| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: add overflow debug check to pull/push helpers\n\nsyzbot managed to trigger following splat:\nBUG: KASAN: use-after-free in __skb_flow_dissect+0x4a3b/0x5e50\nRead of size 1 at addr ffff888208a4000e by task a.out/2313\n[..]\n __skb_flow_dissect+0x4a3b/0x5e50\n __skb_get_hash+0xb4/0x400\n ip_tunnel_xmit+0x77e/0x26f0\n ipip_tunnel_xmit+0x298/0x410\n ..\n\nAnalysis shows that the skb has a valid ->head, but bogus ->data\npointer.\n\nskb->data gets its bogus value via the neigh layer, which does:\n\n1556 __skb_pull(skb, skb_network_offset(skb));\n\n... and the skb was already dodgy at this point:\n\nskb_network_offset(skb) returns a negative value due to an\nearlier overflow of skb->network_header (u16). __skb_pull thus\n\"adjusts\" skb->data by a huge offset, pointing outside skb->head\narea.\n\nAllow debug builds to splat when we try to pull/push more than\nINT_MAX bytes.\n\nAfter this, the syzkaller reproducer yields a more precise splat\nbefore the flow dissector attempts to read off skb->data memory:\n\nWARNING: CPU: 5 PID: 2313 at include/linux/skbuff.h:2653 neigh_connected_output+0x28e/0x400\n ip_finish_output2+0xb25/0xed0\n iptunnel_xmit+0x4ff/0x870\n ipgre_xmit+0x78e/0xbb0" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "include/linux/skbuff.h" |
| ], |
| "versions": [ |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "8af60bb2b215", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "1b2b26595bb0", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "fff05b2b004d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "219eee9c0d16", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "include/linux/skbuff.h" |
| ], |
| "versions": [ |
| { |
| "version": "6.1.86", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "custom" |
| }, |
| { |
| "version": "6.6.27", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "custom" |
| }, |
| { |
| "version": "6.8.6", |
| "lessThanOrEqual": "6.8.*", |
| "status": "unaffected", |
| "versionType": "custom" |
| }, |
| { |
| "version": "6.9", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/8af60bb2b215f478b886f1d6d302fefa7f0b917d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/1b2b26595bb09febf14c5444c873ac4ec90a5a77" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/fff05b2b004d9a8a2416d08647f3dc9068e357c8" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/219eee9c0d16f1b754a8b85275854ab17df0850a" |
| } |
| ], |
| "title": "net: skbuff: add overflow debug check to pull/push helpers", |
| "x_generator": { |
| "engine": "bippy-a5840b7849dd" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-35941", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
