PT-2026-52370 · Linux · Linux
Publicado
2026-06-25
·
Atualizado
2026-06-25
·
CVE-2026-53275
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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:
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)
[...]
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)
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