.1","v4.1.13","v3.14.57","v3.10.93","v2.6.32.68","v3.12.51","v3.2.73","v3.2.72","v3.18.24","v4.3-rc1","v4.1.12","v3.14.56","v3.10.92","v4.3-rc6","v3.12.50","v4.3-rc4","v4.3-rc2","v4.3-rc7","v3.18.23","v4.3-rc5","v4.3-rc3","v4.1.11","v3.14.55","v3.10.91","v4.1.10","v3.14.54","v3.10.90","v3.4.109","v4.2","v3.2.71","v3.18.22","v3.12.49","v4.1.9","v3.10.89","v3.14.53","v4.1.8","v4.1.7","v3.14.52","v3.10.88","v2.6.32.67","v3.12.48","v3.4.108","v3.14.51","v3.10.87","v4.1.6","v4.2-rc2","v4.2-rc1","v4.2-rc8","v3.18.21","v4.2-rc4","v3.12.47","v4.2-rc6","v4.2-rc7","v3.18.20","v4.0-rc5","v4.1.5","v3.14.50","v3.10.86","v3.2.70","v4.2-rc5",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