Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: Fix use-after-free when processing MLD queries When processing an MLD query, a pointer to the multicast group address is retrieved when initially parsing the packet. This pointer is later dereferenced without being reloaded despite the fact that the skb header might have been reallocated following the pskb_may_pull() calls, leading to a use-after-free [1]. Fix by copying the multicast group address when the packet is initially parsed. [1] BUG: KASAN: slab-use-after-free in __mld_query_work (net/ipv6/mcast.c:1512) Read of size 8 at addr ffff8881154b8e90 by task kworker/4:1/118 Workqueue: mld mld_query_work Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_address_description.constprop.0 (mm/kasan/report.c:378) print_report (mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) __mld_query_work (net/ipv6/mcast.c:1512) mld_query_work (net/ipv6/mcast.c:1563) process_one_work (kernel/workqueue.c:3314) worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) </TASK> [...] Freed by task 118: kasan_save_stack (mm/kasan/common.c:57) kasan_save_track (mm/kasan/common.c:78) kasan_save_free_info (mm/kasan/generic.c:584) __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566) pskb_expand_head (net/core/skbuff.c:2335) __pskb_pull_tail (net/core/skbuff.c:2878 (discriminator 4)) __mld_query_work (net/ipv6/mcast.c:1495 (discriminator 1)) mld_query_work (net/ipv6/mcast.c:1563) process_one_work (kernel/workqueue.c:3314) worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
Product status
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before 1354271c89d0e5fbf8b3d94097ff0216695209c7
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before 53baa63a4183291574483f89583dbef13677a2c4
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before 2a613bf497029d555a7428406aa8cdb84a503cea
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before b2eb8886200b907fc71806869620609f0f4cacb0
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before 4203806f700bb44ea0b05d484d9d40044b47fb04
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before 087dbacf897c020f438f780f0a4a8aa73b6d7c5a
97300b5fdfe28c6edae926926f9467a27cf5889c (git) before 791c91dc7a9dfb2457d5e29b8216a6484b9c4b40
2.6.15
Any version before 2.6.15
5.15.210 (semver)
6.1.176 (semver)
6.6.143 (semver)
6.12.94 (semver)
6.18.36 (semver)
7.0.13 (semver)
7.1 (original_commit_for_fix)
References
git.kernel.org/...c/1354271c89d0e5fbf8b3d94097ff0216695209c7
git.kernel.org/...c/53baa63a4183291574483f89583dbef13677a2c4
git.kernel.org/...c/2a613bf497029d555a7428406aa8cdb84a503cea
git.kernel.org/...c/b2eb8886200b907fc71806869620609f0f4cacb0
git.kernel.org/...c/4203806f700bb44ea0b05d484d9d40044b47fb04
git.kernel.org/...c/087dbacf897c020f438f780f0a4a8aa73b6d7c5a
git.kernel.org/...c/791c91dc7a9dfb2457d5e29b8216a6484b9c4b40