{"id":"CVE-2026-98158","summary":"ppp_async: drop the errored frame instead of resetting its headroom","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nppp_async: drop the errored frame instead of resetting its headroom\n\nppp_receive_nonmp_frame() prepends a two-byte direction tag before running\nthe pass/active BPF filters:\n\n\t*(__be16 *)skb_push(skb, 2) = htons(PPP_FILTER_INBOUND_TAG);\n\nNothing on the receive path guarantees those two bytes of headroom. The\nframe-error path in ppp_async's process_input_packet() resets a reused skb's\nheadroom to zero while claiming to restore it to a freshly allocated state -\nbut a fresh skb from dev_alloc_skb() carries NET_SKB_PAD:\n\n\terr:\n\t\tif (skb) {\n\t\t\t/* make skb appear as freshly allocated */\n\t\t\tskb_trim(skb, 0);\n\t\t\tskb_reserve(skb, - skb_headroom(skb));\n\t\t}\n\nap-\u003erpkt still points at that skb, so the next frame is reassembled into it\nwith no headroom at all. A peer that sends a bad-FCS frame followed by one\nbeginning ff 03 then leaves a single byte of headroom by the time the filter\ntag is pushed, which lands one byte below skb-\u003ehead:\n\n  skbuff: skb_under_panic: len:49 put:2 head:ffff888003c10000\n          data:ffff888003c0ffff tail:0x30 end:0x640 dev:\u003cNULL\u003e\n  kernel BUG at net/core/skbuff.c:214!\n  RIP: 0010:skb_panic+0x13e/0x230\n  Call Trace:\n   skb_push+0xbd/0x100\n   ppp_receive_nonmp_frame+0x48a/0x1d10\n   ppp_input+0x4e9/0x2f80\n   ppp_async_process+0x2a/0xe0\n   tasklet_action_common+0x20f/0x8a0\n   handle_softirqs+0x18e/0x590\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nZeroing the headroom violates the NET_SKB_PAD guarantee that dev_alloc_skb()\ngives the rest of the receive path. Besides the filter panic above, when CCP\ncompression is enabled ppp_decompress_frame() hands skb-\u003edata - 2 to\n-\u003edecompress()/-\u003eincomp(), which then reads out of bounds before skb-\u003ehead\nfor the same reason.\n\nRather than restore the headroom, drop the errored frame - as ppp_synctty\nalready does on its error path - and clear ap-\u003erpkt so the next frame is\nreassembled into a fresh skb with proper headroom. This is simpler and fixes\nboth the filter under-panic and the CCP out-of-bounds read.\n\nThe original V1 of this patch made room in ppp_receive_nonmp_frame() with\nskb_cow_head(); Eric pointed out that fixing the root cause in the transport\nis the right approach.\n\nFound by fuzzing the PPP receive path with a mutating peer on a pty; it is an\ninteresting (remote) DoS: root configures PPP, the peer supplies two crashing\nframes. The reproducer (repro-ppp-skb.c, unchanged from v1) panics in about a\nsecond, and returns cleanly with this applied.","modified":"2026-09-27T03:47:32.031022030Z","published":"2026-09-25T10:36:27.608Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98158.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c53eb14975f029abd6b26896a460f0d2aaefe6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/717137221c7d90e7c98bda9a370c9da6cbf015e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8dc5d98a16fa23c00999aecf10018c9f69fa5bf4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0fc3dabfe67caf084e7119ceb2ee23f5ad2f2da"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98158.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98158"},{"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":"6722e78c90054101e6797d5944cdc81af9897a0a"},{"fixed":"d0fc3dabfe67caf084e7119ceb2ee23f5ad2f2da"},{"fixed":"0c53eb14975f029abd6b26896a460f0d2aaefe6b"},{"fixed":"717137221c7d90e7c98bda9a370c9da6cbf015e5"},{"fixed":"8dc5d98a16fa23c00999aecf10018c9f69fa5bf4"}]}],"versions":["v7.2.6","v6.18.52","v6.12.110","v7.3-rc1","v7.2.5","v6.18.51","v6.12.109","v7.2.4","v6.18.50","v7.2.3","v6.18.49","v6.12.108","v7.2.2","v6.18.48","v6.12.107","v7.2","v7.2.1","v6.18.47","v6.12.106","v6.18.46","v6.12.105","v6.18.45","v6.12.104","v7.2-rc1","v7.2-rc5","v6.18.44","v6.12.103","v7.2-rc7","v7.2-rc2","v7.2-rc6","v7.2-rc3","v6.18.43","v6.12.102","v6.12.101","v6.18.42","v7.2-rc4","v6.18.41","v6.12.100","v6.18.40","v6.12.99","v6.12.98","v6.12.97","v6.18.39","v6.12.96","v6.18.38","v6.12.95","v6.18.37","v6.12.94","v6.18.36","v7.1","v7.1-rc1","v6.18.35","v6.12.93","v7.1-rc7","v7.1-rc6","v7.1-rc4","v7.1-rc3","v6.18.34","v6.12.92","v7.1-rc2","v7.1-rc5","v6.18.33","v6.12.91","v6.18.32","v6.12.90","v7.0","v6.18.31","v6.12.89","v6.18.30","v6.12.88","v6.18.29","v6.12.87","v6.18.28","v6.18.27","v6.12.86","v6.18.26","v6.12.85","v7.0-rc1","v6.12.84","v6.18.25","v6.18.24","v6.12.83","v6.18.23","v6.12.82","v6.18.22","v6.12.81","v7.0-rc5","v7.0-rc6","v6.18.21","v6.12.80","v7.0-rc7","v7.0-rc3","v7.0-rc4","v6.19-rc2","v6.18.20","v6.12.79","v7.0-rc2","v6.19","v6.12.78","v6.18.19","v6.12.77","v6.18.18","v6.18.17","v6.12.76","v6.18.16","v6.12.75","v6.18.15","v6.12.74","v6.18.14","v6.18.13","v6.18.12","v6.12.73","v6.18.11","v6.12.72","v6.18.10","v6.12.71","v6.12.70","v6.18.9","v6.12.69","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.18.8","v6.12.68","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.18.7","v6.12.67","v6.19-rc3","v6.18.6","v6.12.66","v6.18.5","v6.12.65","v6.18.4","v6.12.64","v6.18.3","v6.12.63","v6.18.2","v6.18.1","v6.12.62","v6.18","v6.12.61","v6.18-rc1","v6.12.60","v6.18-rc7","v6.18-rc3","v6.12.59","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.12.58","v6.18-rc4","v6.12.57","v6.12.56","v6.12.55","v6.12.54","v6.12.53","v6.12.52","v6.12.51","v6.17","v6.17-rc7","v6.12.50","v6.17-rc1","v6.17-rc2","v6.12.49","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.12.47","v6.12.46","v6.12.45","v6.12.44","v6.12.43","v6.12.42","v6.12.41","v6.16-rc6","v6.12.40","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.12.39","v6.14-rc3","v6.12.38","v6.12.37","v6.12.36","v6.12.35","v6.12.34","v6.12.33","v6.15","v6.12.32","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.12.31","v6.12.30","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.12.29","v6.12.28","v6.15-rc5","v6.12.27","v6.12.26","v6.14","v6.12.25","v6.12.24","v6.12.23","v6.12.22","v6.12.21","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.12.20","v6.14-rc4","v6.14-rc5","v6.12.19","v6.14-rc2","v6.12.18","v6.12.17","v6.12.16","v6.12.15","v6.13","v6.12.14","v6.13-rc1","v6.12.13","v6.12.12","v6.12.11","v6.13-rc6","v6.12.10","v6.13-rc7","v6.13-rc2","v6.12.9","v6.13-rc5","v6.13-rc3","v6.12.8","v6.12-rc1","v6.13-rc4","v6.12.7","v6.12.6","v6.12.5","v6.12.4","v6.12","v6.12.3","v6.12.2","v6.12.1","v6.12-rc7","v6.12-rc3","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.12-rc2","v6.11-rc1","v6.11-rc5","v6.11","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.8-rc1","v6.7-rc1","v6.8-rc7","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.7","v6.7-rc3","v6.7-rc8","v6.7-rc7","v6.7-rc6","v6.7-rc2","v6.7-rc4","v6.7-rc5","v6.6","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v6.4-rc3","v6.4-rc4","v6.4-rc2","v6.3","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.2-rc6","v6.2-rc1","v6.2","v6.2-rc2","v6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