Description · from the CVE record
In the Linux kernel, the following vulnerability has been resolved:
net/x25: Fix potential double free of skb
When alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at
line 48 and returns 1 (error).
This error propagates back through the call chain:
x25_queue_rx_frame returns 1
|
v
x25_state3_machine receives the return value 1 and takes the else
branch at line 278, setting queued=0 and returning 0
|
v
x25_process_rx_frame returns queued=0
|
v
x25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb)
again
This would free the same skb twice. Looking at x25_backlog_rcv:
net/x25/x25_in.c:x25_backlog_rcv() {
...
queued = x25_process_rx_frame(sk, skb);
...
if (!queued)
kfree_skb(skb);
}
Affected
ProductAffectedFixed inSource
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e95d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3f5e3005984645bf5bd129c6b13149879580b1fb3f5e3005984645bf5bd129c6b13149879580b1fbCNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f782dd382203b2a8c4552a628431b7de65a19a7bf782dd382203b2a8c4552a628431b7de65a19a7bCNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 524371398d8463ea7e101fce2cbf3915645d1730524371398d8463ea7e101fce2cbf3915645d1730CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < fa1dbc93530b34fab0da9862426fe9c918c74dc0fa1dbc93530b34fab0da9862426fe9c918c74dc0CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c87dd137c0dad07cc55f98181ff380b0c23d2878c87dd137c0dad07cc55f98181ff380b0c23d2878CNA
Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d10a26aa4d072320530e6968ef945c8c575edf61d10a26aa4d072320530e6968ef945c8c575edf61CNA
Linux2.6.12–CNA
SIMATIC S7-1500 CPU 1518-4 PN/DP MFPV3.1.6–siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFPV3.1.5–siemens-SADP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFPV3.1.7–siemens-SADP
by Kastro